Change FPS in Handbrake or other

[loninappleton]

I had difficulties with the Handbrake ability to change from 23.93 to 25 FPS. Repeated attempts just seemed to ignore the 25fps instruction at the Video tab. This British older video would normally be found at the PAL standard of 25 FPS but Handbrake shows no change in Mediainfo after I tried it several times.

[Alwyn]

That's odd, I just tried here on a 23.976fps MPEG file and Handbrake successfully changed it to 25fps. All I did was set 25 in the droplist and ticked "Constant Framerate".

Can you attach your file here or put it on Google Drive (or similar) so we can take a look?

Are you into AVISynth? If so, you can speed it up using AsssumeFPS(25).

[jagabo]

I'm pretty sure that setting in Handbrake won't do what you want anyway. It will duplicate (to increase the frame rate) or discard (to decrease the frame rate) frames to achieve the new frame rate without changing running time (making the video jerky). And, of course, it will re-encode the entire movie.

[loninappleton]

Thanks for the tips. If jagabo says it's a bad plan he usually has the answer. I haven't had hands on AVIsynth for many years. Will see if constant framerate completes the change just out of curiousity.

The alternative is to use a Handbrake synching function for a known subtitle for this video. It was out of whack and I spotted the FPS difference from usual British releases. I'm just not good at seeing the "it's getting worse as it plays" due to FPS differences between subs and video.

The other question I had was about the Handbrake profile settings. When does FPS kick in for Handbrake: when the srt is loaded or how when does it work? In other words perhaps I can alter the framerate on the subtitle.

In between I'll just try to sync it and see if that works.

[jagabo]

Try using one of the ffmpeg GUI front ends like Clever FFmpeg GUI. That will allow you to change the frame rate without re-encoding (just the timestamps are modified) so the movie will play about 4 percent faster.

Be forewarned that releases in different countries are often different cuts of the movie. So a simple speedup may not sync the subs you have.

[videoAI]

@loninappleton

If your video and audio are in sync, but your subs aren't,
then the easiest way is to find a sub online that matches
your video current FPS.

Another option is to change the subtitle FPS that you have
by using a program or an online service.


[Attachment 88335 - Click to enlarge]

Clever FFmpeg-GUI is also a great program to try