[FFmpeg-user] ffmpeg hang in background

[Paul B Mahol]

On 10/10/18, sailor-godkane <jimmy at dcode.eu> wrote:
> Hello,
>
> I am using ffmpeg in a big project for video/audio automated processing.
> Each project for processing requires lots of ffmpeg commands. Those commands
> are run by a daemon written in ObjC using GnuStep.
> Since it runs on the background i used -nostdin and -loglevel quiet for
> production use.
> To be sure i read everything on stdout and stderr to /dev/null but it should
> not matter since the command does not output anything.
> Everything run fine except sometimes a ffmpeg command will hang and i cannot
> understand why.
> Sometimes i can see a few % of cpu used by the commands but after hours it
> was still there.
> When it happens i have to shutdown my daemon and restart the processing. The
> same command will then run fine and the process can be finished.
>
> Details of ffmpeg (compiled from source)
>
> ffmpeg version n4.0.2 Copyright (c) 2000-2018 the FFmpeg developers
>   built with gcc 4.8 (SUSE Linux)
>   configuration: --disable-programs --enable-ffprobe --enable-ffmpeg
> --enable-libx264 --enable-gpl --enable-shared --enable-pthreads
> --enable-libmp3lame --enable-pic
>   libavutil      56. 14.100 / 56. 14.100
>   libavcodec     58. 18.100 / 58. 18.100
>   libavformat    58. 12.100 / 58. 12.100
>   libavdevice    58.  3.100 / 58.  3.100
>   libavfilter     7. 16.100 /  7. 16.100
>   libswscale      5.  1.100 /  5.  1.100
>   libswresample   3.  1.100 /  3.  1.100
>   libpostproc    55.  1.100 / 55.  1.100
>
> System is :
>
> openSUSE 13.1 - 3.11.10-29-desktop
>
> The machine is a virtual one running on VMWare.
>
> The command that most often hangs is
>
> ffmpeg -nostdin -loglevel quiet -y -i front_slide_video.mov -an -r 16.000000
> -c:v libx264 -preset slow -b:v 5000k -aspect 1.333333 -vf
> scale=640:480,pad=640:480:0:0:black front_slide_video-rescaled.mov

What if you do not use -r parameter but fps filter explicitly in filtergraph?

>
> But i had other commands hanging randomly as well so this is just a sample.
>
> Since this is completely random i have no way of testing it. The command
> that hang works fine if i run it manually and it runs fine most of the time
> when the daemon runs it.
> I upgraded from a version 2.X that was running on the previous major version
> of my software. It's been a few years since i worked on it but i don't
> recall hangs back in the day with version 2.
>
> I had the same problem with 4.0.1 btw.
>
> Thanks for your help
>
>
>
>
> --
> Sent from: http://www.ffmpeg-archive.org/
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