[FFmpeg-user] ffmpeg hang in background
dopelabs at dubstep.fm
Wed Oct 10 17:18:39 EEST 2018
its not very well documented but ffmpeg has a daemon mode
ffmpeg -d <all your stuff> </dev/null &
> On Oct 10, 2018, at 6:56 46AM, Paul B Mahol <onemda at gmail.com> wrote:
> On 10/10/18, sailor-godkane <jimmy at dcode.eu> wrote:
>> 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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