Re: [FFmpeg-user] Generate MPEG Transport stream from audio files only

[Pierre Pasquet]

I’m confused.
What does $ ffmpeg -i udp://127.0.0.1:  actually do? 
Is it a substitute to mediastreamsegmenter? 

Pierre

> On 9 Mar 2018, at 18:44, Moritz Barsnick <barsn...@gmx.net> wrote:
> 
> On Fri, Mar 09, 2018 at 17:34:05 +, Pierre Pasquet wrote:
>> Why can’t I just do the same for a stream segmenter? Doesn’t FFMpeg provide 
>> a way to create a MPEG-2 transport stream with Audio only? 
> 
> Yes it does. If you launch your audio-only ffmpeg stream (but not your
> segmenter), and then separately issue a "receiver" as such:
> 
> $ ffmpeg -i udp://127.0.0.1:
> 
> you will see that you receive an mpegts stream with only AAC audio.
> (Alas, when trying, my ffmpeg "receiver" took almost 10 seconds to pick
> up the stream.)
> 
> Perhaps the segmenter is picky about the TS format, and ffmpeg isn't
> complying to its requirements. *shrug*
> 
> Moritz
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Re: [FFmpeg-user] Generate MPEG Transport stream from audio files only

[Pierre Pasquet]

I’ll have a look. What I don’t understand is that for VOD playback, I use 
mediafilesegmenter -f /Library/WebServer/Documents/live test.aac  and it works 
perfectly fine ! The playlist is created with the relevant .aac segment files. 

Why can’t I just do the same for a stream segmenter? Doesn’t FFMpeg provide a 
way to create a MPEG-2 transport stream with Audio only? 

Thanks, 

> On 9 Mar 2018, at 17:30, Carl Zwanzig <c...@tuunq.com> wrote:
> 
> On 3/9/2018 7:05 AM, Pierre Pasquet wrote:
>> I have tried your solution and here’s what I get : Unable to find a suitable 
>> output format for 'color=s=:c=black:r='
>> color=s=:c=black:r=: Invalid argument
> 
> You can't just drop in "color=s=$outFormat:c=black:r=$videoRate" and expect 
> it to work unless variables outFormat and videoRate are defined. Take a look 
> at the color filter docs for the relevant values. (For me, both outFormat and 
> videoRate are usually "ntsc").
> 
> z!
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Re: [FFmpeg-user] Generate MPEG Transport stream from audio files only

[Pierre Pasquet]

Hello, 

I have tried your solution and here’s what I get : Unable to find a suitable 
output format for 'color=s=:c=black:r='
color=s=:c=black:r=: Invalid argument


The full command was : ffmpeg -re -i test.aac 
color=s=$outFormat:c=black:r=$videoRate -vcodec copy -vbsf h264_mp4toannexb 
-acodec copy -f mpegts udp://127.0.0.1: 

Thanks, 

Pierre

> On 9 Mar 2018, at 03:51, Carl Zwanzig  wrote:
> 
> On 3/8/2018 8:17 AM, Moritz Barsnick wrote:
>> As Carl Eugen tried to point out: What is missing is that you provide
>> your actual (non-working) command line and its complete, uncut console
>> output.
> 
> One thing missing is some directed speculation even before the cmd line is 
> sent; it's a valuable part of troubleshooting and helps those asking to learn.
> 
>   
> To the OP-
> You might try providing dummy video to go with the audio (I know some 
> software doesn't deal well when there is no video stream).
> 
> I think all you need to add something like
> 
>  -i color=s=$outFormat:c=black:r=$videoRate
> 
> but I haven't tried it.
> 
> z!
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Re: [FFmpeg-user] Generate MPEG Transport stream from audio files only

[Pierre Pasquet]

All right, here’s a detailed presentation of what’s happening : 

First of all, everything is on local. I am using the default Mac OS apache 
server

- I launch a process that listens on port  and segments incoming media for 
deployment using HTTP Live Streaming with : 
mediastreamsegmenter -f /Library/WebServer/Documents/live 127.0.0.1:

In theory, when receiving an input file, the segmenter should generate a 
playlist .m3u8 and create subsequent .aac files (because we are dealing only 
with audio)

- Then, I **try** to wrap the audio in a MPEG-2 transport stream and send it 
over UDP to port  with the following command (on a different terminal tab) 
: 
ffmpeg -re -i test.aac -vcodec copy -vbsf h264_mp4toannexb -acodec copy -f 
mpegts udp://127.0.0.1:

At this point, here’s what happens : 

- on the segmenter tab : 

Mar  9 2018 00:59:49.627: audio pid set at 100
Mar  9 2018 00:59:49.928: audio pid change to 100
Mar  9 2018 00:59:50.396: audio pid change to 100
Mar  9 2018 00:59:50.718: audio pid change to 100

And so on … (same prompt)

- on the ffmpeg tab : 

[aac @ 0x7fd242009400] Estimating duration from bitrate, this may be inaccurate
Input #0, aac, from 'test.aac':
  Duration: 00:01:08.37, bitrate: 139 kb/s
Stream #0:0: Audio: aac (LC), 44100 Hz, stereo, fltp, 139 kb/s
[mpegts @ 0x7fd24200a000] frame size not set
Output #0, mpegts, to 'udp://127.0.0.1:':
  Metadata:
encoder : Lavf57.83.100
Stream #0:0: Audio: aac (LC), 44100 Hz, stereo, fltp, 139 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
size=  75kB time=00:00:04.06 bitrate= 151.0kbits/s speed=   1x 


At this point, there should be a .m3u8 playlist file under 
/Library/WebServer/Documents/live and appropriate .aac files. But it’s not the 
case. 
Eventually, the ffmpeg tab will return this : 

video:0kB audio:1165kB subtitle:0kB other streams:0kB global headers:0kB muxing 
overhead: 12.020084%

And the segmenter tab will return : 

Mar  9 2018 01:02:00.582: Warning: no data received for 0.5 seconds.
Mar  9 2018 01:02:01.083: Warning: no data received for 1.0 seconds.
Mar  9 2018 01:02:01.583: Warning: no data received for 1.5 seconds.
Mar  9 2018 01:02:02.084: Warning: no data received for 2.0 seconds.
Mar  9 2018 01:02:02.589: Warning: no data received for 2.5 seconds.
Mar  9 2018 01:02:03.090: Warning: no data received for 3.0 seconds.
Mar  9 2018 01:02:03.591: Warning: no data received for 3.5 seconds.
Mar  9 2018 01:02:04.095: Warning: no data received for 4.0 seconds.


But still no files were created. 

I know that the ffmpeg command is not write because it applies to video files, 
but I can’t come up with an equivalent command for audio only! 

Thanks for your help, 

Pierre

> On 8 Mar 2018, at 16:17, Moritz Barsnick <barsn...@gmx.net> wrote:
> 
> On Thu, Mar 08, 2018 at 14:25:54 +0000, Pierre Pasquet wrote:
>> Not sure to identify what is missing. This command works for a .m4v file and 
>> doesn’t for a .aac file located in the same directory.
> 
> As Carl Eugen tried to point out: What is missing is that you provide
> your actual (non-working) command line and its complete, uncut console
> output. These provide a lot of valuable information, and will help to
> analyze your issue.
> 
> Cheers,
> Moritz
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Re: [FFmpeg-user] Generate MPEG Transport stream from audio files only

[Pierre Pasquet]

Not sure to identify what is missing. This command works for a .m4v file and 
doesn’t for a .aac file located in the same directory.
How can it be? 

Thanks for your help, 

> On 8 Mar 2018, at 11:02, Carl Eugen Hoyos <ceffm...@gmail.com> wrote:
> 
> 2018-03-07 19:16 GMT+01:00, Pierre Pasquet <pierrep...@icloud.com>:
> 
>> However, It doesn't work with a AAC file.
> 
> Command line and complete, uncut console output missing.
> 
> Carl Eugen
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[FFmpeg-user] Generate MPEG Transport stream from audio files only

[Pierre Pasquet]

Hello all, 

I have set up a HLS server and asked it to listen to localhost on port  
with this command `mediastreamsegmenter -f /Library/WebSever/Documents/live 
127.0.0.1 -audio-only`. This is a macOS tool.

I have found a command to create an input stream from a **video** file and send 
it to the `mediastreamsegmenter`, as follow : 

ffmpeg 
-re -i video.m4v 
-vcodec copy 
-vbsf h264_mp4toannexb 
-acodec copy 
-f mpgets udp://127.0.0.1:

However, It doesn't work with a AAC file. How can I send an audio-only file. (I 
really don't care about the image) to a segmenter? 

Thanks for your help, 

Best, 

Pierre

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