[FFmpeg-trac] #427(avcodec:new): Visible artefacts with packed B-frames

[FFmpeg]

#427: Visible artefacts with packed B-frames
-------------------------+---------------------
  Reporter:  cehoyos     |      Owner:
      Type:  defect      |     Status:  new
  Priority:  important   |  Component:  avcodec
   Version:  git-master  |   Keywords:
Blocked By:              |   Blocking:
Reproduced:  0           |   Analyzed:  0
-------------------------+---------------------
 Regression since a0cd98b5943a7807aff837f9adba1dd034ec2272, related to
 ticket #127
 (The initial artefacts are unrelated.)
 {{{
 $ ffmpeg -i OUTPUT2.avi -an -qscale 2 out.avi
 ffmpeg version N-32290-g6fc1299, Copyright (c) 2000-2011 the FFmpeg
 developers
   built on Sep  2 2011 13:02:00 with gcc 4.5.3
   configuration: --cc=/usr/local/gcc-4.5.3/bin/gcc
   libavutil    51. 14. 0 / 51. 14. 0
   libavcodec   53. 12. 0 / 53. 12. 0
   libavformat  53. 10. 0 / 53. 10. 0
   libavdevice  53.  3. 0 / 53.  3. 0
   libavfilter   2. 37. 0 /  2. 37. 0
   libswscale    2.  0. 0 /  2.  0. 0
 [avi @ 0x12a1420] Format avi probed with size=2048 and score=100
 [AVI demuxer @ 0x12a1a40] use odml:1
 [mpeg4 @ 0x12a3440] Invalid and inefficient vfw-avi packed B frames
 detected
 [avi @ 0x12a1420] All info found
 Input #0, avi, from 'OUTPUT2.avi':
   Metadata:
     encoder         : Lavf52.110.0
   Duration: 00:00:10.03, start: 0.000000, bitrate: 1702 kb/s
     Stream #0.0, 1, 100/2997: Video: mpeg4 (Advanced Simple Profile) (xvid
 / 0x64697678), yuv420p, 720x480 [SAR 32:27 DAR 16:9], 100/2997, 29.97 tbr,
 29.97 tbn, 29.97 tbc
     Stream #0.1, 17, 3/125: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz,
 stereo, s16, 128 kb/s
 [buffer @ 0x12a2680] w:720 h:480 pixfmt:yuv420p tb:1/1000000 sar:32/27
 sws_param:
 [mpeg4 @ 0x12a0e80] Unsupported bit depth: 0
 Output #0, avi, to 'out.avi':
   Metadata:
     ISFT            : Lavf53.10.0
     Stream #0.0, 0, 100/2997: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p,
 720x480 [SAR 32:27 DAR 16:9], 100/2997, q=2-31, 200 kb/s, 29.97 tbn, 29.97
 tbc
 Stream mapping:
   Stream #0.0 -> #0.0 (mpeg4 -> mpeg4)
 Press [q] to stop, [?] for help
 [mpeg4 @ 0x12a3440] Unsupported bit depth: 0
 [mpeg4 @ 0x12a3440] Invalid and inefficient vfw-avi packed B frames
 detected
 [mpeg4 @ 0x12a3440] Unsupported bit depth: 0
 [mpeg4 @ 0x12a3440] Discarding excessive bitstream in packed xvid
 frame=  188 fps=  0 q=2.0 Lsize=    2411kB time=00:00:10.04
 bitrate=1966.3kbits/s
 video:2398kB audio:0kB global headers:0kB muxing overhead 0.532623%
 }}}

-- 
Ticket URL: <https://avcodec.org/trac/ffmpeg/ticket/427>
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