Hi,
I was trying to put a new subtilte stream to a DVD movie. I demuxed the audio and video and added the subtiltes in Maestro but I noticed that before demuxing /checked with VdubMPEG/ the video was 29.97 fps and after that the .m2v file is already 23.967fps so I had to change the subtiltes speed. After reauthoring the video remained 23.976fps but it's playing OK on several DVD players I tried. Any idea what's going on?
Cheers!
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Most NTSC DVDs have the movie encoded at 23.97fps with RFF/TFF flags embedded in the stream which instruct the DVD player to play it back at 29.97fps. Its an encoding technique used to get around the extreme inefficiency of NTSC encoding. Depending on what software you are using to analyze the stream, it may or may not parse the flag so some programs will report it as 29.97fps and some will report it as 23.976fps.
If all you did was demux then the flag is still intact. There is no reason to adjust the subs because the movie still plays back at 29.97fps. -
Thank you for your reply.
I needed however to adjust the subtiltes because at 29.97fps they were playing too fast during the preview in Maestro and now at 23.976 they're OK.
What is interesting when parsing in VdubMPEG is canceled in the beggining of the .m2v file File Information returns 29.97fps and a bitrate of 5836 kbps but if you leave it to parse the whole file it shows 23.976 and some strange bitrate of -536 kbps.
Cheers!
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