interlace flicker? drivin me crazy!!!!!

[zike]

How the hell do you get rid of the annoying flicker (which i assume is interlace flicker) when playing back captured analog video. It appears on Comp monitor and on tv out playback. Most obvious if something moves across the screen at any speed.. Making me crazy and need some good ole advice on this.
Capturing using Nvidia ti200 (is this the problem)?

[willy_annand]

Give www.lukesvideo.com a read, Luke fully explains interlacing there.

[mgh]

Encode to mpg ( 1 or 2) using TMPGEnc -on the settings video tab set non-interlace-advanced tab -select Deinterlace-try methods available one by one to see which suits youand your videos the best-I like Double Field

[Cornucopia]

Do this real easy test:

Capture a short example video, and then without doing anything, play it out to your TV (not Computer monitor). Should look fine. If not, your capture setup is messed up.
Then encode that same file, without de-interlacing or IVTC, to MPEG2 (file or SVCD or DVD) and play out to TV. If it's messed up now, you have somehow SWAPPED your fields. Check your settings to see where the swap might have occured, or do an additional swap of the fields and then play out. Does it look better now?

HTH,
Scott

[zike]

Thanks for the responses. If I capture small vid and play directly to tv-out the problem is there. What do I have to do to my capture setup to help. I am capturing 352 x 576 to get both fields, no dropped frames

[Amontillado]

it probably still is just interlacing you notice.
The test Cornucopia proposed only works if you're tv-out is good enough. Unfortunatly it seem to be impossible to display a interlaced PAL file on a PAL tv with any nvidia based card (regardless of the videochip used).

I tested about 10 different graphics cards and the only ones that properly display a interlaced image are the matrox cards (de-interlaced is fine on most other cards).
I'm not sure if this only a problem in PAL coutry's but for some reason they don't seem to properly send a proper PAL signal. I tried different field orders, adjusting monitor/dispal resolution to 768/720*576, different drivers, of course TV-tool, but it just won't work. A couple of friends did tried the same with the same bad results.

A better test to see if it really is interlacing you see is to burn a PAL interlaced file to svcd (or dvd if you have a dvd writer). and play it back on a standalone dvd player.

[bunyip]

Interlacing drives me crazy too.

I'm in a PAL country and capture in both 704x576 and 352x576 and without exception, the only way to get a steady clean result to any device (PC or standalone to TV) is to de-interlace during encoding. Without deinterlacing you get both interlaced lines and a very, very jerky playback - so now I always de-int.

I have found that the best deinterlacers for PAL which don't soften or distort the image are:
• For TMPGenc - its internal deint using 'Even Field' only.
• For VirtualDub - of all the deint filters written for VDub I have found the best to be the one included inside Jim Leonard's 'White Balance' filter (I only use the deint option).
• For Avisynth the best is 'Smart Deinterlace' with a low setting of 1,1.

I keep reading in this forum, the advice by so many to leave interlacing on - it just doesn't work for PAL - or at least my flavour of PAL.

[Amontillado]

Bunyip,

If you really want to watch a interlaced file on a tv using the pc's tv-out you should get a matrox 450/550 (newer models are probably fine as well but i've had no chance to test them yet).
Using matrox's dvdmax option you can play any interlaced mpeg perfectly.
(of course you will still need to de-interlace if you plan on watching on your pc monitor, but with all mpeg decoders you can do this while DEcoding so no need do it while ENcoding).

I have no idea why the other manucfacturars haven't got this working, and also wonder if this is only a PAL problem ?
Can you display a NTSC interlaced file properly using the tv out of a e.g. nvidia card ?

[bunyip]

The issue is not with "PC to TV" but with "PC alone" or Standalone DVD player to TV.

I do have in fact, a Matrox G400 and it plays back anything it captures OK but once the capture is encoded to anything that bypasses the card for playback (ie non MJPEG or non YUY2) the interlacing is out of control.

So creating an SVCD or DVD will always have problems unless I de-interlace while encoding to MPEG.

[Amontillado]

sorry, misread your post i guess.

I do have in fact, a Matrox G400 and it plays back anything it captures OK but once the capture is encoded to anything that bypasses the card for playback (ie non MJPEG or non YUY2) the interlacing is out of control.
So creating an SVCD or DVD will always have problems unless I de-interlace while encoding to MPEG.

But what you experience is not a PAL related problem i think. Many people here can capture interlaced pal, burn it to svcd or dvd and let it play back fine on a standalone dvd (at least I can and I used a Medion bt878 based card, a Terratec Cinergy 400 and a hauppauge pvr 250). Seems more like a codec problem, maybe field order wrong, or something like that.