[FFmpeg-trac] #726(undetermined:open): support for copying SMPTE 436M caption tracks

[FFmpeg]

#726: support for copying SMPTE 436M caption tracks
-------------------------------------+-------------------------------------
             Reporter:  dericed      |                    Owner:
                 Type:  enhancement  |                   Status:  open
             Priority:  wish         |                Component:
              Version:  git-master   |  undetermined
             Keywords:  cc mxf       |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  1
-------------------------------------+-------------------------------------

Comment (by funman):

 Here is the 16 bytes header before CDP:
 (bytes) - desc
 (2) - Number of ANC packets
 (2) - VANC Line number
 (1) - Wrapping type (bit 4 is HANC if set, VANC if not).
   bits 2-0:
     1 == interlaced or spf frame
     2 == field 1
     3 == field 2
     4 == progressive frame
 (1) - payload sample config
   4 == 8 bit luma
   5 == 8 bit color difference
   6 == 8 bit luma & color difference
   7 == 10 bit luma
   8 == 10 bit color difference
   9 == 10 bit luma & color difference
  10 == 8 bit luma with parity
  11 == 8 bit color difference with parity
  12 == 8 bit luma & color difference with parity
 (2) - payload sample count (bytes following 16 bytes header)
 (8) - ???

 For the attached sample the last 8 bytes are 0000 004c 0000 0001, for
 another sample I have it's 0000 0050 0000 0001
 It could be some variation of the "ADF" Ancillary Data Flag which is 0x000
 0x3ff 0x3ff

--
Ticket URL: <https://trac.ffmpeg.org/ticket/726#comment:10>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker