Re: [FFmpeg-user] Multithreaded Asynchronous Encoding/Muxing

[Lou Logan]

On Tue, Feb 26, 2019, at 1:33 PM, BIGLER Don (Framatome) wrote:
> All,
> 
> I am writing an application that displays, encodes, and muxes live 
> video using ffmpeg as the backend.  The audio and video encoding occurs 
> asynchronously in the background, each in its own thread, such that the 
> encoded packets arrive to the av_interleaved_write_frame() function 
> call at different times.
[...]

This mailing list (ffmpeg-user) is only for questions involving the FFmpeg 
command-line tools (ffmpeg, ffplay, ffprobe). Usage questions involving the 
FFmpeg libraries (libavcodec, libavformat, etc) should be asked at libav-user.
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[FFmpeg-user] Multithreaded Asynchronous Encoding/Muxing

[BIGLER Don (Framatome)]

All,

I am writing an application that displays, encodes, and muxes live video using 
ffmpeg as the backend.  The audio and video encoding occurs asynchronously in 
the background, each in its own thread, such that the encoded packets arrive to 
the av_interleaved_write_frame() function call at different times.  H.264 video 
encoding by itself works fine.  However when I add audio, the audio is out of 
sync from the video even though the audio and video pts are in sync (from 
avdevice using the matroska muxer).  The cause of the problem is not clear to 
me.  Specifically, here are my questions:


1. Can the av_interleaved_write_frame() function handle multithreaded 
asynchronous calls for audio and video streams?

2. The transcoding example uses a filter graph using buffer/abuffer 
filters.  My current implementation does not use the buffer/abuffer filters 
because I am not applying any filters before encoding.  Are they required for 
my situation?

3. The encoding happens randomly within the stream such that the first pts 
received by the muxer is not zero.  Is this required?

I will greatly appreciate any assistance!

Regards,
Don Bigler
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Re: [FFmpeg-user] How to copy all of 5 audio streams to mp4 file

[Hans Carlson]

On Sun, 24 Feb 2019, Moritz Barsnick wrote:


On Sun, Feb 24, 2019 at 01:19:20 +0100, Ulf Zibis wrote:


Would you be capable to create such a patch? I really would appreciate
this.


Attached. Use at your own risk. I only merged the changes and fixed
obvious merge issues.


This is great.  What's the odds this (or something similar to/based on 
this) could be added to the official ffmpeg code base?

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[FFmpeg-user] ffmpeg x11grab on Xvfb interferring with SDL-1.2 app run from docker image

[lynx . abraxas]

Hi!


Are there known issues when using ffmpeg x11grab to screen cast from Xvfb 
running an SDL-1.2 app (https://github.com/civctp2/civctp2 does not use OpenGL 
with SDL) from a docker image (inside GitLab CI)?
Screen casting with ffmeg x11grab from Xvfb running a java-GUI from a docker 
image (inside GitLab CI) works: 
https://gitlab.com/romangrothausmann/dind-sikuli/-/jobs/166447668/artifacts/file/start.mpg
and I was also able to use ffmpeg x11grab from X11 on my local PC when runing 
ctp2 from docker image
but when using the same command to record ctp2 on Xvfb the SDL canvas stays 
black. My guess is that x11grab somehow irritates SDL but only if run on Xvfb 
because ctp2 then issues this at startup:

The program 'ctp2' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadValue (integer parameter out of range for operation)'.
  (Details: serial 13 error_code 2 request_code 130 minor_code 3)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the --sync command line
   option to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)

Xvfb and ffmpeg cmds used:

Xvfb $DISPLAY -ac -listen tcp -screen 0 1280x1024x24 
ffmpeg -f x11grab -framerate 25 -video_size 1280x1024 -i $DISPLAY -v error  
${CI_JOB_NAME}.mpg &

see e.g. 
https://github.com/LynxAbraxas/ctp2DF/blob/c900843393c56c6378f175711045706fdfcc3499/.gitlab-ci.yml#L80


ffmpeg is from the alpine (extension of the dind docker image):
ffmpeg -version
ffmpeg version 3.4.4 Copyright (c) 2000-2018 the FFmpeg developers
built with gcc 6.4.0 (Alpine 6.4.0)
configuration: --prefix=/usr --enable-avresample --enable-avfilter 
--enable-gnutls --enable-gpl --enable-libass --enable-libmp3lame 
--enable-librtmp --enable-libvorbis --enable-libvpx --enable-libxvid 
--enable-libx264 --enable-libx265 --enable-libtheora --enable-libv4l2 
--enable-postproc --enable-pic --enable-pthreads --enable-shared 
--enable-libxcb --disable-stripping --disable-static --enable-vaapi 
--enable-vdpau --enable-libopus --disable-debug
libavutil  55. 78.100 / 55. 78.100
libavcodec 57.107.100 / 57.107.100
libavformat57. 83.100 / 57. 83.100
libavdevice57. 10.100 / 57. 10.100
libavfilter 6.107.100 /  6.107.100
libavresample   3.  7.  0 /  3.  7.  0
libswscale  4.  8.100 /  4.  8.100
libswresample   2.  9.100 /  2.  9.100
libpostproc54.  7.100 / 54.  7.100


Are there any special options to ffmpeg or SDL-1.2 (env-vars or inside code) 
that could solve this problem?
Any help or hints how to get this to work are very welcome.

Lynx

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Re: [FFmpeg-user] Growing file processing

[Ulf Zibis]

Hi Gregor,

please do not hijack threads, means, do not klick "answer" on an post of
another subject to start a new subject!

Thanks,

Ulf

Am 26.02.19 um 11:00 schrieb g.cem...@woody-technologies.com:
> Hello,
>
> Is there a way to transcode growing files with fmmpeg ?
>
> Here are the tests I did, with 2 instances of ffmpeg running
> simultaneously :
>
> 1 - Growing file generation faster than processing
> ffmpeg.exe -i input.mxf -c copy growing.mxf
> ffmpeg.exe -i growing.mxf output.mkv
>> Everything is OK.
>
> 2 - Growing file generation slower than processing
> ffmpeg.exe -i input.mxf growing.mkv
> ffmpeg.exe -i growing.mkv -c copy output.mkv
>> ffmpeg stops when it reaches the current end of the growing file.
>
> Any way to avoid this behavior ?
>
> Note : The growing file can be produced by ffmpeg but also by any
> other software.
>
> Thanks,
> Gregor.
>
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Re: [FFmpeg-user] impossible to read rtsp stream with the type h264

[ABDALLAH Moussa]

I found how with -rtsp_transport tcp.

Thanks you again.

> Le 26 févr. 2019 à 18:58, ABDALLAH Moussa  a 
> écrit :
> 
> Thanks you for these response.
> 
> [rtsp @ 0x39da4c0] UDP timeout, retrying with TCP
> 
> Did you try forcing tcp? It may help if a camera timeout is the issue.
> 
> How to force tcp?
> 
> Le 26 févr. 2019 à 18:52, Carl Eugen Hoyos 
> mailto:ceffm...@gmail.com>> a écrit :
> 
> 
> 
> Am 26.02.2019 um 18:07 schrieb ABDALLAH Moussa 
> mailto:moussa.abdal...@nexeya.com>>:
> 
> Hi,
> 
> I try to read a stream video with the command line : ffmpeg -i 
> rtsp://192.9.200.121/h264 -y -map 0 -t 5 -c copy -f matroska  _capture.mkv
> 
> And I get this error :
> 
> ffmpeg version 4.1.1 Copyright (c)
> 
> Please remember that only current FFmpeg git head is supported here.
> 
> 2000-2019 the FFmpeg developers
> built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-36)
> configuration:
> libavutil  56. 22.100 / 56. 22.100
> libavcodec 58. 35.100 / 58. 35.100
> libavformat58. 20.100 / 58. 20.100
> libavdevice58.  5.100 / 58.  5.100
> libavfilter 7. 40.101 /  7. 40.101
> libswscale  5.  3.100 /  5.  3.100
> libswresample   3.  3.100 /  3.  3.100
> 
> [rtsp @ 0x39da4c0] UDP timeout, retrying with TCP
> 
> Did you try forcing tcp? It may help if a camera timeout is the issue.
> 
> [rtsp @ 0x39da4c0] method SETUP failed: 454 Session Not Found
> [rtsp @ 0x39da4c0] Could not find codec parameters for stream 0 (Video: h264, 
> none, 1280x720): unspecified pixel format
> Consider increasing the value for the 'analyzeduration' and 'probesize' 
> options
> 
> These are the relevant lines, everything else is just a consequence.
> Consider increasing verbosity.
> 
> Carl Eugen
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Re: [FFmpeg-user] impossible to read rtsp stream with the type h264

[ABDALLAH Moussa]

Thanks you for these response.

[rtsp @ 0x39da4c0] UDP timeout, retrying with TCP

Did you try forcing tcp? It may help if a camera timeout is the issue.

How to force tcp?

Le 26 févr. 2019 à 18:52, Carl Eugen Hoyos 
mailto:ceffm...@gmail.com>> a écrit :



Am 26.02.2019 um 18:07 schrieb ABDALLAH Moussa 
mailto:moussa.abdal...@nexeya.com>>:

Hi,

I try to read a stream video with the command line : ffmpeg -i 
rtsp://192.9.200.121/h264 -y -map 0 -t 5 -c copy -f matroska  _capture.mkv

And I get this error :

ffmpeg version 4.1.1 Copyright (c)

Please remember that only current FFmpeg git head is supported here.

2000-2019 the FFmpeg developers
built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-36)
configuration:
libavutil  56. 22.100 / 56. 22.100
libavcodec 58. 35.100 / 58. 35.100
libavformat58. 20.100 / 58. 20.100
libavdevice58.  5.100 / 58.  5.100
libavfilter 7. 40.101 /  7. 40.101
libswscale  5.  3.100 /  5.  3.100
libswresample   3.  3.100 /  3.  3.100

[rtsp @ 0x39da4c0] UDP timeout, retrying with TCP

Did you try forcing tcp? It may help if a camera timeout is the issue.

[rtsp @ 0x39da4c0] method SETUP failed: 454 Session Not Found
[rtsp @ 0x39da4c0] Could not find codec parameters for stream 0 (Video: h264, 
none, 1280x720): unspecified pixel format
Consider increasing the value for the 'analyzeduration' and 'probesize' options

These are the relevant lines, everything else is just a consequence.
Consider increasing verbosity.

Carl Eugen
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Re: [FFmpeg-user] impossible to read rtsp stream with the type h264

[Carl Eugen Hoyos]

> Am 26.02.2019 um 18:07 schrieb ABDALLAH Moussa :
> 
> Hi,
> 
> I try to read a stream video with the command line : ffmpeg -i 
> rtsp://192.9.200.121/h264 -y -map 0 -t 5 -c copy -f matroska  _capture.mkv
> 
> And I get this error :
> 
> ffmpeg version 4.1.1 Copyright (c)

Please remember that only current FFmpeg git head is supported here.

> 2000-2019 the FFmpeg developers
>  built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-36)
>  configuration:
>  libavutil  56. 22.100 / 56. 22.100
>  libavcodec 58. 35.100 / 58. 35.100
>  libavformat58. 20.100 / 58. 20.100
>  libavdevice58.  5.100 / 58.  5.100
>  libavfilter 7. 40.101 /  7. 40.101
>  libswscale  5.  3.100 /  5.  3.100
>  libswresample   3.  3.100 /  3.  3.100

> [rtsp @ 0x39da4c0] UDP timeout, retrying with TCP

Did you try forcing tcp? It may help if a camera timeout is the issue.

> [rtsp @ 0x39da4c0] method SETUP failed: 454 Session Not Found
> [rtsp @ 0x39da4c0] Could not find codec parameters for stream 0 (Video: h264, 
> none, 1280x720): unspecified pixel format
> Consider increasing the value for the 'analyzeduration' and 'probesize' 
> options

These are the relevant lines, everything else is just a consequence.
Consider increasing verbosity.

Carl Eugen
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Re: [FFmpeg-user] impossible to read rtsp stream with the type h264

[Moritz Barsnick]

On Tue, Feb 26, 2019 at 17:07:17 +, ABDALLAH Moussa wrote:
> I try to read a stream video with the command line : ffmpeg -i 
> rtsp://192.9.200.121/h264 -y -map 0 -t 5 -c copy -f matroska  _capture.mkv

Do you need "-f matroska"? It's the default for ".mkv" files.

> Stream #0:0: Video: h264, none, 1280x720, 90k tbr, 90k tbn, 180k tbc
> Stream #0:1: Data: none
> [matroska @ 0x3a20fc0] Only audio, video, and subtitles are supported for 
> Matroska.
> Could not write header for output file #0 (incorrect codec parameters ?): 
> Invalid argument

It tells you in really clear words here: With "-map 0", you tell ffmpeg
to map all streams, and one of them is "Data", and Matroska refuses to
accept data streams.

You could instead do "-map 0:v [-map 0:a]", or you can surpress data
streams with "-map 0 -dn".

Cheers,
Moritz
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Re: [FFmpeg-user] Growing file processing

[Moritz Barsnick]

On Tue, Feb 26, 2019 at 17:51:09 +0100, g.cem...@woody-technologies.com wrote:
> Thanks, very good idea, but I'm under Windows and can't find a tail tool 
> with the  -c +1 -F options ...

Well, Windows has always been pretty braindead out of the box, where
Unix has all the funky tools.

As Carl mentioned, you can grab a Windows version of GNU tail
somewhere. Also, there seems to be a Tail.exe in the Resource Kit
Tools:
https://www.microsoft.com/en-us/download/details.aspx?id=17657

And Windows PowerShell, which should be included with modern versions
(?) has an equivalent:
https://stackoverflow.com/a/4427285/3974309
(and plenty of other suggestions under this SO question).

I'm afraid ffmpeg is not capable of ignoring EOF. (I even believe the
codebase is not prepared to easily introduce an option for that.)

Good luck,
Moritz
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[FFmpeg-user] impossible to read rtsp stream with the type h264

[ABDALLAH Moussa]

Hi,

I try to read a stream video with the command line : ffmpeg -i 
rtsp://192.9.200.121/h264 -y -map 0 -t 5 -c copy -f matroska  _capture.mkv

And I get this error :

ffmpeg version 4.1.1 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-36)
  configuration:
  libavutil  56. 22.100 / 56. 22.100
  libavcodec 58. 35.100 / 58. 35.100
  libavformat58. 20.100 / 58. 20.100
  libavdevice58.  5.100 / 58.  5.100
  libavfilter 7. 40.101 /  7. 40.101
  libswscale  5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
[rtsp @ 0x39da4c0] UDP timeout, retrying with TCP
[rtsp @ 0x39da4c0] method SETUP failed: 454 Session Not Found
[rtsp @ 0x39da4c0] Could not find codec parameters for stream 0 (Video: h264, 
none, 1280x720): unspecified pixel format
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, rtsp, from 'rtsp:// 192.9.200.121/h264':
  Metadata:
title   : h264
comment : Network Camera Streamer
  Duration: 00:00:00.00, start: 0.00, bitrate: N/A
Stream #0:0: Video: h264, none, 1280x720, 90k tbr, 90k tbn, 180k tbc
Stream #0:1: Data: none
[matroska @ 0x3a20fc0] Only audio, video, and subtitles are supported for 
Matroska.
Could not write header for output file #0 (incorrect codec parameters ?): 
Invalid argument
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Last message repeated 1 times
[root@localhost Téléchargements]#

Is it a problem from my camera ?

Thank you for your help,

Moussa.

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Re: [FFmpeg-user] Growing file processing

[Carl Zwanzig]

On 2/26/2019 8:51 AM, g.cem...@woody-technologies.com wrote:
Thanks, very good idea, but I'm under Windows and can't find a tail tool 
with the  -c +1 -F options ...

Somebody has another idea ?


Maybe not the best of solutions, but msys2 has a 'tail' command which 
supports that option (and which will run in a windows cmd shell). You'll 
have to install a minimal msys2 to get it, but that isn't difficult 
(https://www.msys2.org/).


z!
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Re: [FFmpeg-user] Growing file processing

[g . cemeli]

Le 26.02.2019 13:20, Moritz Barsnick a écrit :
On Tue, Feb 26, 2019 at 11:00:40 +0100, g.cem...@woody-technologies.com 
wrote:

2 - Growing file generation slower than processing
ffmpeg.exe -i input.mxf growing.mkv
ffmpeg.exe -i growing.mkv -c copy output.mkv
> ffmpeg stops when it reaches the current end of the growing file.

Any way to avoid this behavior ?


My second recommendation with "tail" here works for me:
https://lists.ffmpeg.org/pipermail/ffmpeg-user/2016-July/032874.html

Moritz


Thanks, very good idea, but I'm under Windows and can't find a tail tool 
with the  -c +1 -F options ...

Somebody has another idea ?
Gregor.
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Re: [FFmpeg-user] Growing file processing

[Moritz Barsnick]

On Tue, Feb 26, 2019 at 11:00:40 +0100, g.cem...@woody-technologies.com wrote:
> 2 - Growing file generation slower than processing
> ffmpeg.exe -i input.mxf growing.mkv
> ffmpeg.exe -i growing.mkv -c copy output.mkv
> > ffmpeg stops when it reaches the current end of the growing file.
> 
> Any way to avoid this behavior ?

My second recommendation with "tail" here works for me:
https://lists.ffmpeg.org/pipermail/ffmpeg-user/2016-July/032874.html

Moritz
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[FFmpeg-user] Growing file processing

[g . cemeli]

Hello,

Is there a way to transcode growing files with fmmpeg ?

Here are the tests I did, with 2 instances of ffmpeg running 
simultaneously :


1 - Growing file generation faster than processing
ffmpeg.exe -i input.mxf -c copy growing.mxf
ffmpeg.exe -i growing.mxf output.mkv

Everything is OK.


2 - Growing file generation slower than processing
ffmpeg.exe -i input.mxf growing.mkv
ffmpeg.exe -i growing.mkv -c copy output.mkv

ffmpeg stops when it reaches the current end of the growing file.


Any way to avoid this behavior ?

Note : The growing file can be produced by ffmpeg but also by any other 
software.


Thanks,
Gregor.

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Re: [FFmpeg-user] Timestamps are unset

[Tom Worton]

Carl,

In your last email you said that I was missing the complete uncut console 
output. If I am doing it correct. I replied with the missing information. Do 
you have any further advice?

Aside from stating that I did not include the console output information, you 
said "If you are just worried about a warning message:
You are not the intended recipient (and there is
nothing you can do about it)." I dont understand what you are saying here. Are 
you saying that the warning is just a warning and the data is really fine or 
there are legitimate errors and there is nothing I can do?  I hope it's not the 
later and you have some advice for a remedy to my errors.

Thanks,

Tom



Sent from my T-Mobile 4G LTE Device

 Original message 
From: Carl Eugen Hoyos 
Date: 2/24/19 8:16 AM (GMT-08:00)
To: FFmpeg user questions 
Subject: Re: [FFmpeg-user] Timestamps are unset

2019-02-24 10:10 GMT+01:00, Tom Worton :

> ffmpeg.exe -i myvideofile.mkv -map 0 -vcodec copy -scodec copy
> -acodec ac3 -b:a 640k myvideofilewithAC3.mkv

Complete, uncut console output missing.

If you are just worried about a warning message:
You are not the intended recipient (and there is
nothing you can do about it).

Carl Eugen
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