number of frames less than expected

[Paul]

Thank you very much for releasing this code.

I am trying to convert an mp4 xvid movie created with mencoder
lavcodec to a 3D hdf5 array (t, rows, cols) using h5py.

For two separate movies, the number of frames I get by stepping
through the movie using tracks[0].get_next_frame() is shorter than the
number of frames in the original movie. I am not sure what I am doing
wrong.

I also tried converting the movie to raw encoding but pyffmpeg
complained that it could not find the corresponding codec.

Thanks,
Paul.

[Martin Haller]

Hello Paul,

you are using 2.1 beta? Try to use check_start option for
mp.open(filename, options) with
options = { 'video1':(CODEC_TYPE_VIDEO, -1, {'check_start':0})}

check_start reads already some packets and the subsequently seek
operation does not properly seek back. That is currently an open issue
for version 2.1 alpha

Best regards,
Martin

[Paul]

Martin,

I will try 2.1 beta, though I remember I had difficulty building on
latest Ubuntu. I am using 2.0.

Thanks for the tip about the first few packets.

Is it possible to specify a frame rate for the movie stream? When
using command line ffmpeg, I always have issues with these particular
movies and have to explicitly specify the frame rate. Is it possible
to do the same with pyffmpeg?

Thanks,
Paul

[Paul]

Btw,

I wasn't able to use 2.1beta as I get the error:

/home/paul/local/lib/python/pyffmpeg.so: undefined symbol:
avcodec_decode_audio3

I wasn't able to find any info on this function in the ffmpeg docs and
the function doesn't exist in my ffmpeg libs (0.6.1).

Paul

[Martin Haller]

Hi Paul,

Current release for FFmpeg is 0.6.9 (http://ffmpeg.org/download.html). Maybe, you should check this version. However, I use the repository version. But, I think for the ease of use further releases should link against official releases.

Best regards,
Martin

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Hallo,

Viele Grüße,
Martin