[libav-bugs] [Bug 794] New: Distorted Video with DivX Version 5

bugzilla at aruru.libav.org bugzilla at aruru.libav.org
Sat Dec 20 15:19:08 CET 2014


https://bugzilla.libav.org/show_bug.cgi?id=794

            Bug ID: 794
           Summary: Distorted Video with DivX Version 5
           Product: Libav
           Version: 11
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: ---
         Component: libavcodec
          Assignee: bugzilla at libav.org
          Reporter: fabian+debian at greffrath.com

Created attachment 515
  --> https://bugzilla.libav.org/attachment.cgi?id=515&action=edit
screenshot of distorted video playback (gst-play)

Hi there,

I have a couple of videos in AVI format encoded with DivX Version 5. All these
videos play back heavily distorted with avplay, but play back fine with ffplay
or VLC (even though the latter is linked against libavcodec from libav). Please
see the attached screenshot for an example.

I have created a short video sample here:
http://greffrath.com/~fabian/test.avi

Please note that this sample plays back fine with VLC from the beginning to the
end, although it complains that the AVI file index is broken or missing.
Whatever that means, I chose to "play as is" and it works. The index is most
probably broken, because the sample is just a dd'ed snippet of a complete DVD
rip, but the video distortion accurs identically with the whole original file.

A strange fact worth noting is that the video quality can sometimes be
drastically improved (even back to "normal") by wildly seeking from one point
in time to the other in the video. For example, if you seek to the scene on the
cemetery and then back to the scene in the cab back and forth a couple times,
the video will be solid from the next i-frame on, e.g. when the man leaves the
cab.

Hope that helps, please don't hesitate to ask if yo uneed further information
or longer samples.

Cheers,

Fabian

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