#10839: incorrect YCoCg to RGB conversion in swscale
---------------------------------------+-----------------------------------
             Reporter:  Connor Worley  |                    Owner:  (none)
                 Type:  defect         |                   Status:  closed
             Priority:  wish           |                Component:  swscale
              Version:  unspecified    |               Resolution:  wontfix
             Keywords:                 |               Blocked By:
             Blocking:                 |  Reproduced by developer:  0
Analyzed by developer:  0              |
---------------------------------------+-----------------------------------
Comment (by Connor Worley):

 That is not true of the swscale code path. The attached file does not
 display a warning:


 {{{
 ffplay started on 2024-01-31 at 16:01:17
 Report written to "ffplay-20240131-160117.log"
 Log level: 48
 Command line:
 ffplay /Users/cworley/Downloads/dice_ycg6.mov -report -autoexit
 ffplay version 6.1.1 Copyright (c) 2003-2023 the FFmpeg developers
   built with Apple clang version 15.0.0 (clang-1500.1.0.2.5)
   configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/6.1.1_2 --enable-
 shared --enable-pthreads --enable-version3 --cc=clang --host-cflags=
 --host-ldflags='-Wl,-ld_classic' --enable-ffplay --enable-gnutls --enable-
 gpl --enable-libaom --enable-libaribb24 --enable-libbluray --enable-
 libdav1d --enable-libharfbuzz --enable-libjxl --enable-libmp3lame
 --enable-libopus --enable-librav1e --enable-librist --enable-librubberband
 --enable-libsnappy --enable-libsrt --enable-libssh --enable-libsvtav1
 --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-
 libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-
 libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma
 --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-
 libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-
 libopenjpeg --enable-libopenvino --enable-libspeex --enable-libsoxr
 --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack
 --enable-videotoolbox --enable-audiotoo  libavutil      58. 29.100 / 58.
 29.100
   libavcodec     60. 31.102 / 60. 31.102
   libavformat    60. 16.100 / 60. 16.100
   libavdevice    60.  3.100 / 60.  3.100
   libavfilter     9. 12.100 /  9. 12.100
   libswscale      7.  5.100 /  7.  5.100
   libswresample   4. 12.100 /  4. 12.100
   libpostproc    57.  3.100 / 57.  3.100
 Initialized metal renderer.
 [AVFormatContext @ 0x151b35420] Opening
 '/Users/cworley/Downloads/dice_ycg6.mov' for reading
 [file @ 0x600002e98c60] Setting default whitelist 'file,crypto,data'
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x151b35420] Format mov,mp4,m4a,3gp,3g2,mj2
 probed with size=2048 and score=100
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x151b35420] ISO: File Type Major Brand: qt
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x151b35420] Unknown dref type 0x206c7275 size
 12
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x151b35420] Processing st: 0, edit list 0 -
 media time: 0, duration: 522
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x151b35420] Before avformat_find_stream_info()
 pos: 103588 bytes read:33443 seeks:1 nb_streams:1
 [dxv @ 0x14200bc00] YOCOCG6 compression with YCG6 texture (version 3.0)
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x151b35420] All info found
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x151b35420] After avformat_find_stream_info()
 pos: 102913 bytes read:136320 seeks:2 frames:1
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
 '/Users/cworley/Downloads/dice_ycg6.mov':
   Metadata:
     major_brand     : qt
     minor_version   : 512
     compatible_brands: qt
     encoder         : Resolume
   Duration: 00:00:00.03, start: 0.000000, bitrate: 24861 kb/s
   Stream #0:0[0x1], 1, 1/15360: Video: dxv (DXD3 / 0x33445844),
 yuv420p(ycgco/unknown/unknown), 800x600, 24690 kb/s, 30 fps, 30 tbr, 15360
 tbn (default)
     Metadata:
       handler_name    : VideoHandler
       vendor_id       : FFMP
 detected 12 logical cores
 [dxv @ 0x14200bfb0] YOCOCG6 compression with YCG6 texture (version 3.0)
 Video frame changed from size:0x0 format:none serial:-1 to size:800x600
 format:yuv420p serial:1
 [ffplay_buffer @ 0x600002b94420] Setting 'video_size' to value '800x600'
 [ffplay_buffer @ 0x600002b94420] Setting 'pix_fmt' to value '0'
 [ffplay_buffer @ 0x600002b94420] Setting 'time_base' to value '1/15360'
 [ffplay_buffer @ 0x600002b94420] Setting 'pixel_aspect' to value '0/1'
 [ffplay_buffer @ 0x600002b94420] Setting 'frame_rate' to value '30/1'
 [ffplay_buffer @ 0x600002b94420] w:800 h:600 pixfmt:yuv420p tb:1/15360
 fr:30/1 sar:0/1
 [AVFilterGraph @ 0x600003899a40] query_formats: 2 queried, 1 merged, 0
 already done, 0 delayed
 Created 800x600 texture with SDL_PIXELFORMAT_IYUV.
    0.01 M-V:  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0
 [AVIOContext @ 0x151a1fb20] Statistics: 136320 bytes read, 2 seeks

 }}}
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10839#comment:5>
FFmpeg <https://ffmpeg.org>
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