[cgkit-user] using cgkit wrappers to ffmpeg

[Jonathan P. <jon...@no...>]

Hi there,

I'm one of the authors of a python app called PsychoPy for presenting 
stimuli in psychology/neuroscience experiments and I'm looking into the 
ctypes wrappers that you've built to ffmpeg as a part of cgkit. I Have 
an opengl-based rendering engine and for movie inputs I currently use 
avbin as a way to fetch the current frame which I then convert to a 
texture, but I've had a number of headaches with avbin and looking for 
alternatives.

Right now I'm testing on a mac, but this will ultimately be x-platform. 
And I'm currently restricted to using 32bit on all platforms for reasons 
of other dependencies.

So... I've built libavformat, libavcodec, ffmpeg etc. and these seem to 
be found/imported successfully by cgkit.ffmpeg but when I try to load my 
movie file I'm getting an erroneous error message about the file not 
being found:

 >>> from ffmpeg import findlib, avformat #I've dragged your ffmpeg to a 
separate loc
 >>> print os.path.isfile('jwpIntro.mov')
True
 >>> ff = avformat.av_open_input_file('jwpIntro.mov')
Traceback (most recent call last):
   File "/Users/jwp/Desktop/cgKit_ffmpeg.py", line 7, in <module>
     ff = avformat.av_open_input_file('jwpIntro.mov')
   File "/Users/jwp/code/ffmpeg/avformat.py", line 142, in 
av_open_input_file
     raise AVFormatError(ret)
ffmpeg.avformat.AVFormatError: No such file or directory

I'm a bit stumped about how to debug this further. Any idea what would 
cause the message?
cheers,
Jon

-- 
Jonathan Peirce
Nottingham Visual Neuroscience

http://www.peirce.org.uk

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