Hybrid DVD Video title flagged as progressive

[abysas]

I tried to backup Depeche Mode "Music For The Masses" PAL DVD9. It is a music DVD, but it contains also one documentary title 37 min. long. So the thing is though this title is a hybrid video, i.e., some parts are interlaced (contains combing artefacts) and rest is clearly progressive, but the whole video in this title is flagged as progressive. I wander whether I may have problems in future watching this DVD on progressive displays such as LCD or Plasma TV. I don't have one to check. Should I use Restream to flag it as interlaced, or maybe it is not necessary? Any suggestions? Thanks in advance and sorry for my English.

[setarip_old]

Hi!

Why be concerned about that now? Should it prove necessary, you can always make another, different-format version from your original DVD in the future...

[abysas]

Well, maybe you're right. I'm just curious what effect it may have and does it make sense to do anything now, when I making backup. I checked with BitrateViewer and it showed scan type type was Zigzag. I have only vague understanding of color coding (that chroma stuff) differences in progressive and interlaced video, but it seems that this title (or at least its interlaced part) is complete mess, isn't it?

[manono]

Hi-

I wander whether I may have problems in future watching this DVD on progressive displays such as LCD or Plasma TV.

Maybe, maybe not. It depends on how good your player is. A decent player will ignore the flagging and go by the cadence to determine how to handle it. That is, if parts are really interlaced, even though the entire thing is flagged as progressive, it'll deinterlace the interlaced parts. A crummy player (in the majority at the moment) will read the progressive flags, do nothing (sort of), and when viewed on a progressive display, it'll be full of interlacing.

If you're not sure how to tell pure interlace from hard telecine, and if you're thinking of reencoding the DVD, you might upload a small sample of the interlaced section for us to have a look

[abysas]

manono,

thank you for your valuable response. Using VobBlanker I could reduce the size of the DVD down to 4.7GB without need of recompressing this documentary title. Huge amount of space was wasting in music titles where only album picture was shown during play but this picture consumed lots of space (~3 GB!!). So using VobBlanker I reduced it to still and now it easily fits to DVD5 without any recompression. Interlaced parts seem to be taken from old video footage and are purely interlaced:

http://www.mediafire.com/?6ytlwy42g2f

I read a little about that chroma upsampling stuff and now I understand a little bit more than before posting this thread :).
At http://avisynth.org/index.php?page=Sampling I've read about difference in interlaced and progressive YV12 color format and it appears that if I set interlaced flag I will mess color information, because on progressive video UV is shared between neighboring lines and on interlaced video UV is shared with next to neighboring line, isn't it? So it seem I'd better leave it as is.

[manono]

I only now noticed you're from Lithuania, so you can ignore my previous comment about telling pure interlace from hard telecine (something found in NTSC DVDs).

I'm far from a color expert, but I think you're right in thinking the best thing is to leave it alone.

[abysas]

Thank you manono for your assistance. Your explanation about how standalones deal with interlaced material is very helpful. I didn't know that before. It indeed will help me in choosing to buy good DVD player :) Thank you.