[FFmpeg-trac] #10103(undetermined:new): mov enc: QT doesn't like TIFF GRAY8 in MOV created by ffmpeg

[FFmpeg]

#10103: mov enc: QT doesn't like TIFF GRAY8 in MOV created by ffmpeg
-------------------------------------+-------------------------------------
             Reporter:  ami_stuff    |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 TIFF GRAY8 in MOV created by ffmpeg decodes incorrectly with QT Player,
 because QT Player expects 0x28 instead of 0x18 in stsd atom.

 Attached patch fixes the problem, but I'm not sure if it's the best
 solution.


 If it's not then please fix the issue whatever way you like.


 avctx->bits_per_coded_sample is set to 0x28 for GRAY8 in tiff encoder, but
 it's not forwarded to mov muxer, where it's always set to 0:

 {{{
     case AV_PIX_FMT_GRAY8:
         avctx->bits_per_coded_sample = 0x28;

 }}}

 {{{
 ./ffmpeg -i 160.bmp -vcodec tiff -pix_fmt gray gray.mov
 ffmpeg version N-109332-g45ab5307a6 Copyright (c) 2000-2022 the FFmpeg
 developers
   built with gcc 9 (Ubuntu 9.4.0-1ubuntu1~20.04.1)
   configuration: --enable-libopenjpeg
   libavutil      57. 43.100 / 57. 43.100
   libavcodec     59. 54.100 / 59. 54.100
   libavformat    59. 34.102 / 59. 34.102
   libavdevice    59.  8.101 / 59.  8.101
   libavfilter     8. 51.100 /  8. 51.100
   libswscale      6.  8.112 /  6.  8.112
   libswresample   4.  9.100 /  4.  9.100
 Input #0, bmp_pipe, from '160.bmp':
   Duration: N/A, bitrate: N/A
   Stream #0:0: Video: bmp, bgr24, 160x120, 25 fps, 25 tbr, 25 tbn
 Stream mapping:
   Stream #0:0 -> #0:0 (bmp (native) -> tiff (native))
 Press [q] to stop, [?] for help
 Output #0, mov, to 'gray.mov':
   Metadata:
     encoder         : Lavf59.34.102
   Stream #0:0: Video: tiff (tiff / 0x66666974), gray(pc, progressive),
 160x120, q=2-31, 200 kb/s, 25 fps, 12800 tbn
     Metadata:
       encoder         : Lavc59.54.100 tiff
 frame=    0 fps=0.0 q=0.0 size=       0kB time=-577014:32:22.77 bitrate=
 -0.0kbframe=    1 fps=0.0 q=-0.0 Lsize=      20kB time=00:00:00.00
 bitrate=N/A speed=   0x
 video:19kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 3.705027%
 }}}
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10103>
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