Is There a Stronger Deinterlacer than Decomb?

kaitoujuliet · Post by **kaitoujuliet** » Fri Dec 13, 2002 9:36 am

McKeed, thanks for the tip. That sucks, though. Do you know whether all AnimEigo discs have the same problem? If so (and if we can't find a fix for it), I'm going to have to re-think several projects I had in mind.

I tried playing with the Decimate numbers in the avisynth script, but all I managed to do was change the number of bad frames in between the good ones. With Decimate (5), I got 3 bad frames to each good one; with some other numbers, I managed to get 1-2 bad frames to each good one. Still doesn't look great, though.

You'd think something as powerful as avisynth could handle footage that's mastered in a popular format, though.

Juliet

Dannywilson · Post by **Dannywilson** » Fri Dec 13, 2002 11:07 am

I just played around with FLCL disc 1 with decimate and telecide, and it worked awesome. I dont know what I did right, but it apparently worked.

mckeed · Post by **mckeed** » Fri Dec 13, 2002 1:31 pm

but a side note......its not bad to keep things interlaced. For Ah! My Goddess, I could tell it was originally a flm source as most of the frames were ok. But here is something to think about. Interlaced stuff generally goes look good on a TV. Since I have a TV out on my rt2500, I can see the difference between the computer monitor and a TV. Most cons make a master tape anyway for their presentation.....except AWA, cause they got mad tech talent and got their shit togeather. But since you are recording to a tape and sending it in, its probally BETTER to have it interlaced as it will interlace it anyway when you output to tape. But since most stuff is done for online distro, you can run an area based de-interlacer through it a few times and get rid of the stuff that looks bad. The Ah! My Goddess footage will clean up nicely with that filter so I woulldn't worry too much about that. Just something to think about. At least you know exactly what its going to look like when you export it as if its interlaced, nothing needs to be changed anyway. I could only tell the interlaced parts in certain segments of the video and I de-interlaced those parts by hand and it looked verry good. Pain in the ass? yes. But the final output looks awsome so it was worth it.

kaitoujuliet · Post by **kaitoujuliet** » Fri Dec 13, 2002 2:52 pm

mckeed wrote:but a side note......its not bad to keep things interlaced. For Ah! My Goddess, I could tell it was originally a flm source as most of the frames were ok.

In what I'm getting, most of the frames are not okay. In the particular segment that I'd really like to use, it's about three bad-looking frames for each good one.

But since you are recording to a tape and sending it in, its probally BETTER to have it interlaced as it will interlace it anyway when you output to tape.

I don't have a video out card, so I won't be recording to tape.

But since most stuff is done for online distro, you can run an area based de-interlacer through it a few times and get rid of the stuff that looks bad. The Ah! My Goddess footage will clean up nicely with that filter so I woulldn't worry too much about that.

OK, time for me to display my ignorance

--what's an area based de-interlacer, where can I find one, and is there a guide somewhere on how to use one?

Also, didn't you say before that you never did manage to clean up the Ah My Goddess footage, and the only way to get around it was by careful cutting? Unfortunately, I've got ghosts smack in the middle of a panning shot which I'd like to use, so I can't really cut out the ghosted section.

At least you know exactly what its going to look like when you export it as if its interlaced, nothing needs to be changed anyway.

...You mean nothing needs to be changed for VHS distribution, right?

I could only tell the interlaced parts in certain segments of the video and I de-interlaced those parts by hand and it looked verry good. Pain in the ass? yes. But the final output looks awsome so it was worth it.

More ignorance: Where can I find information on how to do a manual deinterlace?

Juliet

mckeed · Post by **mckeed** » Fri Dec 13, 2002 3:11 pm

yes....there were some bad spots. An area based de-interlacer works as follows... First you can find it online if you put that in google. what you do is just deal with the interlacing for now....export your huffy.....and pull in into virtualdub. Then you put the area based deinterlacer in virtualdub in the filters section and run it on full processing mode.

An area based deinterlacer works as follows. It goes through looking at all the frames.....when it sees interlacing, it only cleans up the part of the frame that looks bad. I'm sure you noticed that interlacing only effects the moving part of the frame. So it keeps what looks find and just changes the part of the frame that sucks.

Manual de-interlacing. I don't know if thats the right word for it but that is what i call it. Normally a interlaced frame will have a decent frame before or after it. What i was doing was exporting either the image before or after the bad frame and inserting that in the bad frame's spot. But it seems your part has a bunch in a row....so i can't seem to help you there. I was even brining in images into photoshop and cutting and pasting the good parts togeather for a better looking frame. Make sure you are working in 30fps though. Also...some software dvd players on the computer automatically de-interlace when you take image captures. You could try putting it into powerDVD or something and finding tht whole sequence you are looking for and see if it can clean it up on export.....that would really solve your problem......i think....But since it is mastered in NTSC its probally interlaced on the DVD to begin with.

Ashyukun · Post by **Ashyukun** » Fri Dec 13, 2002 3:12 pm

kaitoujuliet wrote:
I don't have a video out card, so I won't be recording to tape.

Actually, I think it's also fairly common these days to burn off the video as a VCD or SVCD and record it to tape from a DVD player (or just distribute it as VCD/SVCD). This is what I've found I like best, as SVCD standard quality is generally higher than that of VHS tape.

mckeed · Post by **mckeed** » Fri Dec 13, 2002 3:22 pm

some cons require you send a tape...so SVCD isn't allways an option....though most take digital submission nowadays, but in that case i send a 6mbit mpeg-2 on CD-R or master a DVD-R.

mckeed · Post by **mckeed** » Fri Dec 13, 2002 3:36 pm

also forgot to mention this. If you take you video to CIT resolution.....half size. As long as you cut half the vertical scanlines, you effectively eliminate interlacing as there will cease to be two fields as it will throw out half the scanlines to achieve the correct size. Sooooo....since most online distro's are at a half resolution size.....it may end up being a non-issue anyway. Not that is doen't help to remove it ahead of time. Also.....try not to slow down or speed up clips if possible as even if you drop to CIT, it may look odd as it will use the even odd fileds to interpolate unless you tell premire to de-interlace when you slow it down.

RadicalEd0 · Post by **RadicalEd0** » Fri Dec 13, 2002 4:28 pm

Just a note, if you're recording by dvd/svcd to tape there's nothing to gain but some to lose by leaving it interlaced. Since the DVD player will auto-telecine on playback, the output will inevitably be interlaced, but if you have the dvd player auto-tc it then at least you're good for web distro and are saving bits using 23.976 fps than pseudo-29.97