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Converting 23.976 fps Non Drop Frame to 23.976 fps Drop Frame
Hi,
I have searched for a solution for this problem, but I don’t seem to be able to find one, so I hope someone can help me.
I have a .avc file which in this case is 1980×1080 23.976 fps with the duration 01:32:20
The file is used for a Blu-ray production.On the blu ray I need subtitles, but my subtitle program Annotation Edit doesn’t support .acv files, so I have to convert the .avc file into a .mov (in order to be sure that the subtitles is in sync)
The .mov file (Apple Prores 422) is still 1980×1080 23.976, but FCP, Compressor and Annotation Edit say that it is 01:32:14, even though QuickTime 7 says it is 01:32:20.
This means that I make subtitles that suit a duration 01:32:14, but when I play back the movie on my Bluray player the movie is 01:32:20 and the subtitles don’t fit.This seems to be caused by the .avc file is Drop Frame and the .mov is Non Drop Frame.
Annotation doesn’t seem to support 23.976 fps Drop Frame (but supports 29.97 fps Drop Frame)
So what I want now is to make a .mov file that is 01:32:14 and then compress it to a .h264 file with a duration of 01:32:14.
Because if I do that with my existing .mov file it ends up as a .h264 with a a duration of 01:32:20.So how do I make a .mov file with the duration of 01:32:14 that stays 01:32:14 when I compress it to a .264 file?
Best Regards
Jost L. Hansen
-Denmark -
2 Replies
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I don’t know what to say, other than 23.98 is NDF only. There is no such thing as 23.98DF. The format doesn’t exist. So the issue is that the subtitle program doesn’t support the 23.98 frame rate. You gotta get on them for that. They SHOULD support it. It’s a very common frame rate.
Shane
Little Frog Post
Read my blog, Little Frog in High Def -
just to chip in to an old thread to save someone some time.
this problem exist also on avid 23.976 projects, where the content exported to QT from the timeline is longer than the TC tells you it is.
and the conversion factor is 30/29.97 – which can then be used as a base of adjusting timings of subtitles. which basically means that the TC IS drop frame-adjusted.
i’m not sure where this comes from, but suspect there’s some legacy 30i problematic going on. quite a bit of extra work results – not to mention the time wasted figuring out what actually IS going on when durations don’t match.
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