what does the interlaced checkbox do?

[Mike456]

Hi!

What happens if the "interlacing" checkbox is activated? An interlaced testvideo is neither smaller nor deinterlaced during playback!?

[Koepi]

As described if you use the search button(forum rule 1):

- it enables interlaced encode mode
- it helps (badly) interlaced movies quite a bit

...

It's not meant to do any pre-processing which doesn't belong into a codec, like deinterlacing.

Maybe your clip isn't really interlaced, in that case you don't gain anything.

Try a TV capture at full resolution (no resize!) and you'll see the difference.

Koepi

[Mike456]

I've searched for interla* in this forum, but there were so many results that I havn't found the information. The source was an interlaced DVD. The mpeg encoder from the publisher made in high motion scenes some artefacts. Because of that some scenes are not "really" interlaced.

[Koepi]

Hm, while most mpeg2 streams indicate they#re interlaced, they aren't content-wise. (I.e. dvd2avi claims for nearly every PAL dvd that they're interlaced, but decoding them without deinterlacing shows no interlacing artefacts. Like some TV captures: even if it's PAL TV, you sometimes don't need to deinterlace as the material is progressive! Strange, but the world turns out this way ;) )

Maybe that's why you don't see a difference.

Regards
Koepi

[cweb]

What about mpeg2 satellite captures using the Hauppauge? Are those
really interlaced? It seems to me that they are and normally I deinterlace them.

What is your opinion on these?

Originally posted by Koepi
Hm, while most mpeg2 streams indicate they#re interlaced, they aren't content-wise. (I.e. dvd2avi claims for nearly every PAL dvd that they're interlaced, but decoding them without deinterlacing shows no interlacing artefacts. Like some TV captures: even if it's PAL TV, you sometimes don't need to deinterlace as the material is progressive! Strange, but the world turns out this way ;) )

Maybe that's why you don't see a difference.

Regards
Koepi

[Zhnujm]

this is for PAL only, and its the same for dvb and analog captures.

if you capture a movie, wich was once shown in cinema its 99% NOT interlaced. maybe the field order is wrong, but its not interlaced. only thing you need then (if theres something wrong with the fields) is the Telecide filter.

if its a tv-show or a movie/serie produced for tv its most times interlaced, but not every time.

the easiest way to check this is to look at the movie.
if its interlaced you should see this in fast moving scenes, if theres a problem with the fields you should see this even when no motion is there.

[Enrico Ng]

So if I encode a TV capture using the interlaced check box, does this mean that when I play the video, it will de-interlace it?
I haven't noticed this.
It still looks very interlaced, I must run it through a (slow) deinterlace filter to fix it.
If I must do this, then I don't see what difference it makes.
Performance seems to be the same.

[Teegedeck]

No, it WON'T deinterlace anything! The interlaced mode is there for people that want to keep the video interlaced but want to encode it correctly. You can imagine that there has to be a special mode for motion-estimation to work correctly with an interlaced picture. Don't ask me how it works, search for -h's posts about it as he has programmed that feature.

And besides, Koepi already answered your questions! Don't get off to a lazy start here, reading what others wrote might actually help you to understand some things. You're relatively new around here, please be a bit more attentive, we're not on DivX.com here...

[Enrico Ng]

oh, I missed the word "decoding"
I thought he said that when ENcoding, it does not deinterlace and nothing about DEcoding.

[symonjfox]

Originally posted by cweb
What about mpeg2 satellite captures using the Hauppauge? Are those
really interlaced? It seems to me that they are and normally I deinterlace them.

What is your opinion on these?
Hi, I have your own matter and I do this:
1- The stream is always marked as INTERLACED because satellite trasmissions are designed for TV (interlaced). But if you encode a progressive stuff into an interlaced mpeg2/4 there won't be any problem. If you encode an interlaced content into progressive mpeg2/4 there's a lot of wasted space (lot of bytes spent just for interlacing artifacts).
2- First create your own AVS file and load it into vdub. Scroll somewhere and check if there are interlacing artifacts. If yes, be sure to add mpeg2source("d:\video.d2v",ipp=true) so avisynth will work a lot better.
3- Now you can choose if deinterlace or keep interlaced. I always KEEP it interlaced, because it will give me the best avaiable quality during playback (on interlaced monitor, off course).
4- The best would be using also ANAMORPHIC encoding (so NO resize form DVB captures) but I'm waiting for an implementation
@Enrico
For playing back interlaced contest in PC monitors, you can use FFDSHOW and enable the deinterlacing filter you like most. Xvid Dshow filter won't deinterlace anything.