[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 trac at avcodec.org
Mon Mar 12 00:59:08 EET 2018


#7055: Using decimate allows EIA-608 captions to pass through to MP4 files even
when the -sn option is used
-------------------------------------+-------------------------------------
             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
-------------------------------------+-------------------------------------

Comment (by navilor):

 I have uploaded the file "decimate-allows-EIA-608-captions-to-pass-
 through-S01E01.vob" via the upload page you provided. I now have
 additional information and moved the -r option to before the video codec.

 When I run the following command line using CRF captions do not come
 through.

 ffmpeg -t 00:05:00 -i decimate-allows-EIA-608-captions-to-pass-through-
 S01E01.vob -vf yadif,decimate,dejudder -pix_fmt yuv420p -vsync 1 -threads
 0 -r 23.976 -sn -vcodec libx264 -g 48 -crf 23 -preset veryfast -profile:v
 baseline -tune film -x264opts no-scenecut -an -map_metadata -1 -f mp4 -y
 S01E01-script001.mp4-video.mp4

 When I run the exact same command except I encode to bitrate captions pass
 through for both single and two pass encoding.

 ffmpeg -t 00:05:00 -i decimate-allows-EIA-608-captions-to-pass-through-
 S01E01.vob -vf yadif,decimate,dejudder -pix_fmt yuv420p -vsync 1 -threads
 0 -r 23.976 -sn -vcodec libx264 -g 48 -b:v 808385 -bufsize 1415985
 -maxrate 1010481 -preset medium -profile:v high -tune film -x264opts no-
 scenecut -an -map_metadata -1 -f mp4 -y S01E01-script001.mp4-video.mp4

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Ticket URL: <https://trac.ffmpeg.org/ticket/7055#comment:7>
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