[FFmpeg-user] ffmpeg hang in background

[De Pauw Jimmy]

I am back with this because it has not been resolved.
I removed -r and used -vf for framerate modification but the same 
command hanged again completely at random.

What has happened now in one project with 5 run without changing 
anything between each run :
- Run 1 : ffmpeg exited with code 11
- Run 2 : hang
- Run 3 : ffmpeg exited with code 11
- Run 4 : ffmpeg exited with code 11
- Run 5 : ran well

Does the code 11 mean a segmentation fault?
If it is, can i get more information about that segfault when running in 
the background?
It's impossible to reproduce the error just by running the command 
manually since it always works that way.

On 10/10/18 16:18, DopeLabs wrote:
> 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:
>>> 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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>>>
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>>> ffmpeg-user-request at ffmpeg.org with subject "unsubscribe".
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>>
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-- 
Evo 	
Jimmy De Pauw
SENIOR BACK-END DEVELOPER & DATA ANALYST
W www.evo.group <http://www.evo.group>
T +32 (0)2 649 13 00 <tel:+32-2-649-1300>