[FFmpeg-user] How to change video fps from 29.970 to 25?
damian at artnmedia.pl
Tue Sep 2 08:21:59 CEST 2014
Hi, Arno. Thank you for advice, I will check it. I also found some information about converting videos from 29.970 to 23.976:
In document above you can find some techniques to convert your videos. There are methods for conversion from 29.970 to 23.976 called:
- 3:2 Pulldown Removal,
- 2:3:3:2 Pulldown Removal
- Duplicate Frame Removal (bad)
Is it possible to use them in FFMPEG?
If I can convert from 29.970 to 23.976 than I can easily convert 23.976 to 25.
Your Magic might be called "optical flow".
It's technique where the movement of (all) pixels in the image is turned into a vector. Once you have these vectors you can tell them for instance to take move slower or faster. This generates very smooth speed changes.
There's a huge lot of other things you can do once you have this information.
There's an open source project that seems to work with ffmpeg here:
I haven't tried this one myself. I have used commercial versions of the algorithms.
Maybe it will give you better results.
ffmpeg-user mailing list
ffmpeg-user at ffmpeg.org
More information about the ffmpeg-user