Change MP4 FPS Without Re-Encoding

audiohominis · 16th August 2010, 18:30

Hi all.
Normally, I would de-mux, then re-mux to change the FPS of a H.264 MP4. However, a couple of days ago I came across a nifty command line snippet for mplayer that did just that in one step. Unfortunately, I neglected to save the text and now, for the life of me, I can't find it again.
Little help?

I should mention that I'm having to do this because when YAMB joins multiple H.264 streams to an MP4 file, for some reason, it takes the freedom to also change the FPS from 24 to 25 without my consent, so I would also appreciate tips on preventing the app from doing that.
Thanks

sneaker_ger · 16th August 2010, 20:06

I don't know the mplayer command line but you could try mp4box (that yamb uses) directly using the following commandline:
mp4box -cat video1.mp4 -cat video2.mp4 output.mp4
That should join two (or more) files and not change the fps. Both Yamb and mp4box are pretty buggy (from my experience) but this simple command line should work in most of the cases.

16th August 2010, 18:30	#1 \| Link
audiohominis Registered User Join Date: Jan 2006 Posts: 129	Change MP4 FPS Without Re-Encoding Hi all. Normally, I would de-mux, then re-mux to change the FPS of a H.264 MP4. However, a couple of days ago I came across a nifty command line snippet for mplayer that did just that in one step. Unfortunately, I neglected to save the text and now, for the life of me, I can't find it again. Little help? I should mention that I'm having to do this because when YAMB joins multiple H.264 streams to an MP4 file, for some reason, it takes the freedom to also change the FPS from 24 to 25 without my consent, so I would also appreciate tips on preventing the app from doing that. Thanks __________________ CPU: Intel® Core™i7 930 @ 2.80GFz 2.79 GHz (8 cores) GPU: NVIDIA® GeForce® GTS 250 SYS: Windows 7 Ultimate x64 RAM: 6.00 GB

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16th August 2010, 20:06	#2 \| Link
sneaker_ger Registered User Join Date: Dec 2002 Posts: 5,565	I don't know the mplayer command line but you could try mp4box (that yamb uses) directly using the following commandline: mp4box -cat video1.mp4 -cat video2.mp4 output.mp4 That should join two (or more) files and not change the fps. Both Yamb and mp4box are pretty buggy (from my experience) but this simple command line should work in most of the cases.