[FFmpeg-user] Integration of ffmpeg

[Phil Rhodes]

 I had this problem running it under C# once. I can't remember what the solution was, but I seem to recall that it was something to do with the fact that ffmpeg writes most of its status information not to standard output, but to standard error, presumably so as to keep standard output free for the media data it's producing.
(If it has occurred to anyone that the 1970s punch-card model of data handling which provokes this situation is no longer entirely appropriate for modern computing, you're not alone.)
P
    On Tuesday, 17 August 2021, 03:34:54 BST, The Admin <admin at globotrac.com> wrote:  
 
 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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>>
>
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