[FFmpeg-trac] #7055(undetermined:new): Using decimate allows EIA-608 captions to pass through to MP4 files even when the -sn option is used

[FFmpeg]

#7055: Using decimate allows EIA-608 captions to pass through to MP4 files even
when the -sn option is used
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             Reporter:  navilor      |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:  decimate cc  |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by tmm1):

 I'm not sure why decimate changes behavior, but caption data is embedded
 in mpeg2 user data and is not considered a subtitle by ffmpeg. You can
 control whether or not the libx264 encoder includes the caption data in
 the output video using the -a53cc option. There is also a patch on the
 list I submitted a couple days ago for a mpeg2_metadata_bsf option to
 remove a53 data from the mpeg2 bitstream.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7055#comment:10>
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