Why doesn't GKnot use colormatrix?

[drcl]

the title says it all...

[manono]

Hi-

It's not needed in many (most?) cases. There's nothing to prevent you from sticking it in the script yourself. The only filter on by default is Undot.

[drcl]

From my experience most DVDs use Rec.709 (or similar) co-efficients.

Did I misunderstand the use of this filter?

I thought that this was useful to correct color differences, if you had a source like a DVD, encoded with Rec.709, and wish to transcode it to a Rec.601 format like mpeg4, mpeg1 or maybe mpeg2 with tmpg.

[unskinnyboy]

You understood the use of this filter alright, but your answer lies in your question itself -> *most* DVDs use ITU-R BT.709, but not *all*. There are many DVDs which uses SMPTE 170M or ITU-R BT.480-2 or even something else. Then there are the rare ones with changing colorimetries. Hence it wouldn't make sense to make ColorMatrix a default. It falls under the "use if needed" bracket, where it should be.

[drcl]

just thought it might be added as an option in the program.

Colormatrix/DGdecode can auto read the colorimetry and adjust accordingly.

Not all DVDs are interlaced but there are options in GKnot for deinterlacing.

[unskinnyboy]

Default - No (reasons already explained above).

Optional - Yes. You don't see it? I do:
http://img219.imageshack.us/img219/8903/colormatrixingkvb4.jpg

[drcl]

ummmmmm....no! I have never seen anything like that!

I must be using an outdated version again.... :o