Re: [FFmpeg-user] unsubscribe

[Walter Ebert]

On 09.04.19 22:54, Reindl Harald wrote:
> 
> 
> Am 09.04.19 um 22:53 schrieb Kieran O Leary:
>> On Tue, 9 Apr 2019, 21:13 Reindl Harald,  wrote:
>>
>>> Am 09.04.19 um 20:50 schrieb Ted Park:
> Am 09.04.19 um 10:56 schrieb dben...@bezeqint.net:
>
> hell you have the instructions on bottom of every single message

 It seems he was trying to follow them, but made a mistake. If you’re
>>> still here, you need to email ffmpeg-user-requ...@ffmpeg.org >> ffmpeg-user-requ...@ffmpeg.org>, not the mailing list itself dbenari
>>>
>>> what mistake can you make in case of "email
>>> ffmpeg-user-requ...@ffmpeg.org with subject unsubscribe" when you own a
>>> sane mind
>>
>>
>> Please do not be so insulting
> 
> you have no idea how insulting sounds!
> 


Your comment is not helpful
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Re: [FFmpeg-user] unsubscribe

[Reindl Harald]

Am 10.04.19 um 00:20 schrieb Phil Rhodes via ffmpeg-user:
>  >> Please do not be so insulting
> 
>> you have no idea how insulting sounds!
> It's the ffmpeg-user list, what d'you expect - technical discussion?  

common sense?
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Re: [FFmpeg-user] unsubscribe

[Phil Rhodes via ffmpeg-user]

 >> Please do not be so insulting

> you have no idea how insulting sounds!
It's the ffmpeg-user list, what d'you expect - technical discussion?  
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Re: [FFmpeg-user] Efficiently doing thousands of edits?

[John Hawkinson]

Carl Eugen Hoyos  wrote on Wed, 10 Apr 2019
at 01:13:17 +0200 in 
:

> ffmpeg, the command line application, is not a video editor. FFmpeg,
> the project, provides libraries that can be used by video editor software.

Thanks, Carl Eugen. What would you recommend for video editing tools that use 
ffmpeg's libraries?
I admit most of my experience with video editing software has been with 
commercial GUI projects that are not great for tasks like this.

I guess I could use the blackdetect filter to produce an EDL and run that 
through a commerical GUI video editor, but...well, what woudl you recomend for 
using ffmpeg's libraries? That's not something I'm very familiar with.

Thanks.

--
jh...@alum.mit.edu
John Hawkinson
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Re: [FFmpeg-user] an issue on decoding a mxf xavc long gop file.

[Carl Eugen Hoyos]

2019-04-10 0:24 GMT+02:00, Yufei He :
> On 04/08/2019 02:03 PM, Carl Eugen Hoyos wrote:
>> 2019-04-08 18:56 GMT+02:00, Yufei He :
>>> On 04/07/2019 05:37 PM, Carl Eugen Hoyos wrote:
 2019-04-05 17:03 GMT+02:00, Yufei He :
> I use avctx->framerate in my codec.
 Why?

 I am not claiming that there is no bug (I opened a ticket)
 but I don't see why you need the value, even more so
 if there is not issue with the native decoder.
>>> The chip needs frame rate to be initialized properly.
>> Does that mean that only (strict) cfr is supported by the chip?
>>

> Chip just needs frame rate to get initialized

So this is only a bug in the chip or the driver
because the initialization data is not used?

> it can go as fast as possible.
>
> I have a question:
>
> In line 809 of file ffmpeg_opt.c
>
>  // avformat_find_stream_info() doesn't set this for us
> anymore.
>  ist->dec_ctx->framerate = st->avg_frame_rate;
>
> Why is avg_frame_rate assigned to  ist->dec_ctx->framerate ?

> Why not st->r_frame_rate;

Doesn't the documentation answer this question?

Carl Eugen
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Re: [FFmpeg-user] Efficiently doing thousands of edits?

[Carl Eugen Hoyos]

2019-04-10 0:36 GMT+02:00, John Hawkinson :

[...]

Since this is apparently non-obvious:
ffmpeg, the command line application, is not a video editor. FFmpeg,
the project, provides libraries that can be used by video editor software.

Carl Eugen
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[FFmpeg-user] Efficiently doing thousands of edits?

[John Hawkinson]

Hi.

I have a multi-camera video (hard-coded burned into quadrants) where one camera 
frequently glitches to black, which is very distracting. I'd like to fix the 
video so the black flashing doesn't occur, the obvious way is to hold the last 
frame prior to each selection of black.

I'm going to describe what I did and invite commentary on how I could have done 
it better, and also describe where I'm now stuck on what seems to be a 
performance problem.

You can see this problem at https://youtu.be/K2UUQAy3NxI?t=2643 from 44:03 to 
44:13.

I took that ten-second chunk to experiment on, and it seemed like I could use 
the "blackdetect" filter to find these frames, and then use the trim, loop, and 
concat filters to hold the last good frame. This was frustrating to set up 
because it was the loop filter parameters in frame count but blackdetect 
reports them in time, and trim seems like it should take them both ways, but 
using frames didn't work for me initially.

# Getting a 10-second chunk from the origin of this video:
ffmpeg -ss 44:03 \
-i  
'http://usccameraspd.edgesuite.net/mm/flvmedia/3697/b/r/6/br6fmo56_ja85a1r2_h264_2328K.mp4'
 \
-t 10 -c copy start.mkv

I spent...way too much time trying to figure out how to run the "blackdetect" 
filter properly and get the data out. It
seems like an ffmpeg bug that doing it this way (obviously crude, but should 
work) is a trap for the unwary:

# Running blackdetect and grepping the ffmpeg output, naively
ffmpeg -i start.mkv -vf blackdetect=d=0.016:pic_th=0.7 \
-f null /dev/null 2>&1 |
grep blackdetect

The trap is if you run it through "cat -vet" you'll see you get a blackdetect 
log line joined with a frame output log line:

frame=  270 fps=0.0 q=-0.0 size=N/A time=00:00:09.14 bitrate=N/A 
speed=18.3x^M[blackdetect @ 0x7f806cc0b000] black_start:9.076 
black_end:9.409 black_duration:0.333$

This is resolvable with

# Running blackdetect and grepping the ffmpeg output, corrected
ffmpeg -i start.mkv -vf blackdetect=d=0.016:pic_th=0.7 \
-f null /dev/null 2>&1 |
tr \\015 \\012 |
grep blackdetect

but that just feels sketchy. Is that a bug?

Ultimatley I ended up doing it like this:

# Running blackdetect with ffprobe:
ffprobe -f lavfi -i 'movie=start.mkv,blackdetect=d=0.016:pic_th=0.7' \
-show_entries frame_tags=lavfi.black_start,lavfi.black_end \
-of 'flat=s=\ ' -v quiet > detect.txt

Which produces pretty nice output that comes with a frame count (yay, less 
math!):

frames frame 3 tags lavfi_black_start="0.1"
frames frame 12 tags lavfi_black_end="0.4"
frames frame 17 tags lavfi_black_start="0.567"
...

although it never produces the final lavi_black_end. Now does it give the 
black_duration parameter (but of course we can calculate it).

Next, to construct a filtergraph to handle this.

I also found it tough to see exactly what was going on. I ended up burning 
frame numbers and times into the frames with:

# Burning timetamps and frame numbers into frames for diagnostics
ffmpeg -i start.mkv \
-vf 'drawtext=textfile=text:fontsize=100:fontcolor=white' \
marked.mkv

where "text" was a file containing: "F: %{n} %{pts:flt} %{pts:hms}". I didn't 
have the patience to figure out what level of quoting was necessary to make 
this work on the command line.

Having that allowed me to single-frame step through the output to make sure 
that the edits were frame-accurate. The easiest tool for that proofing seemed 
to be "mpv", as:

# Proofing a file frame-by-frame
mpv --osd-fractions --pause \
--script-opts 'osc-visibility=always,osc-timems=yes' \
file.mkv

I would have liked to use ffplay, as it would make it a lot easier to test 
filtergraph expressions, but I couldn't find an equivalent of --pause, or 
on-screen display of the times. Or single frame advance.

After some messing around, this filtergraph seemed to be sufficient to address 
the first three glitches in my sample, and give me a pattern for improvement:

# Apply trim/loop/setpts -> concat filtergraph
ffmpeg -v info \
   -i marked.mkv \
   -filter_complex \ "
[0:v]trim=0.000:0.100,loop=09:1:2[a];
[0:v]trim=0.400:0.567,loop=09:1:4,setpts=PTS-STARTPTS[b];
[0:v]trim=0.868:1.969,loop=10:1:32,setpts=PTS-STARTPTS[c];
[0:v]trim=2.302:5,setpts=PTS-STARTPTS[Z];
[a][b][c][Z]concat=4" \
-y p4.mkv

I was a little puzzled why it was necessary to apply the setpts filter to each 
trimmed component, rather than to the result of the concat filter. Maybe I 
don't understand how the setpts filter works, but I'm puzzled why concat needs 
consistent PTS metadata on input?

Anyhow, the result was I scripted this, probably not in the best way:

# Prouce filtergraph from the blackdetect output (flat format)
< detect.txt sed 's/[="]/ /g' | awk '
BEGIN{ n=0;};
/black_start/{ st[n]=$6; sf[n]=$3 };
/black_end/  { et[n]=$6; ef[n]=$3; n++ };
  

Re: [FFmpeg-user] an issue on decoding a mxf xavc long gop file.

[Yufei He]

On 04/08/2019 02:03 PM, Carl Eugen Hoyos wrote:
> 2019-04-08 18:56 GMT+02:00, Yufei He :
>> On 04/07/2019 05:37 PM, Carl Eugen Hoyos wrote:
>>> 2019-04-05 17:03 GMT+02:00, Yufei He :
 I use avctx->framerate in my codec.
>>> Why?
>>>
>>> I am not claiming that there is no bug (I opened a ticket)
>>> but I don't see why you need the value, even more so
>>> if there is not issue with the native decoder.
>> The chip needs frame rate to be initialized properly.
> Does that mean that only (strict) cfr is supported by the chip?
>
> Carl Eugen
Chip just needs frame rate to get initialized, it can go as fast as 
possible.

I have a question:

In line 809 of file ffmpeg_opt.c

     // avformat_find_stream_info() doesn't set this for us anymore.
     ist->dec_ctx->framerate = st->avg_frame_rate;

Why is avg_frame_rate assigned to  ist->dec_ctx->framerate ?
Why not st->r_frame_rate;

Thanks.

Yufei.
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Re: [FFmpeg-user] unsubscribe

[Reindl Harald]

Am 09.04.19 um 22:53 schrieb Kieran O Leary:
> On Tue, 9 Apr 2019, 21:13 Reindl Harald,  wrote:
> 
>> Am 09.04.19 um 20:50 schrieb Ted Park:
 Am 09.04.19 um 10:56 schrieb dben...@bezeqint.net:

 hell you have the instructions on bottom of every single message
>>>
>>> It seems he was trying to follow them, but made a mistake. If you’re
>> still here, you need to email ffmpeg-user-requ...@ffmpeg.org > ffmpeg-user-requ...@ffmpeg.org>, not the mailing list itself dbenari
>>
>> what mistake can you make in case of "email
>> ffmpeg-user-requ...@ffmpeg.org with subject unsubscribe" when you own a
>> sane mind
> 
> 
> Please do not be so insulting

you have no idea how insulting sounds!


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Re: [FFmpeg-user] unsubscribe

[Kieran O Leary]

On Tue, 9 Apr 2019, 21:13 Reindl Harald,  wrote:

>
>
> Am 09.04.19 um 20:50 schrieb Ted Park:
> >> Am 09.04.19 um 10:56 schrieb dben...@bezeqint.net:
> >>
> >> hell you have the instructions on bottom of every single message
> >
> >
> >
> > It seems he was trying to follow them, but made a mistake. If you’re
> still here, you need to email ffmpeg-user-requ...@ffmpeg.org  ffmpeg-user-requ...@ffmpeg.org>, not the mailing list itself dbenari
>
> what mistake can you make in case of "email
> ffmpeg-user-requ...@ffmpeg.org with subject unsubscribe" when you own a
> sane mind


Please do not be so insulting.
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Re: [FFmpeg-user] How to send all the audios and subtitles tracks available

[Moritz Barsnick]

Hi Robinson,

On Tue, Apr 09, 2019 at 20:02:10 +, Robinson Robinson wrote:
> How to send all the audios and subtitles tracks available in the video source?
> My line command is same that
> command=/usr/local/bin/ffmpeg -probesize 200 -correct_ts_overflow 1 -i 
> http://ip:port/stream1 -threads auto -acodec libfaac -map 0:0 -map 0:2 -vpre 
> ffmpeg-hwaccel-hq -s 720x576 -ab 96k -r 30 -vb 1824k -maxrate 1824k -bufsize 
> 1824k -aspect 16:9 -filter:v yadif -f flv rtmp://ipserver:port/live/stream1

Note that you are using "-map 0:0 -map 0:2", which makes ffmpeg select
exactly those two and only those two streams from the input.

If you omit any "-map" options, ffmpeg will select one stream of each
type fro mthe input (by its own measure of what is "best" or most
approriate).

If you specify "-map 0", ffmpeg will select *all* streams (from the
first input "0"). Note that this means that ffmpeg will also try to map
e.g. unknown data streams, and that the output format may not support
these.

This is described in more detail in this chapter of the documentation:
https://ffmpeg.org/ffmpeg.html#toc-Stream-selection


Just an additional small hint: Your ffmpeg is probably quite out of
date if it still supports libfaac. We recommend using a very recent
version, especially if you encounter problems. (And then, please also
provide the complete, uncut console output of your command.)

Cheers,
Moritz
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Re: [FFmpeg-user] unsubscribe

[dbenari]

Thanks. Sorry.

-Original Message-
From: ffmpeg-user  On Behalf Of Reindl Harald
Sent: Tuesday, 9 April 2019 23:13
To: ffmpeg-user@ffmpeg.org
Subject: Re: [FFmpeg-user] unsubscribe



Am 09.04.19 um 20:50 schrieb Ted Park:
>> Am 09.04.19 um 10:56 schrieb dben...@bezeqint.net:
>>
>> hell you have the instructions on bottom of every single message
> 
> 
> 
> It seems he was trying to follow them, but made a mistake. If you’re 
> still here, you need to email ffmpeg-user-requ...@ffmpeg.org 
> , not the mailing list itself 
> dbenari

what mistake can you make in case of "email ffmpeg-user-requ...@ffmpeg.org with 
subject unsubscribe" when you own a sane mind?
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Re: [FFmpeg-user] unsubscribe

[Reindl Harald]

Am 09.04.19 um 20:50 schrieb Ted Park:
>> Am 09.04.19 um 10:56 schrieb dben...@bezeqint.net:
>>
>> hell you have the instructions on bottom of every single message
> 
> 
> 
> It seems he was trying to follow them, but made a mistake. If you’re still 
> here, you need to email ffmpeg-user-requ...@ffmpeg.org 
> , not the mailing list itself dbenari

what mistake can you make in case of "email
ffmpeg-user-requ...@ffmpeg.org with subject unsubscribe" when you own a
sane mind?
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[FFmpeg-user] How to send all the audios and subtitles tracks available

[Robinson Robinson]

Hello everybody!

How to send all the audios and subtitles tracks available in the video source?
My line command is same that
command=/usr/local/bin/ffmpeg -probesize 200 -correct_ts_overflow 1 -i 
http://ip:port/stream1 -threads auto -acodec libfaac -map 0:0 -map 0:2 -vpre 
ffmpeg-hwaccel-hq -s 720x576 -ab 96k -r 30 -vb 1824k -maxrate 1824k -bufsize 
1824k -aspect 16:9 -filter:v yadif -f flv rtmp://ipserver:port/live/stream1

The MAP STREAM

 Metadata:
  service_name: Stream1
  service_provider:
Stream #0:0[0x730]: Video: h264 (High) ([27][0][0][0] / 0x001B), 
yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], Closed Captions, 29.97 fps, 
59.94 tbr, 90k tbn, 59.94 tbc
Stream #0:1[0x731](eng): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, 
5.0(side), fltp, 384 kb/s
Stream #0:2[0x732](dub): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, 
fltp, 192 kb/s
Stream #0:3[0x734](por): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)


Thanks

[https://ipmcdn.avast.com/images/icons/icon-envelope-tick-green-avg-v1.png]
 Virus-free. 
www.avg.com
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Re: [FFmpeg-user] Unable to identify flicker video

[Ted Park]

> On Apr 9, 2019, at 2:34 AM, saurav suman  wrote:
> 
> Hi Team,
> 
> I have downloaded the latest FFmpeg.exe file from the FFmpeg website. The
> problem is FFmpeg is unable to identify the flickers present in the video.
> Flicker present in the video is clearly visible by the naked eye.
> 
> If required, I can share the recorded file.
> 
> Regards,
> Saurav

Can you elaborate on what a flicker is, exactly? Also what you mean by 
identifying them.
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Re: [FFmpeg-user] CBR Coding with force_key frames

[Ted Park]

Set the verbosity level lower (higher?), try -v info instead of -v error. That 
might be suppressing everything except errors.
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Re: [FFmpeg-user] unsubscribe

[Ted Park]

> Am 09.04.19 um 10:56 schrieb dben...@bezeqint.net:
> 
> hell you have the instructions on bottom of every single message



It seems he was trying to follow them, but made a mistake. If you’re still 
here, you need to email ffmpeg-user-requ...@ffmpeg.org 
, not the mailing list itself dbenari.


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Re: [FFmpeg-user] CBR Coding with force_key frames

[saurav suman]

Hi Carl,

As required please find the attached file.
I have shared the console command (copied from the CMD prompt) and Batch
file in notepad(.bat file to call the ffmpeg.exe file) . Unable to attach
the error log file because it is empty(0 bytes)

File1: Console_CMD[1] : command copied from the command prompt in
Notpad(text format).
File2: BatchFile(FFmpeg call) : Copied batch file command in Notepad(text
format)

Regards,
Saurav

On Tue, Apr 9, 2019 at 5:17 PM Carl Eugen Hoyos  wrote:

> 2019-04-09 11:59 GMT+02:00, Nick :
> > Can it happen that force_key_frames option will destroy a
> > good cbr 2-pass coding?
>
> Command lines and complete, uncut console output missing.
>
> (Changing parameters over passes will affect quality.)
>
> Carl Eugen
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C:\ffmpeg>title Test

C:\ffmpeg>set "dir1=C:\Users\38934\Desktop"

C:\ffmpeg>echo running loop test
running loop test

C:\ffmpeg>FOR %X in ("C:\Users\38934\Desktop\00.00.00-00.05.00[A][0@0][0].mp4") 
DO ffmpeg.exe -v error -i %X -f null -  1>error.log 2>&1

C:\ffmpeg>ffmpeg.exe -v error -i 
"C:\Users\38934\Desktop\00.00.00-00.05.00[A][0@0][0].mp4" -f null -  
1>error.log 2>&1

C:\ffmpeg>echo Done
Done

C:\ffmpeg>pause
Press any key to continue . . .

title Test
set "dir1=C:\Users\38934\Desktop"

echo running loop test 
FOR %%X in ("%dir1%\12.01.01-12.02.20[R][0@0][0].dav") DO ffmpeg.exe -v error 
-i %%X -f null - >error.log 2>&1
echo Done
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Re: [FFmpeg-user] CBR Coding with force_key frames

[Carl Eugen Hoyos]

2019-04-09 11:59 GMT+02:00, Nick :
> Can it happen that force_key_frames option will destroy a
> good cbr 2-pass coding?

Command lines and complete, uncut console output missing.

(Changing parameters over passes will affect quality.)

Carl Eugen
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[FFmpeg-user] CBR Coding with force_key frames

[Nick]

Can it happen that force_key_frames option will destroy a good cbr 
2-pass coding?

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Re: [FFmpeg-user] unsubscribe

[Reindl Harald]

Am 09.04.19 um 10:56 schrieb dben...@bezeqint.net:
>  
> 
> ___
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hell you have the instructions on bottom of every single message





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Re: [FFmpeg-user] Unable to identify flicker video

[Moritz Barsnick]

On Tue, Apr 09, 2019 at 12:04:08 +0530, saurav suman wrote:

> The problem is FFmpeg is unable to identify the flickers present in
> the video. Flicker present in the video is clearly visible by the
> naked eye.

Please show us the actual ffmpeg command line you used, and its
complete, uncut console output (text copy, not screenshot, please).
This is to help understand what you are doing, and furthermore ffmpeg
provides a lot of useful information in its logs.

> If required, I can share the recorded file.

Feel free to upload the input file to a file sharer of your choice (or
Google Drive, Dropbox, whatever) and provide the link here.

Thanks,
Moritz
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Re: [FFmpeg-user] Unable to identify flicker video

[saurav suman]

Hi Team,

I have downloaded the latest FFmpeg.exe file from the FFmpeg website. The
problem is FFmpeg is unable to identify the flickers present in the video.
Flicker present in the video is clearly visible by the naked eye.

If required, I can share the recorded file.

Regards,
Saurav
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