DV capture, but no interlacing artifacts !

[ariga]

I capture analog video from TV with TRV-355E camcorder. When playing the DV avi in VDub, I noticed two clips that did not exhibit any interlacing artifacts. It appeared as though they had already been deinterlaced. All the captures are from the same TV channel. How is it possible ?

More importantly, what deinterlacing (avisynth) filters should I use on such clips?

[Jalavera]

Not always TV is really interlaced. Sometimes films are false interlaced. Look at 100fps.com

[jggimi]

Moving to DV forum.

[ariga]

Does that mean if I capture progressive analog content with my camcorder, the DV avi will also be progressive ? I am confused since my camcorder only shoots interlaced. :confused:

[Kika]

You are right: If the source is progressive, it will stay progressive. Interlaced only means - in this case -, that a picture will be splitted into two fields. But both fields are from the same picture and as a result, you have a progressive movie.

[ariga]

Thanks a lot Kika. I thought interlaced video only was field based. Well, now it saves me some time since I don't need to run any deinterlacing filters on it.

[bb]

But you may wish to use Telecide (either the AviSynth or the VirtualDub version) in case of field swaps occuring now and then.

bb

[ariga]

Telecide would be for NTSC DV only I guess ?

[Guest]

Telecide would be for NTSC DV only I guess ? No. Telecide by itself is a general field matcher. It doesn't care about frame size or frame rate.

You are probably thinking of Telecide followed by Decimate to do IVTC.

[ariga]

Well, many websites say Telecide = IVTC. :(
My knowledge of fields/frames/interlacing is poor. Will read up a little and post more queries (here or on the newbies forum. ?)

[ariga]

Well, I read a little and had a look at Telecide from Decomb package. But I am not very good at determining whether or not to use Telecide. SeparateFields and AssumeTFF/AssumeBFF both looked same. :stupid: Uploading a few frames from the capture here (http://rapidshare.de/files/8321258/dv_sample.avi.html). Someone pls let me know how to process it.

[Guest]

>SeparateFields and AssumeTFF/AssumeBFF both looked same.

That is what one would expect with progressive content.

The clip you uploaded is progressive. There's no need to IVTC or deinterlace it.

If you need Telecide() to protect against field phase changes, use BFF for DV.

[ariga]

SeparateFields and AssumeTFF/AssumeBFF both looked same.
That is what one would expect with progressive content.
NOW I know :thanks:
If you need Telecide() to protect against field phase changes, use BFF for DV.
Whatever that means. But I'll take your word for it ;)
"field phase" <=> "field dominance" (Avisynth terminology) ?

[Guest]

Try your movie without Telecide. Do you ever see combing? If not, you don't need Telecide(). If you do see combing add Telecide configured for BFF.