by Willen » Thu Aug 03, 2006 9:20 pm
You'll need to look at the source material frame by frame (or field by field) to really know for sure.
For Pure Interlaced material, and Telecined/Pulldown Material, you can look at the individual frames and count duplicate fields/frames.
Pure Interlaced Material is rare for anime (except for mainly CGI portions; see Hybrid Sources), but the telltale sign is unique individual fields (as opposed to frames).
Telecined/Pulldown Material is easy to see, it will have a 2-3-2-3 pattern. Since this is a result of converting film to video, it is mainly feature films that have a 24fps framerate that utilize this fully. But since anime (especially older hand-drawn series) are generally done with cel animation, even at the lower framrates used for TV, most anime respond well to IVTC (inverse telecine).
Hybrid Sources are appearing more and more frequently nowadays. The majority of the episode is animated with cels (Telecine/Pulldown) and certain parts are CGI (Pure Interlaced). Again, you will have to look at the footage to determine this. A giveaway is a scene of unusually fluid movement (especially if it looks like it was computer animated).
Full Field Blended Sources are usually a found on PAL/SECAM DVDs that are made from 29.97fps and converted to 25fps. If you aren't using PAL/SECAM DVDs, I wouldn't worry about this. The key is detecting this type of footage is that almost all the frames have blending (2 or more fields/frames mixed together).
Partial Field Blended Sources I've found are more prevalent in older anime where the telecine method blended fields together to achieve a smoother look to movement. EADFAG has some images that show examples of what this type of material looks like. Again, you need to look at the fooage to figure out if it is PFBS.
What I usually do is try to use Decomb or TIVTC first, look at the footage and see if there is still significant interlacing. If so, then I switch to a plain deinterlacer like KernelDeint or TDeint.
Having trouble playing back videos? I recommend:
