DGDecode postprocessing for FILM@29.97

[izx]

I've recently begun backing up a number of my old (B&W) movie DVDs. DGIndex reports FILM at percentages between 98-99.5%. While this sounds good enough, I did find a couple of stray frames with combing artifacts using DGDecodes 23.976 pulldown. So I've had DGDecode output a 29.97 fps stream, and use Telecide with guide=1 and no postprocessing, and this eliminates the problem.

However, I'd like to keep using DGDecode's postprocessing (deblocking/deringing). The question is do I turn iPP on for the 29.97 stream, since two of the frames are interlaced, or do I leave it off?

[Cyberia]

if you are using field operation=NONE, then all your frames are interlaced and you should set Ipp=True.

[izx]

Ah, but for film, 3 are progressive, and 2 are interlaced. So it's a question of the 'greater common good'. Would field-based PP negatively affect the progressive frames?

[Cyberia]

Yea, but No.

At this point in the process, if you are using field_op = NONE, all the output frames are interlaced. In this case, DGIndex is outputting *fields*, not frames. So if you want to use post processing, you need to set the iPP=TRUE flag.

You don't get progressive frames until after you run Telecide or a deinterlacer.

Only if field_op was set to FILM, would get output as frames and then should you set iPP=FALSE.