AutoGK simple question

[KnightAzul]

Hi,

Is there any way of encoding an interlaced AVI DV source to interlaced DivX? I understand that the latest versions of DivX support interlace encoding. I have the DivX 5.2 codec installed.

AutoGK seems to force deinterlacing during the encoding process.

Thanks for any help!
KnightAzul

[len0x]

no, but why? :)

[CWR03]

Agreed, "why?" AutoGK is forcing deinterlacing because it's detecting that it needs to. If you don't deinterlace when needed, your file will have frames that will look like a portrait that had a comb dragged through it while the paint was still wet.

Have you already encoded a file where you were dissatisfied with the results? If so, post the logfile from that encode along with either some screenshots of the file or a small sample of a section that looks the worst.

[jggimi]

There *is* a valid reason for retaining interlacing -- when playing back on an interlaced display.

The odd and even fields are each compressed as separate video streams. I've only done this with MPEG-2, but never with .avi MPEG-4s, so I have no specific b/p*f or quantizer advice.

[CWR03]

There *is* a valid reason for retaining interlacing -- when playing back on an interlaced display.
Interesting, I didn't know there was such a thing. What is an "interlaced display?" I'd most definitely want to avoid buying one by mistake, or all the years of work I've done deinterlacing files will have been wasted.

[KnightAzul]

no, but why? :)

Here's the deal ...

I have interlaced PAL DV AVI material, which originated from a digitial video camera and was edited with VideoStudio, and that I want to convert to DivX. I used AutoGK which deinterlaced the DV AVI and encoded to DivX. The quality of the final result was excellent!

However, on playback there is a little jerkiness on my CRT and PC TFT screen, which I attributed to the 25 frames per second not being enough to give smooth motions. In addition, there seems to be no perfect way to create 25 full frames from 50 fields so you will always end up with some fickering artifacts. Keeping the interlacing preserves the fluidity of the motion as far as I understand.

I have read in numerous posts that the latest version of DivX and Xvid support interlace encoding wihch would probably solve my problem on the jerkiness?

Looking forward to the not too distance future I'm sure that I'll be investing in a large LCD TV for my lounge and dumping the CRT. Can LCD TVs accept interlaced input and how do they perform? The question here is that I also need to encode to meet my future requirements too i.e. decent playback on a LCD TV too.

KnightAzul

[len0x]

AVI container has no concept of "interlacing", so usual software/hardware players would not restore progressive material on the fly and you will be unable to watch it properly (DShow filter like ffdshow may be able to do that, but I doubt that hardware players can).

[jggimi]

What is an "interlaced display?"A television with a cathode ray tube. See http://www.doom9.org/video-basics.htm.AVI container has no concept of "interlacing"...As I mentioned, I've only done this with SVCDs and DVDs. MPEG-2, designed for standalone players connected to SDTVs.

I've never done this with AVI, my MPEG-4 capable player is progressive scan, and my television is progressive as well.