recommend good ways to deinterlace the following clip

[Marin85]

Hi,

I have started reading up a bit on the topic about deinterlacing, blending and (inverse) telecine, it appears a bit overwhelming at the moment, but I have decided to practice with some samples from my DVD collection.

I have created a sample of a video I have where I am not sure what exactly is going on, so some help would be much appreciated. You can download the sample from here (http://ifile.it/h3qubfv).

It is a 25 fps PAL sample that is reported by mediainfo, DGdecode and Avisynth Info() as interlaced and top field first. However, when I did the AssumeTFF().SeparateFields() and AssumeBFF.SeparateFields() tests, they both seemed inconclusive in my eyes, meaning no obvious discrepancies in the motion except for the "doubling" of each frame (odd and even lines, respectively, due to SeparateFields(), I assume). Does it mean that the clip is actually fake-interlaced? If not, what is it then? And how can it be deinterlaced properly? Should I just feed it to QTGMC() and forget about all that? :o

[canuckerfan]

it says I have to register to the site. could you upload the file one another site? try sendspace...

[Marin85]

Oh, I am sorry, I was not aware they had changed their download policies like this. I have now re-uploaded the sample here (http://www.mediafire.com/?5u31a4795v3nrq5). (I have received some maintenance message from sendspace.)

[gyth]

Frame 1085
http://i.imgur.com/zvuTK.jpg
That is motion blur, or possibly blending, but it doesn't have the comb lines distinctive of interlacing.

DGindex can turn progressive into interlaced by honoring pulldown flags, but I thought that was only a problem with NTSC.

[2Bdecided]

I haven't downloaded it yet, but at a guess: The content itself is progressive. The MPEG encoding mode is interlaced. That's really common in PAL countries. It means nothing - just that the MPEG encoder was left in interlaced mode all the time.

You don't have to "do" anything with it. Just treat it as if it was progressive. Don't deinterlace it. It's not interlaced.

Cheers,
David.

[Marin85]

Ok, I see, thank you guys for the replies! In that case, if 25fps PAL does not exhibit combing artifacts and the TFF and BFF tests are neutral, is it then safe to assume that the clip is actually only 'fake-interlaced', i.e. progressive, but encoded as interlaced?

[Guest]

Yes, if the content is progressive upon inspection, then it is progressive.