On 3/30/20, Mark Filipak <markfilipak.windows+ffm...@gmail.com> wrote: > Howdy, > > In order to make my 5-5-5-5 pull-down, anti-judder trick work with soft > telecined content (see > Details, below), I reckon I need to rewrite the 'frame_rate_code' nibble > found in the MPEG PGC's > SEQUENCE_HEADER (i.e., 0x000001B3), at offset = 7, bits 4-7 (big endian). I > need to change bits 4-7 > from '0100' (i.e., 30/1.001 FPS) to '0001' (i.e., 24/1.001 FPS). > > Do you have any ideas how/whether ffmpeg can do this? > > Details: > The "telecine=pattern=5555" filter appears to look at 'frame_rate_code'. > Since, for soft-telecined > content, 'frame_rate_code' is set to '0100' (i.e., 30/1.001 -- which is > bogus), the 'telecine' > filter miscalculates PTS times and the resulting OUT.MKV runs fast (though > audio is not affected). > The target PTS times should be 20/8*(24/1.001) because the *actual* frames > are at 24/1.001 FPS -- > it's soft telecined! But because 'frame_rate_code' is set to '0100', > 'telecine' instead calculates > PTS times as 20/8*(30/1.001). So, instead of being made at 60/1.001 FPS, > OUT.MKV is made at 75/1.001 > FPS. > > Thanks for any help/insight you can provide (and I'm sorry this is so > obscure, but a rewrite fix of > the source video is probably easier than trying to get the developers to > modify 'telecine').
You do not know what you are doing. Also soft-telecine is not supported. > > Regards, > Mark. > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
