[FFmpeg-trac] #28(avcodec:new): Encoding mpeg-4 with threads and b-frames outputs errors on decoding

[FFmpeg]

#28: Encoding mpeg-4 with threads and b-frames outputs errors on decoding
----------------------+---------------------
  Reporter:  cehoyos  |      Owner:  michael
      Type:  defect   |     Status:  new
  Priority:  normal   |  Component:  avcodec
   Version:  git      |   Keywords:
Blocked By:           |   Blocking:
Reproduced:  0        |   Analyzed:  0
----------------------+---------------------
 With this sample, at least four threads are necessary to trigger an error
 on decoding, three is enough for other samples (that trigger different
 errors on decoding).
 {{{
 $ ./ffmpeg -i fate-suite/svq3/Vertical400kbit.sorenson3.mov -threads 4 -bf
 1 -an -qscale 5 out.avi
 FFmpeg version git-N-28683-g2007c1b, Copyright (c) 2000-2011 the FFmpeg
 developers
   built on Mar 28 2011 23:49:16 with gcc 4.5.2
   configuration: --cc=/usr/local/gcc-4.5.2/bin/gcc --enable-gpl
   libavutil    50. 40. 0 / 50. 40. 0
   libavcodec   52.116. 0 / 52.116. 0
   libavformat  52.103. 0 / 52.103. 0
   libavdevice  52.  3. 0 / 52.  3. 0
   libavfilter   1. 76. 0 /  1. 76. 0
   libswscale    0. 13. 0 /  0. 13. 0
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x11f6650] max_analyze_duration reached

 Seems stream 0 codec frame rate differs from container frame rate: 600.00
 (600/1) -> 30.00 (30/1)
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'fate-
 suite/svq3/Vertical400kbit.sorenson3.mov':
   Metadata:
     creation_time   : 2001-03-20 16:17:18
     title           : Vertical Online SV3 Demo
     title-eng       : Vertical Online SV3 Demo
     artist          : Logan Kelsey
     artist-eng      : Logan Kelsey
     copyright       : © Vertical Online 2001
     copyright-eng   : © Vertical Online 2001
     encoder         : Sorenson Video 3
     encoder-eng     : Sorenson Video 3
   Duration: 00:00:43.57, start: 0.000000, bitrate: 580 kb/s
     Stream #0.0(eng): Video: svq3, yuvj420p, 320x240, 391 kb/s, 30.02 fps,
 30 tbr, 600 tbn, 600 tbc
     Metadata:
       creation_time   : 2001-03-20 16:17:18
     Stream #0.1(eng): Audio: adpcm_ima_qt, 44100 Hz, 1 channels, s16
     Metadata:
       creation_time   : 2001-03-20 16:17:18
 Incompatible pixel format 'yuvj420p' for codec 'mpeg4', auto-selecting
 format 'yuv420p'
 [buffer @ 0x11ff120] w:320 h:240 pixfmt:yuvj420p
 [ffsink @ 0x11f7780] auto-inserting filter 'auto-inserted scaler 0'
 between the filter 'src' and the filter 'out'
 [scale @ 0x11f7a90] w:320 h:240 fmt:yuvj420p -> w:320 h:240 fmt:yuv420p
 flags:0xa0000004
 Output #0, avi, to 'out.avi':
   Metadata:
     creation_time   : 2001-03-20 16:17:18
     INAM            : Vertical Online SV3 Demo
     title-eng       : Vertical Online SV3 Demo
     IART            : Logan Kelsey
     artist-eng      : Logan Kelsey
     ICOP            : © Vertical Online 2001
     copyright-eng   : © Vertical Online 2001
     encoder-eng     : Sorenson Video 3
     ISFT            : Lavf52.103.0
     Stream #0.0(eng): Video: mpeg4, yuv420p, 320x240, q=2-31, 200 kb/s, 30
 tbn, 30 tbc
     Metadata:
       creation_time   : 2001-03-20 16:17:18
 Stream mapping:
   Stream #0.0 -> #0.0
 Press ctrl-c to stop encoding
 frame= 1308 fps=439 q=5.0 Lsize=    1977kB time=43.57 bitrate=
 371.7kbits/s
 video:1940kB audio:0kB global headers:0kB muxing overhead 1.904159%
 $ ./ffmpeg -i out.avi -f null -
 FFmpeg version git-N-28683-g2007c1b, Copyright (c) 2000-2011 the FFmpeg
 developers
   built on Mar 28 2011 23:49:16 with gcc 4.5.2
   configuration: --cc=/usr/local/gcc-4.5.2/bin/gcc --enable-gpl
   libavutil    50. 40. 0 / 50. 40. 0
   libavcodec   52.116. 0 / 52.116. 0
   libavformat  52.103. 0 / 52.103. 0
   libavdevice  52.  3. 0 / 52.  3. 0
   libavfilter   1. 76. 0 /  1. 76. 0
   libswscale    0. 13. 0 /  0. 13. 0
 Input #0, avi, from 'out.avi':
   Metadata:
     artist          : Logan Kelsey
     copyright       : © Vertical Online 2001
     title           : Vertical Online SV3 Demo
     encoder         : Lavf52.103.0
   Duration: 00:00:43.60, start: 0.000000, bitrate: 371 kb/s
     Stream #0.0: Video: mpeg4, yuv420p, 320x240 [PAR 1:1 DAR 4:3], 30 tbr,
 30 tbn, 30 tbc
 [buffer @ 0x11f9ab0] w:320 h:240 pixfmt:yuv420p
 [setdar @ 0x1210240] a:4/3
 [setdar @ 0x1210240] w:320 h:240 -> dar:4/3 sar:1/1
 Output #0, null, to 'pipe:':
   Metadata:
     artist          : Logan Kelsey
     copyright       : © Vertical Online 2001
     title           : Vertical Online SV3 Demo
     encoder         : Lavf52.103.0
     Stream #0.0: Video: rawvideo, yuv420p, 320x240 [PAR 1:1 DAR 4:3],
 q=2-31, 200 kb/s, 90k tbn, 30 tbc
 Stream mapping:
   Stream #0.0 -> #0.0
 Press ctrl-c to stop encoding
 [mpeg4 @ 0x11f9010] illegal MB_type
 [mpeg4 @ 0x11f9010] Error at MB: 262
 [mpeg4 @ 0x11f9010] concealing 0 DC, 0 AC, 0 MV errors
 frame= 1308 fps=  0 q=0.0 Lsize=      -0kB time=43.60 bitrate=
 -0.0kbits/s
 video:0kB audio:0kB global headers:0kB muxing overhead -inf%
 }}}

-- 
Ticket URL: <http://avcodec.org/trac/ffmpeg/ticket/28>
FFmpeg <http://ffmpeg.org>
FFmpeg issue tracker