[gstreamer-bugs] [Bug 313970] ffdec_mpeg4 detects wrong framerate with some files

[GStreamer (bugzilla.gnome.org)]

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 http://bugzilla.gnome.org/show_bug.cgi?id=313970
 GStreamer | gst-ffmpeg | Ver: 0.8.6

Luca Ognibene changed:

           What    |Removed                     |Added
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                 CC|                            |luogni at tin.it



------- Additional Comments From Luca Ognibene  2005-09-17 12:26 -------
Well, i've looked at the problem.
ffmpeg reports the video as having 30000fps (i've also tried with current cvs).
In ffmpeg.c:3097 there is this check:

 if (enc->time_base.den != rfps || enc->time_base.num != rfps_base) { 
    fprintf(stderr,"\nSeems that stream %d comes from film source:
    ...
 }
 
where enc->time_base is the "framerate" information found by the decoder and
rfps the information found by the demuxer.
Then:

 /* update the current frame rate to match the stream frame rate */
            frame_rate      = rfps;
            frame_rate_base = rfps_base;
so ffmpeg always use the framerate information found by the demuxer.

If you try:
gst-launch-0.8 filesrc location="ffmpeg3000fps.avi" ! avidemux ! fakesink -v
you can see that the framerate is found correctly(framerate=(double)29.9699999).

So... what can we do? ffdec should set the framerate property only when there
isn't one already? Ronald, any idea?

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