interlaced ntsc

[sepultribe]

i own a movie, its a live from a famous metal band, and i cant encode it correctly. i have the latest versions of gordian knot, i have read all the guides about gk and i have successfully converted movies to divx. so i am not a newbie. im having this problem with this special dvd. dgindex says its ntsc with iterlaced frame type. i have tried ivtc (in the save and encode window of gk), just interlace with blend, 2 cds anything and the quality is still low. i mean i get artifacts , i think they are callled like that, i mean the picture gets pixel-style in some parts...

so if anyone knows, whats the right way to encode this kind of movies....

thanks

[jggimi]

Hello, and welcome to the forum.

Do NOT use Inverse Telecine (IVTC) unless the content was originally Telecined. You won't be able to tell unless you examine the content frame-by-frame.

See www.doom9.org/ivtc-tut.htm for assistance.

[sepultribe]

so what i should do is deinterlace? what type should i use? blend or no blend?

thanks in advance

[manono]

Hi-

If it needs deinterlacing, of the choices available in the current Gordian Knot, I'd pick KernelDeint.

Now, some of those concert DVDs are extremely difficult to compress, some of the most difficult of any type of DVD. Did you run a compression test to get an idea of the final quality before doing the encoding? The artifacts you mention could be from lack of bitrate, and not the deinterlacer used.

[sepultribe]

yes. i always run a test before encoding. the default 5% comp test showed .500. So i went for 2 cds although it was really strange that even with that the percentage was slightly over 40%, which is a bit lame for 2 cds and a video of 2hours or so. I've encoded bigger movies and the quality was far better...

anyway i did field deinterlace with no blend and the quality is fair.

[Nick]

Originally posted by sepultribe
I've encoded bigger movies and the quality was far better...


This doesn't surprise me in the least. Essentially, as I'm sure you know, it is motion which requires bitrate. Anything filmed on hand-held equipment has a lot more motion involved than, say, a scene in a film where the backdrop stays steady and only the actors move.

Hence these are really difficult to compress. When I used to back this sort of thing up to SVCD before I had a DVD burner, I used to have to budget 1 disc per 25 min as a rule of thumb for acceptable quality.