Detecting interlaced video on DVD

[lilhobo]

I GOOGled and it says all DVD are interlaced (circa 2005, handbrakes forum).

but using dvdfab, most DVDs come out ok, but ocassionally the DVD looks all jitterry.

how can I detect when to use dvdfab's de-interlacer? which would have overhead i assume

[Lyle_JP]

I GOOGled and it says all DVD are interlaced (circa 2005, handbrakes forum).

but using dvdfab, most DVDs come out ok, but ocassionally the DVD looks all jitterry.

how can I detect when to use dvdfab's de-interlacer? which would have overhead i assume

DVD can have frames stored as progressive or interlaced or a combination of both, but the disc is always flagged to assume interlaced out (remember, progressive scan DVD players didn't even hit the market for a few years after DVD's introduction). If you are getting judder with DVD Fab's "deinterlacer", then it's probably just a "force film" mode like DGIndex has. In that case, you need to index honoring pull-down flags and feed your interlaced video through a real reverse telecine filter like TIVTC or Decomb. But to answer your question, there's no way to know beforehand. These are just things to try when DVD Fab fails.

Or of course your source could be pure video, in which case you need to do the same indexing but feed it to a real deinterlacer like TDeint or Yadif.

:search: Do a search. There are many dozens of threads on deinterlacing and reverse telecine.

[lilhobo]

huh i just need to know on which dvd i need to run a deinterlacer, to minimise overheads

[Guest]

See the FAQ at my website. You have to inspect the field pattern.

[Ghitulescu]

I GOOGled and it says all DVD are interlaced (circa 2005, handbrakes forum).

DVD can have frames stored as progressive or interlaced or a combination of both, but the disc is always flagged to assume interlaced out (remember, progressive scan DVD players didn't even hit the market for a few years after DVD's introduction).

Because there's neither a progressive PAL nor a progressive NTSC analog system. The so-called progressive DVD players perform the IVTC themselves (if possible, if not they simply BOB the source like the cheap line doublers) then send the signal to a compatible TV. Real progressive play was only possible using a real digital interface (HDMI) that was able to send 24p SDTV signals (neither PAL nor NTSC system limitations could apply) and a true 24p TV set.

However, I'm from PALland and maybe I'm mistaken about NTSC and progressive play. Because for PAL the whole thing is simpler, as no 24p is required.

[Lyle_JP]

Real progressive play was only possible using a real digital interface (HDMI) that was able to send 24p SDTV signals (neither PAL nor NTSC system limitations could apply) and a true 24p TV set.

However, I'm from PALland and maybe I'm mistaken about NTSC and progressive play. Because for PAL the whole thing is simpler, as no 24p is required.

Well, there are plenty of good progressive scan players that put out a "real" comb-free progressive signal in 480p over component, but as you point out merely being progressive scan does not get rid of the 3:2 judder entirely. Every other frame must still be held one field longer to achieve the proper frame-rate conversion.

[Guest]

he's referring to neuron2's website Oops, guess I shouldn't have banned him for his signature spam. :)

EDIT: Lifted the ban and deleted the sig spam.

[manono]

...but as you point out merely being progressive scan does not get rid of the 3:2 judder entirely. Every other frame must still be held one field longer to achieve the proper frame-rate conversion.
Unfortunately, it doesn't get rid of the judder at all. When using progressive scan on film sources each frame is played for the same length, one-sixtieth of a second, and in the same 3-2-3-2-3-2 pattern.

[lilhobo]

do these de-interlacer introduce artifacts, or can they introduce? or are they robust enough nowadays

[lilhobo]

See the FAQ at my website. You have to inspect the field pattern.

where s this site anyways lol what tools do i use?

[rack04]

where s this site anyways lol what tools do i use?

http://neuron2.net/faq.html#analysis

You can post a unprocessed source for someone to examine.

[lilhobo]

http://neuron2.net/faq.html#analysis

You can post a unprocessed source for someone to examine.

erhmm how do i chop up a vob?

[Guest]

DGSplit is one option.

Start using search for simple questions like this or a mod may get rule 1 trigger happy.

[lilhobo]

A simpler program like mediainfo is a better way ;)

which is a solution that i have now provided for others

[rack04]

A simpler program like mediainfo is a better way ;)

which is a solution that i have now provided for others

Mediainfo will not tell you what the field sequence is. Why not post a source?

[lilhobo]

Mediainfo will not tell you what the field sequence is. Why not post a source?

what do you means by posting a source? you want a 1gb vob??

mediainfo does give field sequence on vob's

but it lists dvd with both interlaced and progressive video.

Most dvds seem to be all interlaced, but some recent dvd have

1. vts_01_1 as interlaced,

2. whilst the rest of the vob's are progressive.


How do i deal with these DVDs? do i turn on de-interlacer?

eg, unforgiven, latest batman etc

[Guest]

what do you means by posting a source? you want a 1gb vob?? You asked above about how to chop a VOB. I told you to use DGSplit. So split off a 50MB chunk and upload it to mediafire.com. Then post the link here. If you think the VOBs are different, then post a sample from each.

mediainfo does give field sequence on vob's You've been told that you cannot rely on mediainfo and you've been given a link to a reliable method. If you choose to ignore that, then probably people will stop helping you.

[lilhobo]

i have a dvd collection of 100, small yes, but i cannot chop it up and ask about everyone of them !

[lilhobo]

someone go thru the steps for me then


http://neuron2.net/faq.html#analysis
How do I figure out the nature of my source video?

what does all that mean?

[Guest]

Post a sample for one case. Then learn from that so you can apply it to your other videos.

If you do not understand the material at the link, then describe what part you are having trouble with, so that we can clarify it for you.

I hope this thread is not one massive troll.