[FFmpeg-trac] #3817(ffmpeg:new): h.264: decoding gives duplicated frame

[FFmpeg]

#3817: h.264: decoding gives duplicated frame
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             Reporter:  MkMs    |                     Type:  defect
               Status:  new     |                 Priority:  normal
            Component:  ffmpeg  |                  Version:  unspecified
             Keywords:  h.264   |               Blocked By:
             Blocking:          |  Reproduced by developer:  0
Analyzed by developer:  0       |
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 '''Summary of the bug:'''

 Using the quantization to get a video version of lower quality (video
 format is mp4, used h.264 - ).
 Bug: Changing frame count - Original video has x frames, the lower quality
 video has x+1 frames
 First and second frame are identical.

 How to reproduce:
 {{{
 ffmpeg.exe -i baumgartner.mp4 -c:v libx264 -q:v 32 -pix_fmt yuv420p
 baumgartner_qp32.mp4

 extract png frames out of qp_video to check frame count:
 ffmpeg.exe -i baumgartner.mp4 -f image2 -pix_fmt yuv420p
 baumgartner_%%04d.png
 ffmpeg.exe -i baumgartner_qp32.mp4 -f image2 -pix_fmt yuv420p
 baumgartner_%%04d.png
 }}}

 ffmpeg version N-65107-ga507623 Copyright (c) 2000-2014 the FFmpeg
 developers built on Jul 29 2014 22:06:30 with gcc 4.8.3 (GCC)

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Ticket URL: <https://trac.ffmpeg.org/ticket/3817>
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