[FFmpeg-trac] #479(undetermined:new): AVStream.start_time incorrect for Sony XDCAM-EX files

FFmpeg trac at avcodec.org
Thu Sep 22 19:56:28 CEST 2011

#479: AVStream.start_time incorrect for Sony XDCAM-EX files
             Reporter:  rmk          |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:               |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0

Comment (by rmk):

 The initial GOP header has closed_gop=1 and broken_link=0 (spec section
 6.3.8, debug output: GOP ( 0:00:00.[00]) closed_gop=1 broken_link=0).
 Together with the fact that the initial B-frames decode fine, I tend to
 believe that the stream is valid and ffmpeg treats the case incorrectly
 assuming I do not misunderstand the semantics of AVStream.start_time. If
 that is correct the warning
 [mpeg2video @ 0x10106f400] warning: first frame is no keyframe
 probably should not be triggered in this case either.

Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/479#comment:5>
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