[FFmpeg-trac] #2005(avcodec:new): Wrong palette colors with DVD subtitles encoding

[FFmpeg]

#2005: Wrong palette colors with DVD subtitles encoding
------------------------------------+-----------------------------------
             Reporter:  ubitux      |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  avcodec
              Version:  git-master  |               Resolution:
             Keywords:  dvdsub      |               Blocked By:
             Blocking:              |  Reproduced by developer:  1
Analyzed by developer:  0           |
------------------------------------+-----------------------------------

Old description:

> Generate a reference file:
>
> {{{
> ./ffmpeg -f lavfi -i testsrc=s=720x480:d=400 ref.mkv
> }}}
>
> Mux DVD subtitles in:
>
> {{{
> ./ffmpeg -i ref.mkv -i ~/fate-samples/sub/vobsub.idx -c copy -y test-
> remux.mkv
> }}}
>
> Here, colors are fine (yellow foreground):
>
> {{{
> mpv   --start=03:00 test-remux.mkv
> mplayer   -ss 03:00 test-remux.mkv
> mplayer2 --ss=03:00 test-remux.mkv
> }}}
>
> Note: mpv¹ and vlc show this properly, mplayer and mplayer2 display them
> in black & white (which is fine), ffplay seems to have various troubles.
>
> Now encoding DVD subtitles in:
>
> {{{
> ./ffmpeg -i ref.mkv -i ~/fate-samples/sub/vobsub.idx -c copy -c:s dvdsub
> -y test-encode.mkv
> }}}
>
> Problem: the colors of the subtitles are negated (or shuffled dunno).
> They also appear differently with players displaying them in black and
> white.
>
> [1]: a mplayer2 fork https://github.com/mpv-player/mpv/,
> https://github.com/mpv-player/mpv/blob/master/DOCS/man/en/changes.rst

New description:

 Generate a reference file:

 {{{
 % ./ffmpeg -f lavfi -i testsrc=s=720x480:d=400 ref.mkv
 }}}

 Mux DVD subtitles in:

 {{{
 % ./ffmpeg -i ref.mkv -i ~/fate-samples/sub/vobsub.idx -c copy -y test-
 remux.mkv
 }}}

 Here, colors are fine (yellow foreground):

 {{{
 mpv   --start=03:00 test-remux.mkv
 mplayer   -ss 03:00 test-remux.mkv
 mplayer2 --ss=03:00 test-remux.mkv
 }}}

 Note: mpv¹ and vlc show this properly, mplayer and mplayer2 display them
 in black & white (which is fine), ffplay seems to have various troubles.

 Now encoding DVD subtitles in:

 {{{
 % ./ffmpeg -i ref.mkv -i ~/fate-samples/sub/vobsub.idx -c copy -c:s dvdsub
 -y test-encode.mkv
 ffmpeg version N-47665-g18eb319 Copyright (c) 2000-2012 the FFmpeg
 developers
   built on Dec  9 2012 18:50:45 with gcc 4.7.2 (GCC)
   configuration: --enable-gpl --enable-fontconfig --enable-libfreetype
 --enable-libmp3lame --enable-libvorbis --enable-libxvid --enable-libx264
 --enable-libvpx --enable-libtheora --enable-x11grab --enable-libopenjpeg
 --enable-libass --enable-libmodplug --enable-libv4l2 --cc=colorgcc
 --samples=/home/ubitux/fate-samples --prefix=/tmp/ffinstall --enable-
 runtime-cpudetect --enable-libcelt
   libavutil      52. 12.100 / 52. 12.100
   libavcodec     54. 79.101 / 54. 79.101
   libavformat    54. 48.100 / 54. 48.100
   libavdevice    54.  3.102 / 54.  3.102
   libavfilter     3. 26.101 /  3. 26.101
   libswscale      2.  1.103 /  2.  1.103
   libswresample   0. 17.102 /  0. 17.102
   libpostproc    52.  2.100 / 52.  2.100
 Input #0, matroska,webm, from 'ref.mkv':
   Metadata:
     ENCODER         : Lavf54.48.100
   Duration: 00:06:40.08, start: 0.000000, bitrate: 49 kb/s
     Stream #0:0: Video: h264 (High 4:4:4 Predictive), yuv444p, 720x480
 [SAR 1:1 DAR 3:2], 25 fps, 25 tbr, 1k tbn, 50 tbc (default)
 [vobsub @ 0x18e79a0] Estimating duration from bitrate, this may be
 inaccurate
 Input #1, vobsub, from '/home/ubitux/fate-samples/sub/vobsub.idx':
   Duration: N/A, bitrate: N/A
     Stream #1:0[0x0](en): Subtitle: dvd_subtitle (default)
 Output #0, matroska, to 'test-encode.mkv':
   Metadata:
     encoder         : Lavf54.48.100
     Stream #0:0: Video: h264, yuv444p, 720x480 [SAR 1:1 DAR 3:2], q=2-31,
 25 fps, 1k tbn, 1k tbc (default)
     Stream #0:1(en): Subtitle: dvd_subtitle (default)
 Stream mapping:
   Stream #0:0 -> #0:0 (copy)
   Stream #1:0 -> #0:1 (dvdsub -> dvdsub)
 Press [q] to stop, [?] for help
 frame=10000 fps=884 q=-1.0 Lsize=    2507kB time=00:06:39.96 bitrate=
 51.3kbits/s
 video:2369kB audio:0kB subtitle:72 global headers:0kB muxing overhead
 2.711231%
 }}}

 Problem: the colors of the subtitles are negated (or shuffled dunno). They
 also appear differently with players displaying them in black and white.

 [1]: a mplayer2 fork https://github.com/mpv-player/mpv/,
 https://github.com/mpv-player/mpv/blob/master/DOCS/man/en/changes.rst

--

Comment (by ubitux):

 When encoding and muxing to nut (which seems to be the only other format
 where muxing dvd subtitles is possible), the subtitles don't appear at
 all… (but they do on remux). So it's hard to tell.

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2005#comment:3>
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