[FFmpeg-trac] #11459(undetermined:new): Corruption of 608 captions data on transcode

FFmpeg trac at avcodec.org
Fri Feb 7 22:55:27 EET 2025


#11459: Corruption of 608 captions data on transcode
-------------------------------------+-------------------------------------
             Reporter:  Zach         |                    Owner:  (none)
                 Type:  defect       |                   Status:  new
             Priority:  critical     |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:  CLosed-      |               Blocked By:
  caption                            |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Comment (by Devin Heitmueller):

 Confirmed, using the following command line yields much better results, as
 the cc_fifo actually repacks the 608/708 tuples to the appropriate target
 framerate:


 {{{
 ./ffmpeg -i ../../AIM-2301.mp4 -vframes 600 -pix_fmt yuv420p -c:v libx264
 -flags +ilme+ildct -x264opts tff=1 -vf fps=30000/1001,scale=1920x1080 -b:v
 25000k -codec:a aac -ar 48000 -threads 0 AIM-2301_x264_24tohd_3000.mp4
 }}}


 (the only material difference in the above command-line from the one in
 the original ticket is the filename and using "fps=30000/1001" rather than
 "fps=29.97")
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11459#comment:2>
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