[FFmpeg-trac] #6844(undetermined:new): u263: repeated frames in the output avi file (at the beginning of the video)

[FFmpeg]

#6844: u263: repeated frames in the output avi file (at the beginning of the
video)
-------------------------------------+-------------------------------------
               Reporter:  ami_stuff  |                  Owner:
                   Type:  defect     |                 Status:  new
               Priority:  normal     |              Component:
                Version:             |  undetermined
  unspecified                        |               Keywords:
             Blocked By:             |               Blocking:
Reproduced by developer:  0          |  Analyzed by developer:  0
-------------------------------------+-------------------------------------
 it looks like ffmpeg duplicates some frames at the beginning of the video
 in the output avi file
 (does not happen with mov or mkv muxer)


 https://trac.ffmpeg.org/raw-attachment/ticket/1536/u263_b-frames_5.avi


 {{{
 C:\>ffmpeg -i u263_b-frames_5.avi out.avi

 ffmpeg version 3.4.git Copyright (c) 2000-2017 the FFmpeg developers
   built with gcc 4.6.2 (GCC)
   configuration: --enable-gpl --disable-ffprobe
   libavutil      56.  0.100 / 56.  0.100
   libavcodec     58.  1.100 / 58.  1.100
   libavformat    58.  0.102 / 58.  0.102
   libavdevice    58.  0.100 / 58.  0.100
   libavfilter     7.  0.101 /  7.  0.101
   libswscale      5.  0.101 /  5.  0.101
   libswresample   3.  0.101 /  3.  0.101
   libpostproc    55.  0.100 / 55.  0.100
 [h263 @ 0236d320] Warning: not compiled with thread support, using thread
 emulat
 ion
 Input #0, avi, from 'u263_b-frames_5.avi':
   Duration: 00:00:12.64, start: 0.000000, bitrate: 403 kb/s
     Stream #0:0: Video: h263 (U263 / 0x33363255), yuv420p, 320x240 [SAR
 12:11 DA
 R 16:11], 401 kb/s, 23.97 fps, 23.97 tbr, 23.97 tbn, 29.97 tbc
 [h263 @ 024da020] Warning: not compiled with thread support, using thread
 emulat
 ion
 Stream mapping:
   Stream #0:0 -> #0:0 (h263 (native) -> mpeg4 (native))
 Press [q] to stop, [?] for help
 [mpeg4 @ 024db700] Warning: not compiled with thread support, using thread
 emula
 tion
 Output #0, avi, to 'out.avi':
   Metadata:
     ISFT            : Lavf58.0.102
     Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 320x240 [SAR
 12:11 D
 AR 16:11], q=2-31, 200 kb/s, 23.97 fps, 23.97 tbn, 23.97 tbc
     Metadata:
       encoder         : Lavc58.1.100 mpeg4
     Side data:
       cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
 [h263 @ 024da020] video_delay is larger in decoder than demuxer 1 > 0.
 If you want to help, upload a sample of this file to
 ftp://upload.ffmpeg.org/inc
 oming/ and contact the ffmpeg-devel mailing list. (ffmpeg-
 devel at ffmpeg.org)
     Last message repeated 513 times
 frame=  259 fps=0.0 q=4.6 size=     262kB time=00:00:11.01 bitrate=
 194.6kbits/s
 [h263 @ 024da020] video_delay is larger in decoder than demuxer 1 > 0.
 If you want to help, upload a sample of this file to
 ftp://upload.ffmpeg.org/inc
 oming/ and contact the ffmpeg-devel mailing list. (ffmpeg-
 devel at ffmpeg.org)
     Last message repeated 79 times
 frame=  298 fps=0.0 q=6.4 Lsize=     413kB time=00:00:12.64 bitrate=
 267.9kbits/
 s dup=0 drop=1 speed=22.5x
 video:400kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing o
 verhead: 3.216068%
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/6844>
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