[FFmpeg-user] Integration of ffmpeg

[The Admin]

Hi Jim,

  I ran it without redirecting the output and it worked.  I prefer writing
all the output to a log file, but if it works, that is more important in
this case.

Marc.

On Mon, Aug 16, 2021 at 10:21 PM The Admin <admin at globotrac.com> wrote:

> Hi Jim,
>
>   Thanks for suggesting the -nostdin option.  Unfortunately, it didn't
> work.
>
> I am redirecting the output of the subprocess to a file on Windows log
> file.
>
> *Log file highlights*
>
> Parameters written to a file named *filter.txt *from a batch file
> echo
> [0]adelay=0:all=1[0a];[1]adelay=17650:all=1[1a];[2]adelay=37510:all=1[2a];[0a][1a][2a]amix=inputs=3
> > "filter.txt"
>
> Referring to a parameter *-filter_complex_script filter.txt*
> C:\progra~1\GloboTRAC\ffmpeg\bin\ffmpeg.exe -nostdin -loglevel verbose -i
> a0.m3u8 -i a1.m3u8 -i a2.m3u8 -filter_complex_script filter.txt -y
> all_audio.mp4
>
> <Hangs after the previous line>
>
> NOTE:
> I removed the -map "[a]" and the [a] reference in the file because I
> thought perhaps the double quotes were creating an issue.
>
> Marc.
>
> On Mon, Aug 16, 2021 at 9:17 PM Jim DeLaHunt <list+ffmpeg-user at jdlh.com>
> wrote:
>
>> On 2021-08-16 17:38, The Admin wrote:
>>
>> > Hi,
>> >
>> >    Here the command that works fine at the command prompt.
>> > C:\progra~1\GloboTRAC\ffmpeg\bin\ffmpeg.exe -i a0.m3u8 -i a1.m3u8 -i
>> > a2.m3u8 -filter_complex
>> >
>> "[0]adelay=0:all=1[0a];[1]adelay=17650:all=1[1a];[2]adelay=37510:all=1[2a];[0a][1a][2a]amix=inputs=3[a]"
>> > -map "[a]"  -y all_audio.mp4
>> >
>> > When I run the same command from the Process.Start command in C#, it
>> just
>> > hangs.  I've even tried triggering the execution from .bat file and it
>> > hangs as well.
>> >
>> > If it is the subprocess, I am open to any suggestions.
>> >
>> > Any help would be appreciated.
>> >
>> > Marc.
>>
>> It may be that FFmpeg is trying to interact with stdin, and the
>> subprocess is not responding like a live shell would. Try adding the
>> `-nostdin` option to your command line. See answer
>> <https://stackoverflow.com/a/47114881/1099571> to question, "ffmpeg
>> hangs when run in background".
>>
>> If that answer helps you, consider upvoting it.
>>
>> Best regards,
>>       —Jim DeLaHunt
>>
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>