24FPS encoded AVI playback on TV

[ric9887]

I have read a lot of the tutorial on this site and others with regards to encoding telecined NTSC source DVD's to DivX/Xvid. I can understand that it allows the encoder to encode more efficiently if the source DVD is IVTC'd, before the encode as there are less frames to encode.

If I wish to play back the AVI on a TV then how does it being 24(ish) FPS effect the playback ? (assuming the TV allows NTSC playback, 60hz etc)

I have an Archos AV480 on which to play the AVI and watch on a TV, but am not sure if I should IVTC the source, encode and leave it at 24fps, or just leave the source at 30fps and encode and just swallow the overhead incured by this.

I read a little about the pulldown utility which flags an mpeg stream and thus does not require the extra frames to be in the file. Is there a way DivX/Xvid do the same ?

I am not sure if somehow the Archos is able to telcine a 24 fps DivX/Xvid on the fly (if that is even nessessay).

I hope I have explained this well enough.
Any help would be appreciated.

[jggimi]

Your player will pulldown in order to produce 29.97fps from your 23.976 file. If you leave Telecined content at 29.97, you will waste 20% of your bitrate.

[jellysandwich]

It's not about efficiency so much as quality. If your source is telecined, then IVTC it. You'll see lots of nasty combing artifacts if you don't IVTC when you need to.

Edit: Guess it is about efficiency, good to know.

js

[CWR03]

There are things to know about telecined video before you begin - it is a method of converting normal 24fps film to 29.97 DVD video, and if you encode the source to XviD it will have to blend some frames together to keep it at 29.97. IVTC converts it back to 24fps which should look smoother in camera pans because the frames aren't being spread in an odd manner. The only way to know what will look good to you is to try a few samples each way and see.

[jggimi]

...it will have to blend some frames together...Not necessarily; if it was a modern Telecine through a digital pulldown, then Telecide() can reassemble frames with no deinterlacing -- no blending or interpolation of fields needed.