[TAG] frame rate of VCD and DVD

[Karl-Heinz Herrmann]

Hi,

On Fri, 20 Oct 2006 17:34:54 +0700
Mulyadi Santosa <mulyadi.santosa at gmail.com> wrote:
> I face a trouble here. Does anyone know the frame rate of VCD and DVD? 

that depends (what else?)

PAL uses 25 frames per second (European format)
NTSC uses either 23.976 or 29.97 frames per sec. (US standard)

This is complicated by interlaced/non interlaced material. 

TV is usually interleaved, i.e. every this frame contains every odd line,
every other frame every even line of an image. That allows a 50Hz
vertical rate of European TV's while only having 25 full images per
second. If done right, the interleaved frames contain actual information
at 50Hz i.e. you get the infamous stripes if you simplistically glue the
two interleaved frames together. 

> Also, what is the fps (frame per second) of movie trailers spreading on 
> Internet? What is the right way to calculate the fps? 

Usually the same as the source material (i.e. PAL or NTSC).
 
> My another problem is, suppose I have a video clip which has 30 fps. 
> What should I do if I want to double the fps (i.e 60 fps)? Is there any 
> tool available to do this?

None that I'm aware of, you would have to interpolate along the time axis. 

Linux tools I'm aware of are dvdrip (perl gui frontend) and transcode
which does all the work (used heavily by dvdrip). The CLI of transcode
is *horrible* so dvdrip is strongly recommended.

If a tool can upsample from 30 to 60 fps it might be transcode. 

mplayer/mencoder is also versatile player/encoder. 


K.-H.