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FFMPEG - zero file size when sound enabled

Answer 1

+4 A:

What sort of access do you have to the server - you must have some ability to run commands on it.

That being the case, what is the error output from ffmpeg?

Possibly an appropriate verbose argument would tell you more about the problem?

EDIT:

Let's see if we can get stderr output. Run:

ffmpeg -version

And see if you can get some output for it. Once you've managed to extract some stderr output then we can investigate the original issue.

EDIT:

So it looks like you're loosing stderr - now you need to work out how to retrieve it.

Maybe:

ffmpeg -version 2>&1

will work?

EDIT:

How we're getting somewhere - the input audio codec isn't supported:

Unsupported codec (id=73728) for input stream #0.1

I don't know what Stream #0.1(jpn): Audio: samr / 0x726D6173, 8000 Hz, mono is.

But there's you're problem.

I suggest that you might want to investigate on a local Linux box - it might be easier to see problems.

EDIT:

From http://www.nabble.com/Convert-3gp-samr-file-td20514476.html it looks like ffmpeg can be compiled with support --enable-libamr-nb --enable-libamr-wb.

Is recompiling ffmpeg an option?

Douglas Leeder 2009-03-06 14:46:12

Probably not a file access problem if he's able to convert the file without audio. That being said, +1 for the verbose output to help diagnosis.

lpfavreau 2009-03-06 14:48:34

I'm using PHP's system function (http://php.net/system), which is returning 0. I've tried passthru, too, which doesn't output anything.

John McCollum 2009-03-06 14:53:37

When I go for the ultra-simple ffmpeg -i $infile test.flv, it returns 1, if that helps.

John McCollum 2009-03-06 14:58:53

Running -version doesn't output anything, but running -formats works, as does -L and -h!

John McCollum 2009-03-06 15:20:57

Those all output some stuff to stdout - I tried -h first, before I worked out the -version only outputs to stderr.

Douglas Leeder 2009-03-06 15:26:42

Aha, redirecting stderr to a file does the trick - thanks for all your help so far.

John McCollum 2009-03-06 15:45:41

Thank you - it seems that the issue is 3gp/MP4 format - which requires the libamr codecs! Thank you very much for your help - getting the stderr output was crucial in debugging this - I've learned something today!

John McCollum 2009-03-06 15:57:00

Cawas 2010-04-08 15:56:26

Answer 2

A:

I resolved this issue. Here my code:

<?php
   define('FFMPEG_LIBRARY', '/usr/local/bin/ffmpeg');
   $exec_string = FFMPEG_LIBRARY.' -i robot.avi -an output.flv';
   exec($exec_string); //where exec is the command used to execute shell command in php
?>

2009-07-23 06:00:53

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FFMPEG - zero file size when sound enabled

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