Framerates?

Wolfy2hk · Post by **Wolfy2hk** » Sun Sep 09, 2007 9:18 pm

Im have questions about how you save an amv to a specific framerate like 30 fps or 23 fps, does it matter, does it lag the video if the framerate is different from the original framerate?

Kariudo · Post by **Kariudo** » Sun Sep 09, 2007 10:56 pm

most anime is at 29.97 fps, when you get anime off of dvd's it is usually interlaced.
Most people use a process called Inverse Telecine (IVTC) to restore the progressive frames...which brings the framerate down to 23.98 fps.

restoring the progressive frames usually makes the video look better, and makes it easier to sync...so it does matter.

There really isn't any lag like you encounter when playing resource intensive video games. If you do encounter lag, chances are that it's because you don't have enough cpu power or ram to play the video.

this'l probably answer any other questions you have

Scintilla · Post by **Scintilla** » Mon Sep 10, 2007 5:44 pm

Kariudo wrote:Most people use a process called Inverse Telecine (IVTC) to restore the progressive frames...which brings the framerate down to 23.976 fps.

Fixed.

Yes, the difference is significant. If you see an editing program that offers a timebase option for 23.98, don't use it with IVTCed NTSC footage. It is not the same thing and it will cause you trouble.

Qyot27 · Post by **Qyot27** » Mon Sep 10, 2007 9:00 pm

The only time a video will lag is when the computer's hardware can't keep up with how fast the video needs to be decoded, or the format's software decoders aren't optimized enough. Sometimes this is a matter of format, sometimes resolution, and sometimes it's a matter of framerate, although unless you're using H.264 and/or framerates like 60fps, or pretty much anything HD, especially with the other two points, you shouldn't run into it (each of these differs greatly based on how new the computer's hardware is). Even given those variables, however, playback lag is better attributed to bitrate spiking too high - something that resolution and framerate can contribute to, but only if one is using a Constant Quality mode. In fact, higher framerates actually tend to make motion look smoother, provided we're dealing with progressive video or stuff that's already been telecined.