"Unable to obtain file audio codec with ffprobe" from PHP

[swvjeff]

youtube-dl works perfectly when I run from my shell. But when I try to run the exact same command via PHP's proc_open() I get the following error:

ERROR: WARNING: unable to obtain file audio codec with ffprobe
Traceback (most recent call last):
  File "/opt/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 731, in post_process
    keep_video_wish, new_info = pp.run(info)
  File "/opt/local/bin/youtube-dl/youtube_dl/PostProcessor.py", line 156, in run
    raise PostProcessingError(u'WARNING: unable to obtain file audio codec with ffprobe')
PostProcessingError

Here's the command I'm running:

youtube-dl 'http://www.youtube.com/watch?v=dQw4w9WgXcQ' -v -k --extract-audio --audio-format mp3 --audio-quality 0 -o 'writable_dir/%(id)s.%(ext)s'

And here's some system info:

$ system_profiler SPSoftwareDataType
System Version: OS X 10.9 (13A603)
$ php --version
PHP 5.4.4 (cli) (built: Jul  4 2012 17:28:56) 
$ httpd -version
Server version: Apache/2.2.24 (Unix)
$ youtube-dl --version
2013.11.06.1
$ ffmpeg -version
ffmpeg version 2.1
$ ffprobe -version
ffprobe version 2.1
$ which ffmpeg ffprobe youtube-dl
/opt/local/bin/ffmpeg
/opt/local/bin/ffprobe
/opt/local/bin/youtube-dl

At first I thought it was a PATH issue, so I made sure PATH was set properly, but I'm still getting the error. Here's a snippet of PHP (and its output) that I'm running prior to my proc_open() command:

putenv("PATH=".getenv("PATH").PATH_SEPARATOR."/opt/local/bin");
print exec('echo $PATH');
/usr/bin:/bin:/usr/sbin:/sbin:/opt/local/bin

So, is there anything I'm doing wrong here? Or is there any way to tell youtube-dl the paths of ffmpeg and ffprobe?

[swvjeff]

Pretty isolated case, but I finally found the issue. Hopefully this helps anyone who is running MAMP and installed ffmpeg via macports.

Apparently MAMP sets the DYLD_LIBRARY_PATH variable, which conflicts with the call to ffprobe when trying to determine the file's audio codec. To fix this, just comment out these two lines in
/Applications/MAMP/Library/bin/envvars and restart apache.

DYLD_LIBRARY_PATH="/Applications/MAMP/Library/lib:$DYLD_LIBRARY_PATH"
export DYLD_LIBRARY_PATH

Credit:
http://stackoverflow.com/questions/10107671/ffmpeg-mamp-dyld-library-not-loaded-error