Author Topic: Adjust the frame rate of mp4 files?  (Read 2959 times)

Offline Scorps

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Adjust the frame rate of mp4 files?
« on: March 03, 2012, 09:56:00 AM »
Is there any off the shelf software that allows you to adjust the frame rate of an mp4 file?

If not, what is the easiest way to automatically adjust the frame rate?

I'm working on a project that has a motor and I'd like to be able to sync the motor with the speed of the mp4 viedo.
Dave

Offline yetanotherid

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Re: Adjust the frame rate of mp4 files?
« Reply #1 on: March 13, 2012, 06:28:58 PM »
Any software which will re-mux video (copying the video stream rather than re-encoding) should be able to change the frame rate in the process.

Yamb for MP4s
MKVMergeGUI for MKVs. It's part of MKVToolNix (MKVMergeGUI will also open other file types such as MP4 and AVI and re-mux them as MKVs)
Virtualdub for AVIs (you need to select "direct stream copy" from the video menu after changing the frame rate).

If it doesn't matter if the re-muxed video is an MKV rather than an MP4, MKVMergeGUI is easier to use and faster than YAMB.

Of course the above will only change the frame rate of the video. If there's an audio stream which you need to keep in sync with the video then you'd probably need to re-encode it while changing it's speed to match. Getting that right can be a bit of a process. MKVMergeGUI does have a function for time stretching the audio stream, but how successfully it works depends on the type of audio.