[FFmpeg-trac] #1426(undetermined:new): Colour space auto-selection does not work well for rgb48 input and yuv output

FFmpeg trac at avcodec.org
Thu Jun 7 15:13:21 CEST 2012


#1426: Colour space auto-selection does not work well for rgb48 input and yuv
output
-------------------------------------+-------------------------------------
               Reporter:  cehoyos    |                  Owner:
                   Type:  defect     |                 Status:  new
               Priority:  normal     |              Component:
                Version:  git-       |  undetermined
  master                             |               Keywords:
             Blocked By:             |               Blocking:
Reproduced by developer:  1          |  Analyzed by developer:  0
-------------------------------------+-------------------------------------
 Related to:
 http://thread.gmane.org/gmane.comp.video.ffmpeg.user/37525

 When encoding rgb48 with an encoder (like ffv1) that supports yuv at 16bit
 but not rgb at 16bit, yuv420p16 is auto-selected instead of yuv444p16.
 {{{
 $ ffmpeg -i tests/lena.pnm -pix_fmt rgb48 out.png
 ...
 $ ffmpeg -i out.png -vcodec ffv1 -coder 1 out.avi
 ffmpeg version N-41334-g647e2e0 Copyright (c) 2000-2012 the FFmpeg
 developers
   built on Jun  7 2012 09:18:33 with gcc 4.3.2
   configuration: --cc=/usr/local/gcc-4.3.2/bin/gcc --enable-gpl --enable-
 libopenjpeg --enable-libvorbis --enable-libspeex --enable-libmp3lame
 --enable-libtheora --extra-ldflags=-lm --enable-libvpx --enable-libxavs
   libavutil      51. 56.100 / 51. 56.100
   libavcodec     54. 24.100 / 54. 24.100
   libavformat    54.  6.101 / 54.  6.101
   libavdevice    54.  0.100 / 54.  0.100
   libavfilter     2. 78.100 /  2. 78.100
   libswscale      2.  1.100 /  2.  1.100
   libswresample   0. 15.100 /  0. 15.100
   libpostproc    52.  0.100 / 52.  0.100
 Input #0, image2, from 'out.png':
   Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
     Stream #0:0: Video: png, rgb48be, 256x256, 25 tbr, 25 tbn, 25 tbc
 [buffer @ 0x9012040] w:256 h:256 pixfmt:rgb48be tb:1/25 sar:0/1
 sws_param:flags=2
 [ffmpeg_buffersink @ 0x9011fa0] No opaque field provided
 [format @ 0x9012500] auto-inserting filter 'auto-inserted scaler 0'
 between the filter 'Parsed_null_0' and the filter 'format'
 [auto-inserted scaler 0 @ 0x9012420] w:256 h:256 fmt:rgb48be sar:0/1 ->
 w:256 h:256 fmt:yuv420p16le sar:0/1 flags:0x4
 stream->bits_per_coded_sample: 0, stream->extradata_size: 0
 Output #0, avi, to 'out.avi':
   Metadata:
     ISFT            : Lavf54.6.101
     Stream #0:0: Video: ffv1 (FFV1 / 0x31564646), yuv420p16le, 256x256,
 q=2-31, 200 kb/s, 25 tbn, 25 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (png -> ffv1)
 Press [q] to stop, [?] for help
 frame=    1 fps=0.0 q=0.0 Lsize=     140kB time=00:00:00.04
 bitrate=28654.4kbits/s
 video:134kB audio:0kB global headers:0kB muxing overhead 4.147827%
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1426>
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