[FFmpeg-trac] #1191(undetermined:new): qt tiff enc: make output compatible with quitcktime

FFmpeg trac at avcodec.org
Thu Apr 12 00:20:37 CEST 2012

#1191: qt tiff enc: make output compatible with quitcktime
               Reporter:  ami_stuff  |                  Owner:
                   Type:  defect     |                 Status:  new
               Priority:  normal     |              Component:
                Version:             |  undetermined
  unspecified                        |               Keywords:
             Blocked By:             |               Blocking:
Reproduced by developer:  0          |  Analyzed by developer:  0

 the output from

 ffmpeg -i j.asf -an -vcodec tiff -pix_fmt (any) out.mov

 is always identified by quicktime as 24bpp and is decoded incorrectly.

 I have found out where is a problem, please look at the attached

 The left file is an unmodified output from:

 ffmpeg -i j.asf -vcodec tiff -pix_fmt gray out.mov

 conversion, the right file is modified by me (to values which are present
 in QT TIFF 256gray generated by QuickTime) and after this change the file
 is identified and decoded correctly by QuickTime.

 (for monob 18 FF FF should be repleaced by 01 00 01)

Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1191>
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