Re: [FFmpeg-user] Trying to stream to rtmp from my rsp4 and a GoPro

[Christian Ebert]

* Mark Filipak (ffmpeg) on Monday, February 15, 2021 at 21:02:33 -0500:

On 02/15/2021 06:29 PM, Mike Soultanian wrote:
-bigsnip-

You can - easily - let the audio stream start with 0 but the problem
is that the result will not play in-sync, see the setps documentation.


What is 'setps'? A filter, a protocol, a muxer, what?


A typo for 'setpts'.


I've searched through all the docs and can't find it.


Because the typo is not in the docs ;-)

https://ffmpeg.org/ffmpeg-filters.html#setpts_002c-asetpts

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Re: [FFmpeg-user] Trying to stream to rtmp from my rsp4 and a GoPro

[Mark Filipak (ffmpeg)]

On 02/15/2021 06:29 PM, Mike Soultanian wrote:
-bigsnip-

You can - easily - let the audio stream start with 0 but the problem
is that the result will not play in-sync, see the setps documentation.


What is 'setps'? A filter, a protocol, a muxer, what? I've searched through all the docs and can't 
find it.


Thanks!

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Re: [FFmpeg-user] Trying to stream to rtmp from my rsp4 and a GoPro

[Mike Soultanian]

On 2/15/2021 5:47 PM, Chris Angelico wrote:


Not sure if it's the same cause, but a friend of mine has a similar
setup, and she had the same sort of problem when streaming on Twitch.
Her solution was to set it to 4k 30fps and select recording video mode
(without actually recording).

ChrisA


Hey Chris,

I was having problems well before even trying to stream to Twitch - I 
was just trying to capture (record) audio and video being captured from 
my HDMI output and it just wouldn't work.  Had I just unplugged my USB 
capture device, it would have started work :/


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Re: [FFmpeg-user] Trying to stream to rtmp from my rsp4 and a GoPro

[Chris Angelico]

On Tue, Feb 16, 2021 at 10:35 AM Mike Soultanian  wrote:
>
> Well.. that was extremely frustrating. I've seriously been going at this
> for probably 16 hours, scouring the net for documentation and trying
> other people's tutorials, wondering why my setup wasn't working as well
> as all the examples that described all the cool stuff you could do with
> ffmpeg.  It was only after I purchased another capture card (Elgato Cam
> Link 4k) that I found I found this article when searching for *ffmpeg
> elgato cam link* and found this page:
>
> https://blog.eigenvalue.net/ffmpeg-elgato-camlink-4k/
>
> What was so crucial was one little tidbit towards the end of the page
> where the author writes (referring to running the ffmpeg command):
>
> > Unfortunately, most of the time it will get stuck after two frames.
> > After some random experimentation, I noticed that unplugging the
> > device allowed me to record once, most of the time. I think that it is
> > due to syncing the audio / video stream. The video source seems to
> > request key frames doesn't get the expected data afterwards. Or
> > something else.
> >
>
> This was *exactly* the behavior I was running into, but I had no idea
> that I was actually running into that particular issue!  This whole time
> I had a gut feeling that there was somewhat inconsistent behavior
> (sometimes it would seem to work and then on the next run with the same
> settings it would have very low FPS), but I'm a total newbie to this so
> I didn't know if this was just normal behavior or something was wrong.

Not sure if it's the same cause, but a friend of mine has a similar
setup, and she had the same sort of problem when streaming on Twitch.
Her solution was to set it to 4k 30fps and select recording video mode
(without actually recording).

ChrisA
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Re: [FFmpeg-user] Trying to stream to rtmp from my rsp4 and a GoPro

[Mike Soultanian]

Well.. that was extremely frustrating. I've seriously been going at this 
for probably 16 hours, scouring the net for documentation and trying 
other people's tutorials, wondering why my setup wasn't working as well 
as all the examples that described all the cool stuff you could do with 
ffmpeg.  It was only after I purchased another capture card (Elgato Cam 
Link 4k) that I found I found this article when searching for *ffmpeg 
elgato cam link* and found this page:


https://blog.eigenvalue.net/ffmpeg-elgato-camlink-4k/

What was so crucial was one little tidbit towards the end of the page 
where the author writes (referring to running the ffmpeg command):


Unfortunately, most of the time it will get stuck after two frames. 
After some random experimentation, I noticed that unplugging the 
device allowed me to record once, most of the time. I think that it is 
due to syncing the audio / video stream. The video source seems to 
request key frames doesn't get the expected data afterwards. Or 
something else.




This was *exactly* the behavior I was running into, but I had no idea 
that I was actually running into that particular issue!  This whole time 
I had a gut feeling that there was somewhat inconsistent behavior 
(sometimes it would seem to work and then on the next run with the same 
settings it would have very low FPS), but I'm a total newbie to this so 
I didn't know if this was just normal behavior or something was wrong.  
I really wonder how many people run into this kind of issue because not 
only did this slow me down big time, but I also feel bad for wasting 
other people's time on something for which there's a super-simple fix. 
I'm not sure if it isn't already in the documentation, but it would 
probably be smart to make mention of this somewhere.  Also, if there's 
any way for ffmeg to detect that it's in this kind of state, I think 
that would be great if it were to throw a warning that something is up.  
I'm not sure if it's possible, but I felt it worth mentioning.


Soo, after running this nifty command before running ffmpeg:

sudo sh -c "echo 0 > /sys/bus/usb/devices/2-1/authorized";sudo sh -c 
"echo 1 > /sys/bus/usb/devices/2-1/authorized";


voila!  It captures at 30fps, and with my cheap-o capture card!  I'll be 
returning the Elgato Cam Link 4k because it seems like it only outputs 
at 4k, and if I'm understanding things correctly, that means I'm 
expending extra CPU cycles to down-convert it to 720p instead of it 
already being at 720p.  Plus, why spend $99 if I don't need to!?


So Carl, to answer your questions:

To answer your questions:

I was thinking about yuv420p but I don't know how you want to encode
(and what you plan to do with the resulting file).


My ultimate goal is to stream my GoPro into my Raspberry Pi, then send 
that over a mobile link up to Twitch for my IRL live stream. I just 
tried streaming to Twitch from my GoPro through the Raspberry Pi (with a 
direct Internet connection) this morning and it works!  Oddly, the 
timestamps are different, but the audio does seem to be synced so I 
guess I'll run with it?!  Now that I got things working I will start 
with the wiki guide for streaming on the ffmpeg site.



It would seem like both my capture card and my logitech support
the same formats, but the logitech 920 also lists h264 (listed below)
- is that why it's allowing it to work?

That's completely unrelated but has the advantage that you don't have
to encode.


Got it!



What I don't understand is why I'm able to record either video or audio
from the capture card, but when they're both together it's not happy.

How should FFmpeg mux audio and video if one has timestamps
starting with 0 and the other with 1000?
You can - easily - let the audio stream start with 0 but the problem
is that the result will not play in-sync, see the setps documentation.


Fortunately it seems like this isn't an issue now that I got things 
resolved by unplugging the unit before running it...


Thanks for your patience on this!  I appreciate the help so far - lots 
of learning going on here!


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Re: [FFmpeg-user] Trying to stream to rtmp from my rsp4 and a GoPro

[Carl Eugen Hoyos]

Am So., 14. Feb. 2021 um 22:27 Uhr schrieb Mike Soultanian
:
>
> On 2/14/2021 12:40 PM, Carl Eugen Hoyos wrote:
>
> >> Should ffmpeg be able to capture from any capture card
> > Only video4linux2 is supported, how well it works depends
> > primarily on the kernel driver.
> >
> > You probably want a card that provides data in a pix_fmt
> > that your hardware encoder supports.
>
> If I'm understanding correctly, this would be what you refer to *yuyv422*?

I was thinking about yuv420p but I don't know how you want to encode
(and what you plan to do with the resulting file).

> It would seem like both my capture card and my logitech support
> the same formats, but the logitech 920 also lists h264 (listed below)
> - is that why it's allowing it to work?

That's completely unrelated but has the advantage that you don't have
to encode.

> What I don't understand is why I'm able to record either video or audio
> from the capture card, but when they're both together it's not happy.

How should FFmpeg mux audio and video if one has timestamps
starting with 0 and the other with 1000?
You can - easily - let the audio stream start with 0 but the problem
is that the result will not play in-sync, see the setps documentation.

Carl Eugen
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Re: [FFmpeg-user] Trying to stream to rtmp from my rsp4 and a GoPro

[Mike Soultanian]

On 2/14/2021 12:40 PM, Carl Eugen Hoyos wrote:


Should ffmpeg be able to capture from any capture card

Only video4linux2 is supported, how well it works depends
primarily on the kernel driver.

You probably want a card that provides data in a pix_fmt
that your hardware encoder supports.


If I'm understanding correctly, this would be what you refer to *yuyv422*?

It would seem like both my capture card and my logitech support the same 
formats, but the logitech 920 also lists h264 (listed below) - is that 
why it's allowing it to work?


What I don't understand is why I'm able to record either video or audio 
from the capture card, but when they're both together it's not happy.  
Is the combining process of the two sources (audio/video) for the 
capture card still dependent on the kernel driver?  In other words, 
since I'm seeing video and hearing audio, wouldn't that mean the kernel 
driver is supporting my capture card, or is that a false assumption?  I 
have no issue viewing the combined audio/video in the video4linux2 test 
utility.  Obviously I don't know a whole lot about this stuff, but I'm 
trying to digest as much of it as possible so I can understand what's 
going on...


*Capture card**
*

**

*pi@raspberrypi:~ $ v4l2-ctl --list-formats-ext**
***ioctl: VIDIOC_ENUM_FMT
    Type: Video Capture

    [0]: 'MJPG' (Motion-JPEG, compressed)
        Size: Discrete 1920x1080
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
        Size: Discrete 640x480
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
        Size: Discrete 800x600
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
        Size: Discrete 1024x768
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
        Size: Discrete 1280x720
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
        Size: Discrete 1280x960
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
        Size: Discrete 1280x1024
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
        Size: Discrete 1360x768
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
        Size: Discrete 1400x900
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
        Size: Discrete 1440x900
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
    [1]: 'YUYV' (YUYV 4:2:2)
        Size: Discrete 1920x1080
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
        Size: Discrete 640x480
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
        Size: Discrete 800x600
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
        Size: Discrete 1024x768
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
        Size: Discrete 1280x720
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
        Size: Discrete 1280x960
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
        Size: Discrete 1280x1024
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
        Size: Discrete 1360x768
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
        Size: Discrete 1400x900
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
        Size: Discrete 1440x900
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.033s (30.000 fps)

*Logitech c920**
*

**

*pi@raspberrypi:~ $ v4l2-ctl --list-formats-ext*
ioctl: VIDIOC_ENUM_FMT
    Type: Video Capture

    [0]: 'YUYV' (YUYV 4:2:2)
        Size: Discrete 640x480
            Interval: Discrete 0.033s (30.000 fps)
            Interval: Discrete 0.042s (24.000 fps)
            Interval: Discrete 0.050s (20.000 fps)
            Interval: Discrete 0.067s (15.000 fps)
            Interval: Discrete 0.100s (10.000 fps)
            Interval: Discrete 0.133s (7.500 fps)
            Interval: Discrete 0.200s (5.000 fps)
        Size: Discrete 160x90
            Interval: Discrete 0.033s (30.000 fps)
            Interval: Discrete 0.042s (24.000 fps)
            Interval: Discrete 0.050s (20.000 fps)
            Interval: Discrete 0.067s (15.000 fps)
            Interval: Discrete 0.100s (10.000 fps)
            Interval: Discrete 0.133s (7.500 fps)
            Interval: Discrete 0.200s (5.000 

Re: [FFmpeg-user] Trying to stream to rtmp from my rsp4 and a GoPro

[Carl Eugen Hoyos]

Am So., 14. Feb. 2021 um 20:49 Uhr schrieb Mike Soultanian
:

> Should ffmpeg be able to capture from any capture card

Only video4linux2 is supported, how well it works depends
primarily on the kernel driver.

You probably want a card that provides data in a pix_fmt
that your hardware encoder supports.

Carl Eugen
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Re: [FFmpeg-user] Trying to stream to rtmp from my rsp4 and a GoPro

[Mike Soultanian]

On 2/14/2021 8:57 AM, Carl Eugen Hoyos wrote:

Am So., 14. Feb. 2021 um 17:53 Uhr schrieb Mike Soultanian
:

On 2/14/2021 3:27 AM, Carl Eugen Hoyos wrote:

Please provide this command line including complete, uncut console
output to allow us understanding what's going on:
$ ffmpeg -ts abs -i /dev/video0 -f alsa -ac 2 -i hw:CARD=capture,DEV=0
Any difference if you use mono2abs instead of abs? 



Unfortunately no - same results.  So as sanity check, and I'm annoyed 
(and I apologize) that I didn't try this sooner (I blame it on 
ffmpg/audio/video brain overload), I plugged in my Logitech c920 webcam 
and ran similar commands and it was able to record audio and video, so 
I'm guessing that there is an issue with this capture card (that's my 
best guess).  Last night I ordered an Elgato Camlink 4k as I saw an 
article that used that capture card (and they specifically say it needs 
to be UVC/UAC-compatible) and it should be here this evening.  Lemme 
give that whirl and see if it produces better results.  I was hoping not 
to purchase yet another capture card, but that camlink is pretty 
well-respected and I'm sure I'll get use out of it for other stuff as well.


Should ffmpeg be able to capture from any capture card, or are there 
hardware limitations that would cause these kinds of issues to the point 
where you just say it's not even possible with that particular device, 
or have you tried to make ffmpeg robust enough to handle anything?  The 
capture device is a generic "ezcap" chipset that's rebranded for 
different manufacturers that I found on Amazon - they don't even have 
the specific item listed that I purchased any more...


Thanks!

Mike

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Re: [FFmpeg-user] Trying to stream to rtmp from my rsp4 and a GoPro

[Carl Eugen Hoyos]

Am So., 14. Feb. 2021 um 17:53 Uhr schrieb Mike Soultanian
:
>
> On 2/14/2021 3:27 AM, Carl Eugen Hoyos wrote:
> > Please provide this command line including complete, uncut console
> > output to allow us understanding what's going on:
> > $ ffmpeg -ts abs -i /dev/video0 -f alsa -ac 2 -i hw:CARD=capture,DEV=0

> *pi@raspberrypi:~ $ ffmpeg -ts abs -i /dev/video0 -f alsa -ac 2 -i
> hw:CARD=capture,DEV=0*

> [video4linux2,v4l2 @ 0x2c75320] Unknown timestamps
> Input #0, video4linux2,v4l2, from '/dev/video0':

>Duration: N/A, start: 0.00, bitrate: 442368 kb/s

Any difference if you use mono2abs instead of abs?

Carl Eugen
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Re: [FFmpeg-user] Trying to stream to rtmp from my rsp4 and a GoPro

[Mike Soultanian]

On 2/14/2021 3:27 AM, Carl Eugen Hoyos wrote:

Please provide this command line including complete, uncut console
output to allow us understanding what's going on:
$ ffmpeg -ts abs -i /dev/video0 -f alsa -ac 2 -i hw:CARD=capture,DEV=0


Sure!  Here you go:

*pi@raspberrypi:~ $ ffmpeg -ts abs -i /dev/video0 -f alsa -ac 2 -i 
hw:CARD=capture,DEV=0*
ffmpeg version N-101069-g000b250 Copyright (c) 2000-2021 the FFmpeg 
developers

  built with gcc 8 (Raspbian 8.3.0-6+rpi1)
  configuration: --prefix=/home/pi/ffmpeg_build 
--pkg-config-flags=--static 
--extra-cflags=-I/home/pi/ffmpeg_build/include 
--extra-ldflags=-L/home/pi/ffmpeg_build/lib --extra-libs='-lpthread -lm' 
--bindir=/home/pi/bin --enable-gpl --enable-gnutls --enable-libass 
--enable-libfdk-aac --enable-libfreetype --enable-libmp3lame 
--enable-libopus --enable-libsvtav1 --enable-libdav1d --enable-libvorbis 
--enable-libvpx --enable-libx264 --enable-libx265 --enable-omx 
--enable-omx-rpi --enable-nonfree

  libavutil  56. 65.100 / 56. 65.100
  libavcodec 58.122.100 / 58.122.100
  libavformat    58. 67.100 / 58. 67.100
  libavdevice    58. 11.103 / 58. 11.103
  libavfilter 7.106.100 /  7.106.100
  libswscale  5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
  libpostproc    55.  8.100 / 55.  8.100
[video4linux2,v4l2 @ 0x2c75320] Dequeued v4l2 buffer contains corrupted 
data (0 bytes).

[video4linux2,v4l2 @ 0x2c75320] Unknown timestamps
Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 0.00, bitrate: 442368 kb/s
  Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1280x720, 
442368 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc

Guessed Channel Layout for Input Stream #1.0 : stereo
Input #1, alsa, from 'hw:CARD=capture,DEV=0':
  Duration: N/A, start: 1613320991.151065, bitrate: 1536 kb/s
  Stream #1:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
At least one output file must be specified


And I'm not sure if you wanted it, but I figured I'd include the output 
if I specified a file (I hit "q" to stop the output because it kept 
going on and on):


*pi@raspberrypi:~ $ ffmpeg -ts abs -i /dev/video0 -f alsa -ac 2 -i 
hw:CARD=capture,DEV=0 -y Desktop/test.mp4 *
ffmpeg version N-101069-g000b250 Copyright (c) 2000-2021 the FFmpeg 
developers

  built with gcc 8 (Raspbian 8.3.0-6+rpi1)
  configuration: --prefix=/home/pi/ffmpeg_build 
--pkg-config-flags=--static 
--extra-cflags=-I/home/pi/ffmpeg_build/include 
--extra-ldflags=-L/home/pi/ffmpeg_build/lib --extra-libs='-lpthread -lm' 
--bindir=/home/pi/bin --enable-gpl --enable-gnutls --enable-libass 
--enable-libfdk-aac --enable-libfreetype --enable-libmp3lame 
--enable-libopus --enable-libsvtav1 --enable-libdav1d --enable-libvorbis 
--enable-libvpx --enable-libx264 --enable-libx265 --enable-omx 
--enable-omx-rpi --enable-nonfree

  libavutil  56. 65.100 / 56. 65.100
  libavcodec 58.122.100 / 58.122.100
  libavformat    58. 67.100 / 58. 67.100
  libavdevice    58. 11.103 / 58. 11.103
  libavfilter 7.106.100 /  7.106.100
  libswscale  5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
  libpostproc    55.  8.100 / 55.  8.100
[video4linux2,v4l2 @ 0x3225370] Dequeued v4l2 buffer contains corrupted 
data (0 bytes).

[video4linux2,v4l2 @ 0x3225370] Unknown timestamps
Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 0.00, bitrate: 442368 kb/s
  Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1280x720, 
442368 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc

Guessed Channel Layout for Input Stream #1.0 : stereo
Input #1, alsa, from 'hw:CARD=capture,DEV=0':
  Duration: N/A, start: 1613321366.545618, bitrate: 1536 kb/s
  Stream #1:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  Stream #1:0 -> #0:1 (pcm_s16le (native) -> aac (native))
Press [q] to stop, [?] for help
[video4linux2,v4l2 @ 0x3225370] Dequeued v4l2 buffer contains corrupted 
data (0 bytes).

[video4linux2,v4l2 @ 0x3225370] Unknown timestamps
[video4linux2,v4l2 @ 0x3225370] Dequeued v4l2 buffer contains corrupted 
data (0 bytes).

[video4linux2,v4l2 @ 0x3225370] Unknown timestamps
[video4linux2,v4l2 @ 0x3225370] Dequeued v4l2 buffer contains corrupted 
data (0 bytes).

[video4linux2,v4l2 @ 0x3225370] Unknown timestamps
[video4linux2,v4l2 @ 0x3225370] Dequeued v4l2 buffer contains corrupted 
data (0 bytes).

[video4linux2,v4l2 @ 0x3225370] Unknown timestamps
[video4linux2,v4l2 @ 0x3225370] Dequeued v4l2 buffer contains corrupted 
data (0 bytes).

[video4linux2,v4l2 @ 0x3225370] Unknown timestamps
[video4linux2,v4l2 @ 0x3225370] Dequeued v4l2 buffer contains corrupted 
data (0 bytes).

[video4linux2,v4l2 @ 0x3225370] Unknown timestamps
[video4linux2,v4l2 @ 0x3225370] Dequeued v4l2 buffer contains corrupted 
data (0 bytes).

[video4linux2,v4l2 @ 0x3225370] Unknown timestamps
[video4linux2,v4l2 @ 0x3225370] Dequeued v4l2 buffer contains corrupted 

Re: [FFmpeg-user] Trying to stream to rtmp from my rsp4 and a GoPro

[Carl Eugen Hoyos]

Am So., 14. Feb. 2021 um 09:49 Uhr schrieb Mike Soultanian
:

> *pi@raspberrypi:~ $ v4l2-ctl --set-fmt-video=width=1280,height=720 *
> *pi@raspberrypi:~ $ ffmpeg -f v4l2 -input_format yuyv422 -framerate 30
> -i /dev/video0 -f alsa -ac 2 -i hw:CARD=capture,DEV=0 -c:v libx264 -vf
> format=yuv420p -y -ts abs Desktop/test.mp4*

Please provide this command line including complete, uncut console
output to allow us understanding what's going on:
$ ffmpeg -ts abs -i /dev/video0 -f alsa -ac 2 -i hw:CARD=capture,DEV=0

Carl Eugen
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Re: [FFmpeg-user] Trying to stream to rtmp from my rsp4 and a GoPro

[Mike Soultanian]

On 2/13/2021 5:36 PM, Carl Eugen Hoyos wrote:

It is not possible to synchronize these two streams due
to the different start times, test the ts option:
https://ffmpeg.org/ffmpeg-devices.html#video4linux2_002c-v4l2
Where do I use the -ts option (audio, video, output, all)?  And are 
you recommending using default, abs, or mono2abs?



Just fyi, I tried all of the following and none of them really worked:

1. ffmpeg -f v4l2 -input_format yuyv422 -framerate 30 -i /dev/video0 -f 
alsa -ac 2 -i hw:CARD=capture,DEV=0 -c:v libx264 -vf format=yuv420p -y 
-ts default Desktop/test.mp4


2. ffmpeg -f v4l2 -input_format yuyv422 -framerate 30 -i /dev/video0 -f 
alsa -ac 2 -i hw:CARD=capture,DEV=0 -c:v libx264 -vf format=yuv420p -y 
-ts abs Desktop/test.mp4


3. ffmpeg -f v4l2 -input_format yuyv422 -framerate 30 -i /dev/video0 -f 
alsa -ac 2 -i hw:CARD=capture,DEV=0 -c:v libx264 -vf format=yuv420p -y 
-ts mono2abs Desktop/test.mp4


So 2 seems to be the closest to working, but with really inconsistent 
behavior it's a stretch to say working - on the first run (only after a 
reboot) I get glitchy video that freezes every now and then with little 
blips of audio every 5 seconds or so, and if I run the command again the 
fps drops down super low and no video is recorded, but strangely audio 
is recorded.  Here is the output:


*pi@raspberrypi:~ $ v4l2-ctl --set-fmt-video=width=1280,height=720 *
*pi@raspberrypi:~ $ ffmpeg -f v4l2 -input_format yuyv422 -framerate 30 
-i /dev/video0 -f alsa -ac 2 -i hw:CARD=capture,DEV=0 -c:v libx264 -vf 
format=yuv420p -y -ts abs Desktop/test.mp4*
ffmpeg version N-101069-g000b250 Copyright (c) 2000-2021 the FFmpeg 
developers

  built with gcc 8 (Raspbian 8.3.0-6+rpi1)
  configuration: --prefix=/home/pi/ffmpeg_build 
--pkg-config-flags=--static 
--extra-cflags=-I/home/pi/ffmpeg_build/include 
--extra-ldflags=-L/home/pi/ffmpeg_build/lib --extra-libs='-lpthread -lm' 
--bindir=/home/pi/bin --enable-gpl --enable-gnutls --enable-libass 
--enable-libfdk-aac --enable-libfreetype --enable-libmp3lame 
--enable-libopus --enable-libsvtav1 --enable-libdav1d --enable-libvorbis 
--enable-libvpx --enable-libx264 --enable-libx265 --enable-omx 
--enable-omx-rpi --enable-nonfree

  libavutil  56. 65.100 / 56. 65.100
  libavcodec 58.122.100 / 58.122.100
  libavformat    58. 67.100 / 58. 67.100
  libavdevice    58. 11.103 / 58. 11.103
  libavfilter 7.106.100 /  7.106.100
  libswscale  5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
  libpostproc    55.  8.100 / 55.  8.100
Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 306.070836, bitrate: 442368 kb/s
  Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1280x720, 
442368 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc

Guessed Channel Layout for Input Stream #1.0 : stereo
Input #1, alsa, from 'hw:CARD=capture,DEV=0':
  Duration: N/A, start: 1613290013.175295, bitrate: 1536 kb/s
  Stream #1:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  Stream #1:0 -> #0:1 (pcm_s16le (native) -> aac (native))
Press [q] to stop, [?] for help
[libx264 @ 0x35387a0] using cpu capabilities: ARMv6 NEON
[libx264 @ 0x35387a0] profile High, level 3.1
[libx264 @ 0x35387a0] 264 - core 146 - H.264/MPEG-4 AVC codec - Copyleft 
2003-2015 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 
deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 
mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 
deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 
lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 
bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 
b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 
keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf 
mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 
aq=1:1.00
[alsa @ 0x35262c0] Thread message queue blocking; consider raising the 
thread_queue_size option (current value: 8)

Output #0, mp4, to 'Desktop/test.mp4':
  Metadata:
    encoder : Lavf58.67.100
  Stream #0:0: Video: h264 (avc1 / 0x31637661), yuv420p(tv, 
progressive), 1280x720, q=2-31, 30 fps, 15360 tbn

    Metadata:
  encoder : Lavc58.122.100 libx264
    Side data:
  cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
  Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, 
fltp, 128 kb/s

    Metadata:
  encoder : Lavc58.122.100 aac
[video4linux2,v4l2 @ 0x35233e0] Thread message queue blocking; consider 
raising the thread_queue_size option (current value: 8)
*[alsa @ 0x35262c0] ALSA buffer xrun.   0kB time=00:00:00.36 bitrate=   
1.0kbits/s dup=1 drop=0 speed=0.121x **
**[alsa @ 0x35262c0] ALSA buffer xrun.1024kB time=00:00:03.35 
bitrate=2503.1kbits/s dup=21 drop=0 speed=0.351x **
**[alsa @ 0x35262c0] ALSA buffer xrun.2304kB time=00:00:10.05 

Re: [FFmpeg-user] Trying to stream to rtmp from my rsp4 and a GoPro

[Mike Soultanian]

On 2/13/2021 5:36 PM, Carl Eugen Hoyos wrote:

It is not possible to synchronize these two streams due
to the different start times, test the ts option:
https://ffmpeg.org/ffmpeg-devices.html#video4linux2_002c-v4l2

Please find out what top-posting means and avoid it here, Carl Eugen
___


Sorry about the top-post!

Where do I use the -ts option (audio, video, output, all)?  And are you 
recommending using default, abs, or mono2abs?


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Re: [FFmpeg-user] Trying to stream to rtmp from my rsp4 and a GoPro

[Carl Eugen Hoyos]

Am So., 14. Feb. 2021 um 01:51 Uhr schrieb Mike Soultanian
:

> Input #0, video4linux2,v4l2, from '/dev/video0':
>Duration: N/A, start: 0.00, bitrate: 442368 kb/s
>Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1280x720,
> 442368 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc
> Guessed Channel Layout for Input Stream #1.0 : stereo
> Input #1, alsa, from 'hw:CARD=capture,DEV=0':
>Duration: N/A, start: 1613261965.042902, bitrate: 1536 kb/s

It is not possible to synchronize these two streams due
to the different start times, test the ts option:
https://ffmpeg.org/ffmpeg-devices.html#video4linux2_002c-v4l2

Please find out what top-posting means and avoid it here, Carl Eugen
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Re: [FFmpeg-user] Trying to stream to rtmp from my rsp4 and a GoPro

[Mike Soultanian]

Ok, I did a lot more testing and have learned a bit more about my 
hardware and the various names of audio devices.  Also, I didn't mention 
it in the previous email, but I did recompile ffmpeg from the latest 
source.  After a bunch of research and testing I found all of these 
commands to work:


v4l2-ctl --set-fmt-video=width=1280,height=720
ffmpeg -f v4l2 -input_format yuyv422 -framerate 30 -i /dev/video0 -c:v 
libx264            -vf format=yuv420p -y Desktop/test.mp4
ffmpeg -f v4l2 -input_format yuyv422 -framerate 30 -i /dev/video0 -c:v 
h264_omx  -vf format=yuv420p -y Desktop/test.mp4
ffmpeg -f v4l2 -input_format yuyv422 -framerate 30 -i /dev/video0 -c:v 
h264_v4l2m2m -vf format=yuv420p -y Desktop/test.mp4
ffmpeg -f alsa -ac 2 -i 
hw:CARD=capture,DEV=0    -c:v 
h264_omx  -vf format=yuv420p -y Desktop/test.mp4


So, if I'm understanding this all correctly, I'm using the raw feed from 
my capture card and converting it into a different format utilizing the 
software encoder (first ffmpeg line above) and the hardware encoder 
(second and third lines - omx/v4l2m2m), so it looks like I figured out 
hardware encoding - one problem solved!  The first 3 ffmpeg lines 
successfully recorded video.  I was also able to successfully record 
audio in the last line above.


Now, here's where I tried to capture audio and video together:
*ffmpeg -f v4l2 -input_format yuyv422 -framerate 30 -i /dev/video0 -f 
alsa -ac 2 -i hw:CARD=capture,DEV=0 -c:v libx264 -vf format=yuv420p -y 
Desktop/test.mp4*


I let the command run for about 20 seconds.  When I play the file it has 
audio at the beginning but no video, and the audio doesn't start until 
about 5 seconds in. Eventually the audio stops and then it's just 
silence and black. What's weird is the length is 14 minutes and if I try 
and seek it will jump to the end and then briefly show some captured 
video and then stop.  So it's like I'm getting both audio and video, but 
it's not lined up and there's barely any video.  Also when the capture 
was occurring, the *time= *counter wasn't going up - it was just staying 
stuck at *time=00:14:31.46* whereas with all the individual audio or 
video captures it will count up - plus that number coincidentally is the 
length of the recorded video.  Also, the frame rate is super low with 
the above audio/video ffmpeg line whereas it hangs out in the high 20s 
when just recording video, probably because it's actually recording 
video correctly...


Here is the full output from the failed video/audio capture (I hit q 
after about 20 seconds):


*pi@raspberrypi:~ $ ffmpeg -f v4l2 -input_format yuyv422 -framerate 30 
-i /dev/video0 -f alsa -ac 2 -i hw:CARD=capture,DEV=0 -c:v libx264 -vf 
format=yuv420p -y Desktop/test.mp4*
ffmpeg version N-101069-g000b250 Copyright (c) 2000-2021 the FFmpeg 
developers

  built with gcc 8 (Raspbian 8.3.0-6+rpi1)
  configuration: --prefix=/home/pi/ffmpeg_build 
--pkg-config-flags=--static 
--extra-cflags=-I/home/pi/ffmpeg_build/include 
--extra-ldflags=-L/home/pi/ffmpeg_build/lib --extra-libs='-lpthread -lm' 
--bindir=/home/pi/bin --enable-gpl --enable-gnutls --enable-libass 
--enable-libfdk-aac --enable-libfreetype --enable-libmp3lame 
--enable-libopus --enable-libsvtav1 --enable-libdav1d --enable-libvorbis 
--enable-libvpx --enable-libx264 --enable-libx265 --enable-omx 
--enable-omx-rpi --enable-nonfree

  libavutil  56. 65.100 / 56. 65.100
  libavcodec 58.122.100 / 58.122.100
  libavformat    58. 67.100 / 58. 67.100
  libavdevice    58. 11.103 / 58. 11.103
  libavfilter 7.106.100 /  7.106.100
  libswscale  5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
  libpostproc    55.  8.100 / 55.  8.100
[video4linux2,v4l2 @ 0x3b3e390] Dequeued v4l2 buffer contains corrupted 
data (0 bytes).

Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 0.00, bitrate: 442368 kb/s
  Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1280x720, 
442368 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc

Guessed Channel Layout for Input Stream #1.0 : stereo
Input #1, alsa, from 'hw:CARD=capture,DEV=0':
  Duration: N/A, start: 1613261965.042902, bitrate: 1536 kb/s
  Stream #1:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  Stream #1:0 -> #0:1 (pcm_s16le (native) -> aac (native))
Press [q] to stop, [?] for help
[video4linux2,v4l2 @ 0x3b3e390] Dequeued v4l2 buffer contains corrupted 
data (0 bytes).

    Last message repeated 30 times
[libx264 @ 0x3b56fe0] using cpu capabilities: ARMv6 NEON
[libx264 @ 0x3b56fe0] profile High, level 3.1
[libx264 @ 0x3b56fe0] 264 - core 146 - H.264/MPEG-4 AVC codec - Copyleft 
2003-2015 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 
deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 
mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 
deadzone=21,11 fast_pskip=1 

Re: [FFmpeg-user] Trying to stream to rtmp from my rsp4 and a GoPro

[Gisbert Haas]

Can you post the ffmpeg output with audio input in the command line

Sent from my iPhone

On 13. Feb 2021, at 11:21, Mike Soultanian  wrote:



CAUTION: This email originated from outside of the organization. Do not click 
links or open attachments unless you recognize the sender and know the content 
is safe.


On 2/13/2021 1:54 AM, Gisbert Haas wrote:
can you post the full output please.

Sorry, I didn't include it because when I have audio it doesn't work.  I have 
tried -f alsa -i with the following: plughw:2,0, hw:CARD=capture,DEV=0, and 
plughw:CARD=capture,DEV=0 and none of them seem to work - I could very well be 
using them incorrectly.  If you're able to tell when I should be using after 
"-i" for the sound, I'll give it a try.  Here is the output from various 
commands (ezcap is my USB capture card):

pi@raspberrypi:~ $ cat /proc/asound/devices
0: [ 0]   : control
16: [ 0- 0]: digital audio playback
32: [ 1]   : control
33:: timer
48: [ 1- 0]: digital audio playback
64: [ 2]   : control
88: [ 2- 0]: digital audio capture

pi@raspberrypi:~ $ arecord -L
default
Playback/recording through the PulseAudio sound server
null
Discard all samples (playback) or generate zero samples (capture)
jack
JACK Audio Connection Kit
pulse
PulseAudio Sound Server
usbstream:CARD=b1
bcm2835 HDMI 1
USB Stream Output
usbstream:CARD=Headphones
bcm2835 Headphones
USB Stream Output
sysdefault:CARD=capture
ezcap U3 capture, USB Audio
Default Audio Device
front:CARD=capture,DEV=0
ezcap U3 capture, USB Audio
Front speakers
surround21:CARD=capture,DEV=0
ezcap U3 capture, USB Audio
2.1 Surround output to Front and Subwoofer speakers
surround40:CARD=capture,DEV=0
ezcap U3 capture, USB Audio
4.0 Surround output to Front and Rear speakers
surround41:CARD=capture,DEV=0
ezcap U3 capture, USB Audio
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=capture,DEV=0
ezcap U3 capture, USB Audio
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=capture,DEV=0
ezcap U3 capture, USB Audio
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=capture,DEV=0
ezcap U3 capture, USB Audio
7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=capture,DEV=0
ezcap U3 capture, USB Audio
IEC958 (S/PDIF) Digital Audio Output
dmix:CARD=capture,DEV=0
ezcap U3 capture, USB Audio
Direct sample mixing device
dsnoop:CARD=capture,DEV=0
ezcap U3 capture, USB Audio
Direct sample snooping device
hw:CARD=capture,DEV=0
ezcap U3 capture, USB Audio
Direct hardware device without any conversions
plughw:CARD=capture,DEV=0
ezcap U3 capture, USB Audio
Hardware device with all software conversions
usbstream:CARD=capture
ezcap U3 capture
USB Stream Output

pi@raspberrypi:~ $ arecord -l
 List of CAPTURE Hardware Devices 
card 2: capture [ezcap U3 capture], device 0: USB Audio [USB Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0


And here is the command and output for when it works (without sound - if you 
can help me form the correct audio input syntax, I'll gladly try it and post 
the output):

pi@raspberrypi:~ $ v4l2-ctl --set-fmt-video=width=1280,height=720 && ffmpeg -f 
v4l2 -thread_queue_size 384 -video_size 1280x720 -framerate 30 -i /dev/video0 
-c:v h264_omx -preset veryfast -b:v 1984k -maxrate 1984k -bufsize 3968k -vf 
"format=yuv420p" -g 60 -c:a aac -b:a 128k -ar 44100 -f flv 
rtmp://sfo.contribute.live-video.net/app/
ffmpeg version N-101069-g000b250 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 8 (Raspbian 8.3.0-6+rpi1)
  configuration: --prefix=/home/pi/ffmpeg_build --pkg-config-flags=--static 
--extra-cflags=-I/home/pi/ffmpeg_build/include 
--extra-ldflags=-L/home/pi/ffmpeg_build/lib --extra-libs='-lpthread -lm' 
--bindir=/home/pi/bin --enable-gpl --enable-gnutls --enable-libass 
--enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus 
--enable-libsvtav1 --enable-libdav1d --enable-libvorbis --enable-libvpx 
--enable-libx264 --enable-libx265 --enable-omx --enable-omx-rpi --enable-nonfree
  libavutil  56. 65.100 / 56. 65.100
  libavcodec 58.122.100 / 58.122.100
  libavformat58. 67.100 / 58. 67.100
  libavdevice58. 11.103 / 58. 11.103
  libavfilter 7.106.100 /  7.106.100
  libswscale  5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
  libpostproc55.  8.100 / 55.  8.100
[video4linux2,v4l2 @ 0x327d420] Dequeued v4l2 buffer contains corrupted data (0 
bytes).
Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 0.00, bitrate: 442368 kb/s
  Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1280x720, 442368 
kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc
Codec AVOption preset (Encoding preset [0, 8]) specified for output file #0 
(rtmp://sfo.contribute.live-video.net/app/) has not been used for any 

Re: [FFmpeg-user] Trying to stream to rtmp from my rsp4 and a GoPro

[Mike Soultanian]

On 2/13/2021 1:54 AM, Gisbert Haas wrote:

can you post the full output please.


Sorry, I didn't include it because when I have audio it doesn't work.  I 
have tried *-f alsa -i* with the following: *plughw:2,0*, 
*hw:CARD=capture,DEV=0*, and *plughw:CARD=capture,DEV=0* and none of 
them seem to work - I could very well be using them incorrectly.  If 
you're able to tell when I should be using after "-i" for the sound, 
I'll give it a try.  Here is the output from various commands (ezcap is 
my USB capture card):


*pi@raspberrypi:~ $ cat /proc/asound/devices*
0: [ 0]   : control
16: [ 0- 0]: digital audio playback
32: [ 1]   : control
33:    : timer
48: [ 1- 0]: digital audio playback
64: [ 2]   : control
88: [ 2- 0]: digital audio capture

*pi@raspberrypi:~ $ arecord -L*
default
    Playback/recording through the PulseAudio sound server
null
    Discard all samples (playback) or generate zero samples (capture)
jack
    JACK Audio Connection Kit
pulse
    PulseAudio Sound Server
usbstream:CARD=b1
    bcm2835 HDMI 1
    USB Stream Output
usbstream:CARD=Headphones
    bcm2835 Headphones
    USB Stream Output
sysdefault:CARD=capture
    ezcap U3 capture, USB Audio
    Default Audio Device
front:CARD=capture,DEV=0
    ezcap U3 capture, USB Audio
    Front speakers
surround21:CARD=capture,DEV=0
    ezcap U3 capture, USB Audio
    2.1 Surround output to Front and Subwoofer speakers
surround40:CARD=capture,DEV=0
    ezcap U3 capture, USB Audio
    4.0 Surround output to Front and Rear speakers
surround41:CARD=capture,DEV=0
    ezcap U3 capture, USB Audio
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=capture,DEV=0
    ezcap U3 capture, USB Audio
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=capture,DEV=0
    ezcap U3 capture, USB Audio
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=capture,DEV=0
    ezcap U3 capture, USB Audio
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=capture,DEV=0
    ezcap U3 capture, USB Audio
    IEC958 (S/PDIF) Digital Audio Output
dmix:CARD=capture,DEV=0
    ezcap U3 capture, USB Audio
    Direct sample mixing device
dsnoop:CARD=capture,DEV=0
    ezcap U3 capture, USB Audio
    Direct sample snooping device
hw:CARD=capture,DEV=0
    ezcap U3 capture, USB Audio
    Direct hardware device without any conversions
plughw:CARD=capture,DEV=0
    ezcap U3 capture, USB Audio
    Hardware device with all software conversions
usbstream:CARD=capture
    ezcap U3 capture
    USB Stream Output

*pi@raspberrypi:~ $ arecord -l*
 List of CAPTURE Hardware Devices 
card 2: capture [ezcap U3 capture], device 0: USB Audio [USB Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

And here is the command and output for when it works (without sound - if 
you can help me form the correct audio input syntax, I'll gladly try it 
and post the output):


*pi@raspberrypi:~ $ v4l2-ctl --set-fmt-video=width=1280,height=720 && 
ffmpeg -f v4l2 -thread_queue_size 384 -video_size 1280x720 -framerate 30 
-i /dev/video0 -c:v h264_omx -preset veryfast -b:v 1984k -maxrate 1984k 
-bufsize 3968k -vf "format=yuv420p" -g 60 -c:a aac -b:a 128k -ar 44100 
-f flv rtmp://sfo.contribute.live-video.net/app/*
ffmpeg version N-101069-g000b250 Copyright (c) 2000-2021 the FFmpeg 
developers

  built with gcc 8 (Raspbian 8.3.0-6+rpi1)
  configuration: --prefix=/home/pi/ffmpeg_build 
--pkg-config-flags=--static 
--extra-cflags=-I/home/pi/ffmpeg_build/include 
--extra-ldflags=-L/home/pi/ffmpeg_build/lib --extra-libs='-lpthread -lm' 
--bindir=/home/pi/bin --enable-gpl --enable-gnutls --enable-libass 
--enable-libfdk-aac --enable-libfreetype --enable-libmp3lame 
--enable-libopus --enable-libsvtav1 --enable-libdav1d --enable-libvorbis 
--enable-libvpx --enable-libx264 --enable-libx265 --enable-omx 
--enable-omx-rpi --enable-nonfree

  libavutil  56. 65.100 / 56. 65.100
  libavcodec 58.122.100 / 58.122.100
  libavformat    58. 67.100 / 58. 67.100
  libavdevice    58. 11.103 / 58. 11.103
  libavfilter 7.106.100 /  7.106.100
  libswscale  5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
  libpostproc    55.  8.100 / 55.  8.100
[video4linux2,v4l2 @ 0x327d420] Dequeued v4l2 buffer contains corrupted 
data (0 bytes).

Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 0.00, bitrate: 442368 kb/s
  Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1280x720, 
442368 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc
Codec AVOption preset (Encoding preset [0, 8]) specified for output file 
#0 (rtmp://sfo.contribute.live-video.net/app/) has not been used for any 
stream. The most likely reason is either wrong type (e.g. a video option 
with no video streams) or that it is a private option of some encoder 
which was not actually used for any stream.

Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (h264_omx))
Press [q] to stop, 

Re: [FFmpeg-user] Trying to stream to rtmp from my rsp4 and a GoPro

[Gisbert Haas]

Hi Mike,


can you post the full output please.

I had the similar issues and curious if your output looks similar to mine.

Btw, in your command line you miss the audio input.


Gis.


On 2/13/21 1:23 AM, Mike Soultanian wrote:
CAUTION: This email originated from outside of the organization. Do 
not click links or open attachments unless you recognize the sender 
and know the content is safe.



Hey Everyone,

I'm trying to stream from my GoPro into a USB capture device through my
Raspberry Pi 4 and send the feed up to Twitch or my rtmp server. After
a lot of head banging I realized that there were two things that were
messing me up: 1) specifying an audio input seems to break things and 2)
trying to use the h264_v4l2m2m hardware encoder also seems to mess
things up.   After finding the ffmpeg streaming wiki here:

https://trac.ffmpeg.org/wiki/EncodingForStreamingSites

I was finally able to cobble this command-line together and get it
working... kinda:

*ffmpeg -f v4l2 -video_size 1280x720 -framerate 30 -i /dev/video0 -c:v
libx264 -preset veryfast -b:v 1984k -maxrate 1984k -bufsize 3968k -vf
"format=yuv420p" -g 60 -c:a aac -b:a 128k -ar 44100 -f flv
rtmp://sfo.contribute.live-video.net/app/[my key]*

I say kinda because I can't seem to get audio working.  Now, I just want
to say that using the QT v4l2 test utility I'm able to get audio and
video simultaneously, so I know that the capture feed from my GoPro is
healthy, and using ffmpeg I'm able to record either video from
*/dev/video0* or audio from *plughw:2,0*, but it seems like whenever I
add *-f alsa -i plughw:2,0* in addition to *-i /dev/video0*, it won't
stream anything (or record anything during my recording attempts).

Am I missing something obvious here?  I was hoping that I'm just doing
something stupid, but even looking on that wiki listed above it looks
like all I need to do is add *-f alsa -ac 2 -i plughw:2,0* and it should
work, but it just seems to kill the stream or record nothing.

Also, I'd love to be able to use the hardware encoder, so any thoughts
on that would be appreciated, but getting both audio and video is the
main priority.

Btw, if you're curious about what I'm doing, I'm trying to build a DIY
mobile streaming rig that I can take hangliding/paragliding with me so
people can watch.  I thought it would be a fun project but this portion
has turned out to be quite challenging!!

Thanks!

Mike

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[FFmpeg-user] Trying to stream to rtmp from my rsp4 and a GoPro

[Mike Soultanian]

Hey Everyone,

I'm trying to stream from my GoPro into a USB capture device through my 
Raspberry Pi 4 and send the feed up to Twitch or my rtmp server.  After 
a lot of head banging I realized that there were two things that were 
messing me up: 1) specifying an audio input seems to break things and 2) 
trying to use the h264_v4l2m2m hardware encoder also seems to mess 
things up.   After finding the ffmpeg streaming wiki here:


https://trac.ffmpeg.org/wiki/EncodingForStreamingSites

I was finally able to cobble this command-line together and get it 
working... kinda:


*ffmpeg -f v4l2 -video_size 1280x720 -framerate 30 -i /dev/video0 -c:v 
libx264 -preset veryfast -b:v 1984k -maxrate 1984k -bufsize 3968k -vf 
"format=yuv420p" -g 60 -c:a aac -b:a 128k -ar 44100 -f flv 
rtmp://sfo.contribute.live-video.net/app/[my key]*


I say kinda because I can't seem to get audio working.  Now, I just want 
to say that using the QT v4l2 test utility I'm able to get audio and 
video simultaneously, so I know that the capture feed from my GoPro is 
healthy, and using ffmpeg I'm able to record either video from 
*/dev/video0* or audio from *plughw:2,0*, but it seems like whenever I 
add *-f alsa -i plughw:2,0* in addition to *-i /dev/video0*, it won't 
stream anything (or record anything during my recording attempts).


Am I missing something obvious here?  I was hoping that I'm just doing 
something stupid, but even looking on that wiki listed above it looks 
like all I need to do is add *-f alsa -ac 2 -i plughw:2,0* and it should 
work, but it just seems to kill the stream or record nothing.


Also, I'd love to be able to use the hardware encoder, so any thoughts 
on that would be appreciated, but getting both audio and video is the 
main priority.


Btw, if you're curious about what I'm doing, I'm trying to build a DIY 
mobile streaming rig that I can take hangliding/paragliding with me so 
people can watch.  I thought it would be a fun project but this portion 
has turned out to be quite challenging!!


Thanks!

Mike

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ffmpeg-user mailing list
ffmpeg-user@ffmpeg.org
https://ffmpeg.org/mailman/listinfo/ffmpeg-user

To unsubscribe, visit link above, or email
ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".