The right frame rate?? (fps)

krabman · Post by **krabman** » Mon Apr 28, 2008 8:36 pm

Hi everybody

I tried to make a clip from my DVD using two different software to see which one works better.

But one software made my clip 23.976 fps and the other made it 29.97 fps.

How can I know which is the right one? And why did this happen to me anyway? How can there be 2 different frame rates from the same DVD that I'm using?

I'm going crazy from all of this LOL

LivingFlame · Post by **LivingFlame** » Mon Apr 28, 2008 8:43 pm

Either one of your programs telecined the footage when you ripped it, or one of them IVTC'd (inverse telecined) it when you ripped it. That's about all I can figure. The 23.976 should be progressive footage though, so that would be the ideal choice.

krabman · Post by **krabman** » Mon Apr 28, 2008 9:06 pm

I think you may be right about the telecine and the inverse-telecine thing.

How can I know which one is the right way to go in the future?

I find it to be very confusing.

btw, when I watch the 23.976 fps version and the 29.97 fps version, they both look fine to me. So I wonder what is the difference really?

I am trying to learn about this but everytime I search I always find guides an tutorials but they explain things way to technical for beginners like me. And I really don't know what they are talking about. I end up reading one guide and in the end instead of learning anything I have a list of 10 new things that I have to google and learn about, which then brings even more new things to learn about and it just gets into a whole endless cycle and at the end of the day I basically learned that I must be a moron or something...

Is there any place I can learn about framerates and find out how to choose the right one that is geared towards "non-techie" guys like me?

LivingFlame · Post by **LivingFlame** » Mon Apr 28, 2008 9:26 pm

Well, this is like the all encompassing guide of awesome. It gets technical, but it explains its technicalities.

As for which to go with, progressive is always better than interlaced. Most anime is originally progressive but has to be interlaced to look right on NTSC television screens. (TVs need interlaced sources because they play things 1 field at a time instead of 1 frame at a time. 1 frame = 2 fields. HDTVs that play 720p and 1080p are excluded, as far as I'm aware.) The IVTC basically reassembles the interlaced footage back into the original progressive footage. The progressive footage will look cleaner and is preferred for making AMVs.

This is the section of the guide I posted at the beginning of this post that gets into detail about interlaced and progressive footage.

krabman · Post by **krabman** » Mon Apr 28, 2008 10:29 pm

HI LivingFlame,

That guide is actually one of the guides that a read during my searches. I happened to think that it was the best guide out of all the other ones I've read so that's why I joined this forum.

I just did a frame-by-frame compariso of the two videos I made and I can definitely see the duplicate frames in the 29.97 fps version over the 23.976 fps version. But during normal playback I don't notice any difference.

Also, you have mentioned that progressive is always better than interlaced but it seems that both my videos are progressive as I cannot see any interlacing in any of the frames for both versions.

I really need to figure out how to determine when I need to de-interlace or telecine or IVTC, and now I found a new thing called decimate so I guess I'll learn about that and see what it is... man this stuff is tough... it's like everytime I think I finally learned something, I realize that I didn't really learn anything.

BasharOfTheAges · Post by **BasharOfTheAges** » Mon Apr 28, 2008 11:12 pm

krabman wrote:I just did a frame-by-frame compariso of the two videos I made and I can definitely see the duplicate frames in the 29.97 fps version over the 23.976 fps version. But during normal playback I don't notice any difference.

That's kinda the point. During playback you won't notice differences. But if you go frame by frame or alter the speed or move the video around at all it'll be very noticeable.

krabman · Post by **krabman** » Tue Apr 29, 2008 2:29 am

BasharOfTheAges wrote:
krabman wrote:I just did a frame-by-frame compariso of the two videos I made and I can definitely see the duplicate frames in the 29.97 fps version over the 23.976 fps version. But during normal playback I don't notice any difference.
That's kinda the point. During playback you won't notice differences. But if you go frame by frame or alter the speed or move the video around at all it'll be very noticeable.

So does this mean that both ways are acceptable? I mean, since I can't notice the difference just by watching normally, so does this mean it is really nothing for me to worry about?

Sometimes I take things like this to seriously so maybe I am just making it a problem when it really isn't. I don't know

Does it really matter if my video comes out at 23.976 fps or 29.97 fps?

BasharOfTheAges · Post by **BasharOfTheAges** » Tue Apr 29, 2008 11:38 am

krabman wrote:
BasharOfTheAges wrote:
krabman wrote:I just did a frame-by-frame compariso of the two videos I made and I can definitely see the duplicate frames in the 29.97 fps version over the 23.976 fps version. But during normal playback I don't notice any difference.
That's kinda the point. During playback you won't notice differences. But if you go frame by frame or alter the speed or move the video around at all it'll be very noticeable.
So does this mean that both ways are acceptable? I mean, since I can't notice the difference just by watching normally, so does this mean it is really nothing for me to worry about?

Sometimes I take things like this to seriously so maybe I am just making it a problem when it really isn't. I don't know

Does it really matter if my video comes out at 23.976 fps or 29.97 fps?

In general, you could edit with either. You need to pick one or the other though. If you have both, parts are going to look wrong after you edit.

krabman · Post by **krabman** » Tue Apr 29, 2008 10:28 pm

OK thanks

So basically both frame rates are good and one isn't necessarily better than the other.

I was worried that one of the softwares I was using was messing up the video but I guess they are both good.

Thanks!