Change the frame rate on a bunch of mp4 videos?

[Jameszzz]

I have 39 .mp4 files that I converted from DVD format but they're the wrong frame rate (29.97), and they need to be at 25.

Is there a program that can do this or should I just convert the DVDs again?

[Baldrick]

So they look jumpy when you play them?
Or must the mp4 be in 25fps for some special reason(special hardware player)?

You should try avoid any frame rate conversion because it may cause jumpy playback or sync problems.

[Jameszzz]

Yeah it looks jumpy/jerky.

[Baldrick]

Then it's best to reconvert from the dvd source. What did you convert with?

[jman98]

Are these NTSC DVDs? Because that would be the right frame rate for NTSC.

You definitely need to explain why you think you need 25 fps as you may not be correct in your thinking and may be trying to do an unnecessary conversion.

[Jameszzz]

Then it's best to reconvert from the dvd source. What did you convert with?

FormatFactory
These settings: http://img339.imageshack.us/img339/4639/ff2mg.jpg

Are these NTSC DVDs? Because that would be the right frame rate for NTSC.

You definitely need to explain why you think you need 25 fps as you may not be correct in your thinking and may be trying to do an unnecessary conversion.

I'm in Australia so I guess it's PAL.

I'm converting 2 seasons of a TV show now. The other day I converted a film DVD to 29.97 but it looked jerky when I watched it on the TV (with a now officially unsupported Western Digital Mini Media Player), so I converted it again but this time to 25, and it looked fine (but it also had all these points through the movie where there was a gap in the sound.. I don't know if they were in the 29.97 one though). So I am just assuming that I will have to do the same thing with the TV show.

The reason I think it's 25 is because I opened the DVDs in Media Player Classic and the statistics window gives me a frame rate of around 25. It actually starts off around 19 but then slowly climbs. Sometimes it reaches 24.6-24.7 but sometimes it gets to 25.

Here's what I mean: http://img820.imageshack.us/img820/9448/fps1.jpg

What's a better way of getting the FPS from a DVD?

[manono]

What's a better way of getting the FPS from a DVD?

Well, open a VOB in GSpot or MediaInfo and it'll tell you. But the resolution (720x576) already tells you it's a PAL DVD (and 25fps). Why you ever changed the framerate to 29.97fps is beyond me, though.

Yes, you'll have to start all over again. Also, that picture you showed of of the settings you used says 25fps. Maybe it's the fps of the source DVD and not for the settings you used in the program?

[Jameszzz]

What's a better way of getting the FPS from a DVD?

Well, open a VOB in GSpot or MediaInfo and it'll tell you. But the resolution (720x576) already tells you it's a PAL DVD (and 25fps). Why you ever changed the framerate to 29.97fps is beyond me, though.

I didn't know how to get the DVD statistics when I started converting. I must have just guessed 29.97 and not really thought about it.

Yes, you'll have to start all over again. Also, that picture you showed of of the settings you used says 25fps. Maybe it's the fps of the source DVD and not for the settings you used in the program?

Whoops. I took two screenshots and linked the wrong one. Edited.


Also, a question about converting. Each episode is around 28 minutes, and the converted file sizes range from 300mb to 430mb. Does this sound about right?

[budwzr]

You can retime the framerate similar to making slomo or fastmo in an NLE.

[manono]

Also, a question about converting. Each episode is around 28 minutes, and the converted file sizes range from 300mb to 430mb. Does this sound about right?

There's no way to tell from that little bit of information. We don't know the resolution, the complexity of the video, or the kind of audio, for example. In the future just do CRF encodes (constant quality encodes) for whatever quality you decide is good enough. Try 18 or so.

You can retime the framerate similar to making slomo or fastmo in an NLE.

Maybe, maybe not. What if, for example, the program converted from 25fps to 29.97fps by adding a duplicate frame after every 5 frames. Slowing it down will only make it worse. Then you'll not only have jerky playback from the added dupe frames, but also too-slow playback from the slowdown from 29.97fps to 25fps.

[budwzr]

Manono, you're right. What was I thinking. It has telecine.