[FFmpeg-trac] #1122(avcodec:open): H264 interlaced multithreaded decoding artifacts

[FFmpeg]

#1122: H264 interlaced multithreaded decoding artifacts
-------------------------------------+-------------------------------------
             Reporter:  efenstor     |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  important    |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  h264         |               Blocked By:
  regression                         |  Reproduced by developer:  1
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by cehoyos):

 * keywords:   => h264 regression
 * status:  new => open
 * component:  FFmpeg => avcodec
 * reproduced:  0 => 1


Comment:

 I was able to reproduce this with -threads 7:

 {{{
 $ ffmpeg -threads 7 -i 00009.MTS -f framecrc out7
 ffmpeg version N-39129-gf6b7863 Copyright (c) 2000-2012 the FFmpeg
 developers
   built on Mar 22 2012 19:37:33 with gcc 4.3.2
   configuration: --cc=/usr/local/gcc-4.3.2/bin/gcc --enable-gpl
   libavutil      51. 44.100 / 51. 44.100
   libavcodec     54. 12.100 / 54. 12.100
   libavformat    54.  2.100 / 54.  2.100
   libavdevice    53.  4.100 / 53.  4.100
   libavfilter     2. 65.102 /  2. 65.102
   libswscale      2.  1.100 /  2.  1.100
   libswresample   0.  7.100 /  0.  7.100
   libpostproc    52.  0.100 / 52.  0.100
 [h264 @ 0x8ed87e0] Increasing reorder buffer to 1
 [mpegts @ 0x8ed4b60] max_analyze_duration 5000000 reached at 5003333
 Input #0, mpegts, from '00009.MTS':
   Duration: 00:00:36.54, start: 0.766967, bitrate: 6884 kb/s
   Program 1
     Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448), yuv420p,
 1440x1080 [SAR 4:3 DAR 16:9], 59.96 fps, 59.94 tbr, 90k tbn, 59.94 tbc
     Stream #0:1[0x1100]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo,
 s16, 256 kb/s
 [buffer @ 0x8ed4ac0] w:1440 h:1080 pixfmt:yuv420p tb:1/1000000 sar:4/3
 sws_param:
 Output #0, framecrc, to 'out7':
   Metadata:
     encoder         : Lavf54.2.100
     Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 1440x1080
 [SAR 4:3 DAR 16:9], q=2-31, 200 kb/s, 59.94 tbn, 59.94 tbc
     Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
 Stream mapping:
   Stream #0:0 -> #0:0 (h264 -> rawvideo)
   Stream #0:1 -> #0:1 (ac3 -> pcm_s16le)
 Press [q] to stop, [?] for help
 frame= 1095 fps= 21 q=0.0 Lsize=     127kB time=00:00:36.55 bitrate=
 28.4kbits/s
 video:2494547kB audio:6852kB global headers:0kB muxing overhead
 -99.994933%
 }}}
 After several tries, the output was different from "-threads 1".

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1122#comment:1>
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