[FFmpeg-trac] #3397(avcodec:new): gray decoding regression

FFmpeg trac at avcodec.org
Tue Feb 18 16:59:53 CET 2014


#3397: gray decoding regression
-------------------------------------+-------------------------------------
               Reporter:  cehoyos    |                  Owner:
                   Type:  defect     |                 Status:  new
               Priority:  important  |              Component:  avcodec
                Version:  git-       |               Keywords:  h264
  master                             |  regression
             Blocked By:             |               Blocking:
Reproduced by developer:  0          |  Analyzed by developer:  0
-------------------------------------+-------------------------------------
 http://thread.gmane.org/gmane.comp.video.ffmpeg.user/50518/focus=50526
 H264 decoding with {{{-flags +gray}}} is broken for for P-frames and
 B-frames, regression since bb29ee62 / d2a25c40
 out.avi is green except for input I-frames:
 {{{
 $ ffmpeg -flags +gray -i fate-suite/h264/extreme-plane-pred.h264 -qscale 2
 out.avi
 ffmpeg version N-60713-g1355caf Copyright (c) 2000-2014 the FFmpeg
 developers
   built on Feb 18 2014 16:50:43 with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl --enable-gray
   libavutil      52. 64.100 / 52. 64.100
   libavcodec     55. 52.102 / 55. 52.102
   libavformat    55. 33.100 / 55. 33.100
   libavdevice    55. 10.100 / 55. 10.100
   libavfilter     4.  1.102 /  4.  1.102
   libswscale      2.  5.101 /  2.  5.101
   libswresample   0. 17.104 /  0. 17.104
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, h264, from 'fate-suite/h264/extreme-plane-pred.h264':
   Duration: N/A, bitrate: N/A
     Stream #0:0: Video: h264 (High), yuv420p, 352x288, 25 fps, 25 tbr,
 1200k tbn, 50 tbc
 Please use -q:a or -q:v, -qscale is ambiguous
 Output #0, avi, to 'out.avi':
   Metadata:
     ISFT            : Lavf55.33.100
     Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 352x288,
 q=2-31, 200 kb/s, 25 tbn, 25 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (h264 -> mpeg4)
 Press [q] to stop, [?] for help
 frame=  100 fps=0.0 q=2.0 Lsize=    3532kB time=00:00:04.00
 bitrate=7232.8kbits/s
 video:3524kB audio:0kB subtitle:0 data:0 global headers:0kB muxing
 overhead 0.225428%
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/3397>
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