[FFmpeg-trac] #6023(avcodec:new): support Transfer characteristic in DPX encoder

FFmpeg trac at avcodec.org
Wed Dec 14 17:04:26 EET 2016


#6023: support Transfer characteristic in DPX encoder
--------------------------------------+---------------------------------
               Reporter:  dericed     |                  Owner:
                   Type:  defect      |                 Status:  new
               Priority:  normal      |              Component:  avcodec
                Version:  git-master  |               Keywords:  dpx
             Blocked By:              |               Blocking:
Reproduced by developer:  0           |  Analyzed by developer:  0
--------------------------------------+---------------------------------
 Currently the DPX encoder only hardcodes a value when writing transfer
 characteristics. In the encoder a '2' is written [1] in this value which
 according to the DPX spec [2] means 'linear'.

 In this command I'm trying to create a bt709 DPX but the output is simply
 'linear'.

 {{{
 ffmpeg -f lavfi -i testsrc -color_trc bt709 -vframes 1 test.dpx
 ffmpeg version N-44102-g457e933 Copyright (c) 2000-2016 the FFmpeg
 developers
   built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
   configuration: --prefix=/usr/local/Cellar/ffmpeg/HEAD-457e933 --enable-
 shared --enable-pthreads --enable-gpl --enable-version3 --enable-
 hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-
 ldflags= --enable-chromaprint --enable-ffplay --enable-libfreetype
 --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl
 --disable-lzma --enable-vda
   libavutil      55. 43.100 / 55. 43.100
   libavcodec     57. 68.100 / 57. 68.100
   libavformat    57. 60.100 / 57. 60.100
   libavdevice    57.  2.100 / 57.  2.100
   libavfilter     6. 68.100 /  6. 68.100
   libavresample   3.  2.  0 /  3.  2.  0
   libswscale      4.  3.101 /  4.  3.101
   libswresample   2.  4.100 /  2.  4.100
   libpostproc    54.  2.100 / 54.  2.100
 Input #0, lavfi, from 'testsrc':
   Duration: N/A, start: 0.000000, bitrate: N/A
     Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 320x240
 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
 Output #0, image2, to 'test.dpx':
   Metadata:
     encoder         : Lavf57.60.100
     Stream #0:0: Video: dpx, rgb24(unknown/unknown/bt709), 320x240 [SAR
 1:1 DAR 4:3], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
     Metadata:
       encoder         : Lavc57.68.100 dpx
 Stream mapping:
   Stream #0:0 -> #0:0 (rawvideo (native) -> dpx (native))
 Press [q] to stop, [?] for help
 frame=    1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A
 speed=21.8x
 video:227kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: unknown
 }}}

 [1]
 https://github.com/FFmpeg/FFmpeg/blob/e06ef9aa5fe8a423ab58997f0c99112bb415b947/libavcodec/dpxenc.c#L221
 [2]
 https://web.archive.org/web/20050706060025/http://www.smpte.org/smpte_store/standards/pdf/s268m.pdf.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/6023>
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