why 25fps avi or 23.97fps avi

[theewizard]

why do people rip an NSTC video 29.97 fps then change the frame rate

doesn't avi Xvid or Dvix support the original frame rate

if you have PAL dvd at 25fps interlaced ? 50 fps progressive ?

I understand making a 25fps avi

but why do this to a NTSC DVD ?

what is gained by this, besides making the file slightly smaller ?

the PC will play all frame rates, will not the stand alone DVD player also play the correct original frame rate ? even though it's an AVI file ?

[jagabo]

why do people rip an NSTC video 29.97 fps then change the frame rate

They don't. Most NTSC movies are 23.976 progressive with pulldown flags (the DVD player creates the 59.94 fields per second video for SD TV). So they rip the video as 23.976 fps progressive. Most PAL movies are 25 fps progressive. So PAL rips are usualy 25 fps.

doesn't avi Xvid or Dvix support the original frame rate

AVI supports bitrates from ~1/4,000,000,000 fps to ~4,000,000,000 fps.

[lordsmurf]

Do you really mean "rip" from a DVD?
Or are you using the wrong term for referring to television recordings?

If tv recordings, and 23.976, then it depends.
(1) Some video can be IVTC'd back to progressive and look good.
(2) Some video cannot, and the people encoding are idiots.

[theewizard]

why do people rip an NSTC video 29.97 fps then change the frame rate

They don't. Most NTSC movies are 23.976 progressive with pulldown flags (the DVD player creates the 59.94 fields per second video for SD TV). So they rip the video as 23.976 fps progressive. Most PAL movies are 25 fps progressive. So PAL rips are usualy 25 fps.

doesn't avi Xvid or Dvix support the original frame rate

AVI supports bitrates from ~1/4,000,000,000 fps to ~4,000,000,000 fps.

OK your saying the movies on a dvd are already 23.976 ?

and the dvd player makes this 59.94 for playing on the TV

well, learn something everyday,

[edDV]

Some background.
http://www.dvdfile.com/news/special_report/production_a_z/3_2_pulldown.htm

The same applies to 480i and 1080i digital video.

720p is broadcast with 59.94 frames per second. In that case 23.976 fps film source is frame repeated three then two to get to 59.94.

[theewizard]

i new film was telecined for broadcast, but I thought it was different when placed on DVD, especially when so much stuff is now done with video cameras NOT film cameras

[guns1inger]

Highend digital video like that used by Lucas, Soderberg et al shoots at 24 fps progressive - film speed.

[edDV]

i new film was telecined for broadcast, but I thought it was different when placed on DVD, especially when so much stuff is now done with video cameras NOT film cameras

Do you mean when HDTV video cameras substitute for 35mm Film?

In most cases for TV series or movies, HDTV cameras are run at progressive 24 fps just like film and follow a similar electronic production process*.

When broadcast, HD camera sourced material comes as telecined 1080i/29.97 or as 720p/59.94 same as film.

News/sports/reality/variety is usually shot 1080i or 480i interlace.


* among other reasons, this is done for easy release to 25 fps PAL and as progressive DVD.

[jman98]

why do people rip an NSTC video 29.97 fps then change the frame rate

They don't.

I have actually seen this done, but it's been a while. You might be surprised at what kinds of things stupid people do when encoding to Divx. My personal favorite is the use of 22 KHz audio, which many foolishly believe results in files "half the size" of those using 44.1 KHz audio. Of course that's not true as the bit rate, not the KHz, determines the file size when encoding, so people who use 22 KHz audio are just screwing the audio for no good reason at all. I did read that there are a few primitive playback devices that require 22 KHz audio (cellphones? Not sure.) but I think most people who use 22 KHz audio do so out of ignorance. Years ago I saw a Divx encode of a Jet Li DVD where the guy who encoded it used something like 15 fps, so I know that there certainly are stupid people out there who do change frame rates for no good reason.