Half interlaced, half not? Question for clarity

[Silent_Strider]

Hello everyone,

I recorded a movie from DVB-C. Usually I just deinterlace those records (as long as they're SD quality).

Now I used ffmpeg in Interlace Detection Mode and got these results:

Code: Select all

Rascal Does Not Dream of a Dreaming Girl.mpg:  
[Parsed_idet_0 @ 0000018a27327e40] Repeated Fields: Neither:112894 Top:  8032 Bottom:  7856
[Parsed_idet_0 @ 0000018a27327e40] Single frame detection: TFF: 40400 BFF:   140 Progressive: 19305 Undetermined: 68937
[Parsed_idet_0 @ 0000018a27327e40] Multi frame detection: TFF: 98155 BFF:    46 Progressive: 30581 Undetermined:     0

Now... would that file be interlaced or not?

According to single frame detection, 31.37% are TFF, 0.11% are BFF, 14.99% are progressive and 53.53% are undetermined.

Makes it kinda difficult to understand those results.

If encoded with "Interlace detection: Default" it ends as:

Code: Select all

Rascal Does Not Dream of a Dreaming Girl.mkv:  
[Parsed_idet_0 @ 000001c6a69fb480] Repeated Fields: Neither:122959 Top:   127 Bottom:    26
[Parsed_idet_0 @ 000001c6a69fb480] Single frame detection: TFF:   220 BFF:   469 Progressive: 42176 Undetermined: 80247
[Parsed_idet_0 @ 000001c6a69fb480] Multi frame detection: TFF:   297 BFF:  1749 Progressive:121066 Undetermined:     0

[mduell]

Use decomb and see how you like the output. Tune as necessary.

[Woodstock]

Looking at the bluray version of this title, there are a lot of scenes that will fool interlace detection on the non-interlaced source, so I'd say turn comb detect off.

What does handbrake say about it?

[Silent_Strider]

What does handbrake say about it?

I guess you mean in the activity log?

Code: Select all

Stream #0:0: Video: mpeg2video (Main), yuv420p(tv, top first), 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 1k tbn, 50 tbc (default)

[Woodstock]

OK, so it's a file created from a PAL source, which explains why it's not something that would show up in the North American market.

I'd disable comb detect, use BOB for the de-interlace method, and set the frame rate to "Variable", "Same as source". That's what has worked for me on similar sources.

[Silent_Strider]

Thanks for your suggestions. Too bad Handbrake doesn't show a tooltip about the Decomb options (Default, Bob, Eedi2, Eedi2bob)