quality difference?

Synthangel · Post by **Synthangel** » Mon Dec 30, 2002 7:53 pm

I just finished up my first video, and I noticed something strange about it. I used ErMac's method of importing my d2v files into premiere, set my virtual memory to 4 gigs, spent a bunch of laggy hours editing, and finally, I was finished. I exported it into 720x480, huffyuv format. I find it strange, however, that my AMV quality looks alot worse than my DVD at 720x480. When I brought it down to 352x240, it looked great, but it looks horrible at the original resolution. The edges are jagged, straight lines aren't straight, but lots of little lines connected, and when I have scenes with almost no movement in the background, you can see the background like, shift constantly. I thought huffyuv was supposed to be lossless. Well, any help on this topic would be greatly appreciated. Thanks!

Btw, I don't think it's my system. I've got a 1.4 Ghz T-bird, with 512 PC2100 RAM and a Geforce2 Pro. I dunno whats wrong.

klinky · Post by **klinky** » Mon Dec 30, 2002 8:47 pm

This goes in General Video...

What source footage are you using?

Did you IVTC?

What did you export your video as from Premiere(sounds like you used HuffYUV).

Evangelion had alot of crappy cel shifting going on because Gainax had their heads up their asses. Also they did a poor job telecining.

Of course you may not be using Eva :\

~klinky

Synthangel · Post by **Synthangel** » Mon Dec 30, 2002 8:52 pm

Source footage, I ripped my vob's from my 8 DVD collector's edition Vision of Escaflowne DVD's. Err...IVTC is inverse telecine right? No, I didn't do that, and I'm not quite sure how to do it effectively, and I'm not sure exactly how it works. I used Vision of Escaflowne, as said above, and I exported from Premiere to huffyuv. Oh yeah, I'll put my next newb plea for help in General Video =P Thanks for the tip.

klinky · Post by **klinky** » Mon Dec 30, 2002 9:08 pm

Well if you don't do IVTC you're going to end up with scenes that look kind of like this:

You can do good IVTC using decomb, by just adding two simple lines to your avs script. So long as you have the AMVapp Pack installed or have decomb installed already.

For NTSC(R1,R2 footage)
telecide(guide=1)
decimate(cycle=5)

Place that right after your mpeg2source("d2vfilename.d2v") line.

The problem is that your already slow AVS becomes even slower now. So your best option is to use method three in the guides which requires more space. Also you have the problem of your video getting converted to NTSC FILM rate of 23.976 & Premiere only supports 23.98 or 24fps timebases(because it sucks).

So you must speed up your audio and video and edit on a 24fps timebase :\ Then you can export @ 24fps, slow back down to 23.976. If you so NEED to. Though that's not really needed unless you want to put it on a DVD or you must match your video with some sort of spec.

Another thing :O

If you slow clips down in Premiere, it will try to automatically de-interlace them. If you slowed any clips down then right click on them, goto Video Options|Field Options, make sure de-interlace when speed is under %100 us turned off. Premiere has a poor exscuse for a de-interlacer and it gives it a blurry shimmering effect.

Also since you reduced the resolution,the effects are diminished since you're sampling down in size. You may not notice them as much.

~klinky

RadicalEd0 · Post by **RadicalEd0** » Mon Dec 30, 2002 9:08 pm

haha :p
those lines are called interlacing and unless you know how to deal with them properly everything you do is going to look like shit :\

RadicalEd0 · Post by **RadicalEd0** » Mon Dec 30, 2002 9:10 pm

DAMNIT KLINKY DONT POST AT THE SAME TIME AS ME WITH A MORE INFORMATIVE POST EVER AGAIN EVER
:P

klinky · Post by **klinky** » Mon Dec 30, 2002 9:11 pm

Oh yes and as for what you can do, you can try a area-based de-interlacer to remove unwanted lines. It's too late to do a IVTC on the footage. Well you COULD try sending your file through AVISynth with decomb, but I don't really like the idea of that method.

:\

~klinky

Synthangel · Post by **Synthangel** » Mon Dec 30, 2002 9:35 pm

Well, I've still got all the vob's on my HD. If I just added the lines in, wouldn't it just change what I've already got? All the cuts and stuff are done, so can't I just re-export and have a nice ending copy? Oh yeah, I slowed down some frames. That's probably why premiere's screwing my vid over. Thanks!

Org Profile · Post by **Vlad G Pohnert** » Mon Dec 30, 2002 10:22 pm

Ok, so here is an interesting question to all you teches out there just to keep things interesting:

Say you are ripping footage from a DVD and are converting it from the VOB files, do you interlace it right there before using it to edit?

Now lets add in how editing is done. It is using a native software codex or is is using a codex native to a hardware editing card?

Say you use a DV500, would you convert the footage to it's native DV interlaced codex since the clip will then play in real time, and then look at de-interlacing clips as required using whatever method or do you de-interlace everything first.... How about if you use no hardware card?

Then add in the frame rate ingrediant, 24 fps vs 30? which is prefered??

Also lets throw in having to re-interlace it if required if it is to be shown in NTSC...

I personally use a Matrox RT2500 card for editing and have developed a prefered method I used for the whole process depending of course what I do (straight editing vs clip manipualtion, etc), but I would like to hear what others.

Vlad

Org Profile · Post by **Vlad G Pohnert** » Mon Dec 30, 2002 10:26 pm

BTW, I'm not really asking about how to do it (A tech guide), but people ideology and mythology since It there are always a hundred different "right" variations to anything

Vlad