[FFmpeg-trac] #384(undetermined:open): Incorrect number of frames reported with .3gp file

[FFmpeg]

#384: Incorrect number of frames reported with .3gp file
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Reporter:  hackish      |       Owner:
    Type:  defect       |      Status:  open
Priority:  normal       |   Component:  undetermined
 Version:  unspecified  |  Resolution:
Keywords:  frame count  |  Blocked By:
Blocking:               |  Reproduced:  0
Analyzed:  0            |
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Changes (by cehoyos):

 * status:  new => open


Comment:

 ffmpeg also reports 684 frames (either use -vsync 0 or subtract the
 duplicated frames - 129 - from the number of output frames).

 Could you explain what your problem is? I don't think ffmpeg is designed
 to count frames (although it does work fine for the file you uploaded),
 maybe it works with ffprobe, I haven't used it much.

 For this sample, the frame duplication does not happen for every container
 (avi), for your other sample, fps is probably misdetected.

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Ticket URL: <https://avcodec.org/trac/ffmpeg/ticket/384#comment:2>
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