Deinterlacing PAL Movie

[IJM]

Hi,

This is probably going to be a really dumb noob question. But having searched, I'm not entirely clear on this.

I have a PAL movie I've captured from VHS. I have it now on my harddrive as an Interlaced DV file. It looks like it's been converted to PAL by speeding the movie up by 4% from 24fps to 25fps. The two fields of each frame make up a complete "movie" frame with no interlacing artifacts what-so-ever.

My target format is full D1 PAL DVD. Now, normally I'd leave it interlaced, but, I'd like to deinterlace it so I can run noise reduction filters on each full frame rather than each field in turn.

There's lots of info out there on how to do IVTC or deinterlacing to remove interlace artifacts. But I'm unclear about how to simply convert it to progressive in this really simple and easy case.

Many thanks for any assistance.

Ian.

[Kika]

Looks like a progressive Video. There's absolutly no need to do anything else then filtering, because the Video isn't interlaced.

[cweb]

Is it actually possible to do video capturing in vhs
without the result being interlaced?

I thought it was always interlaced (at least for PAL which is what I use).

[Kika]

The signal is always interlaced. But on VHS can be stored progressive Movies too.

[IJM]

Originally posted by Kika
Looks like a progressive Video. There's absolutly no need to do anything else then filtering, because the Video isn't interlaced. Surely, there's a difference between a file having interlace artifacts (mouse teeth etc.) and the file actually being marked as interlaced? Although, my file doesn't exhibit any interlace artifacts, won't it still be flagged as being interlaced?

Originally posted by cweb
Is it actually possible to do video capturing in vhs
without the result being interlaced?

I thought it was always interlaced (at least for PAL which is what I use). Well, yes it is interlaced. But the PAL VHS version of this movie looks as though it was created from the original film source. The original film source normally runs at 24fps, so to transfer it to 25fps video, they've sped the movie up by 4%, so each frame of video is made from each frame of film. And both fields of each frame are made up from the same frame of film, hence there are no interlacing artifacts.

Ian.

[Si]

Interlacing should be used to describe the transmission system/display device but has ended up being used for a lot of things - one of which is "interlacing artifacts".

All video is interlaced e.g 2 pictures are interleaved together 50 times/sec and displayed 50 times/sec on a TV.

If the source is a video camera, then the 2 fields contain different pictures from 2 moments in time.

If you play the video back on a TV - everything looks OK.:)

If you play the video back on a PC - you see "interlacing artifacts".:(

Therefore you need to "deinterlace" them to improve the display.

If the source is actually a film, then the 2 fields contain different parts of the same picture at the same moment in time

If they are played back on a TV -they look fine.:)

If they are played back on a PC - they look fine.:)

No "deinterlacing" is necessary :)

Therefore in your case - no deinterlacing neeeded. :D
regards
Simon