Make a table of Stat-values and corresponding actions

[ukb007]

Hello.

It's time you PROs (Hi, manono, jggimi, hakko504) made a two-column table of Source Statistics on the left column, and your suggested action on the right. For instance: what do I do when the stat-values are the following ?

1. Frame Rate 29.970, Video Type NTSC, Frame Type Interlaced

2. Frame Rate 29.970, Video Type NTSC, Frame Type Progressive

3. Frame Rate 29.970, Video Type Film 70%, Frame Type Interlaced

4. Frame Rate 29.970, Video Type Film 98%, Frame Type Interlaced

5. Frame Rate 29.970, Video Type Film 70%, Frame Type Progressive

6. Frame Rate 29.970, Video Type Film 98%, Frame Type Progressive

There are theoretically other combinations, too. (Some combinations may, of course, be absurd and can't happen, like:

7. Frame Rate 25.000, Video Type NTSC, Frame Type Interlaced

etc. But a table may contain these and the corresponding right column may explain why they are absurd.

Regards.

[jggimi]

I'm no pro, but here's what I do when going to MPEG-4 for PC playback:

I start with force film turned off, and use the [ key to start my project beyond the distribution and production leaders, which might not have Telecining flags. I also Save Project (f4) rather than Preview (f5) because it's much faster. I may do a Preview of a small section first, just to check. But in general, I do save a test project at the beginning.

Type 2 - I don't think I've ever seen. Film/Progressive, yes. NTSC/Progressive, no. It's possible, of course, with progressive cameras. But I haven't dealt with all that much digital video camera content. If I ever get a Type 2 I'd just leave it at 29.97.

Types 4 and 6 I would treat exactly the same: I run ParseD2V against a non force-filmed project, to see if the 98% was caused by cuts after telecining. If each of the pattern breaks is at a scene change, I force film, otherwise, I use DeComb's IVTC. However, I usually use Telecide with post-process deinterlacing turned off.

Types 1, 3 and 5 I treat very similarly to Types 4 and 6. I will check a scene with movement, to see if it has Telecining patterns. If not, I merely deinterlace. If it does, I still run ParseD2V but now I'm looking for hybrid scenes. If there aren't any, then I use IVTC. If there are, I leave it 29.97.

I've never dealt with Type 7, unless it was a sample clip from someone on the forum dealing with a problem.

There are some new techniques for analyzing and managing hybrid content from within AviSynth, from len0x's work with AutoGK. But, since I haven't yet played with AutoGK, I haven't looked into them. Manono has been working on AutoGK documentation, and is far more familiar with what those might be.

[hakko504]

In a way you're oversimplifying things by making the table that way:
Type 1 may be progressive and it may be telecined, there is no way of knowing without looking at the video
Type 2, unusual, but I expect there should be some stuff that have this combination
Type 3&5 are in fact the same, but one clip happened to be encoded with the last frame in progressive mode and the other in interlaced.
Type 4&6, same thing here it's just that this one can safely be IVTC'd (or even Force Film'ed)

What it comes down to is this: If DVD2AVI say's interlaced or switches between FILM and NTSC at any time in the clip you have to check the clip frame by frame if you want to make the best of it. There is no general piece of advice that is right every time for a given statistics screen.

[ukb007]

Thanks, jggimi and hakko504.

I am trying to assimilate the information you gave. As hakko504 said, true, it's an oversimplification. This oversimplification may be the last straw for a sinking soul.

Meanwhile, The link for ParseD2V.zip in your famous IVTC article does not work. And I can't find the software by searching with several search engines: they all point to your article.

1. Gimme a good link.
2. Please revise your article to include new knowledge or, especially, new methods that must have come out after your last revision. I expect many lost souls bank on your article as a distant flare.

[hakko504]

Well, I read the DVD2AVI FAQ (http://forum.doom9.org/showthread.php?s=&threadid=59272) and found a link to ParseD2V (http://neuron2.net/tools/ParseD2V.zip) which works.

[ukb007]

Yes, thank you, hakko504, and thank God.

Regards.