[FFmpeg-trac] #502(undetermined:reopened): Jumping frames when copying video of an h264 file

FFmpeg trac at avcodec.org
Sun Oct 9 15:33:38 CEST 2011


#502: Jumping frames when copying video of an h264 file
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             Reporter:  Alex__       |                    Owner:
                 Type:  defect       |                   Status:  reopened
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:               |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by Alex__):

 Thank you for the feedback.

 > It certainly does mean that most developers will not be able to
 reproduce it.

 I can start an old VM to test it using Windows with QuickTime.

 > So you'll have to explain what "jumping" exactly means.

 Therefore I added the above linked screencast.

 > if however it means the frames play out of order

 I guess this is the case.

 > that is most likely a bug in the QuickTime H.264 decoder

 Hard to say which fault it is: wrong encoding with a resilient decoder
 (VLC) or correct encoding with a bug in the decoder (QuickTime).

 > In that case you should be able to also see the issue when playing the
 AVI file (I think there are plugins that should allow playing it directly
 in QuickTime).

 The AVI file plays fine.

 > I'd like to ask developers to avoid changing bug state without writing a
 few words though.

 If you need any other feedback, please let me know.

-- 
Ticket URL: <https://avcodec.org/trac/ffmpeg/ticket/502#comment:7>
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