Deinterlace BEFORE filters?

tcmbackwards · March 3, 2019, 3:11pm

I have a lot of video that was originally recorded interlaced, and was digitized at the wrong resolution with anamorphic enabled, so the videos have huge pillarbox areas and chunks of blank overscan lines.

So I need to do the following:

Deinterlace with bob
Crop off between 10 and 50 lines of overscan on top and bottom and about 60 lines on each side
Resulting video will be about 600x470, scale it to 640x480 so I can get rid of the anamorphic distortion and end up with square pixels
Maybe add sharpening or hue correction

Since Shotcut (apparently) only deinterlaces after applying other filters, the scaling filters will ruin the deinterlace by shifting lines out of the fields they were originally in. However some of these videos are hours long and I hate to just deinterlace to a lossless file first.

Is there any way to deinterlace before filtering?

shotcut · March 3, 2019, 6:56pm

Shotcut does not offer bob deinterlacing.

Since Shotcut (apparently) only deinterlaces after applying other filters

That is completely wrong. It does deinterlace before other filters including scaling. See this file below. It defines filters in the engine that are added automatically before all manually specified filters:

github.com

mltframework/mlt/blob/master/src/modules/core/loader.ini

# This file defines the normalisers, their fallbacks and the order they're attached
#
# The names on the left are arbitrary, but the order in which they occur is the
# order in which they're applied.
# 
# The names of the services on the right dictate the preference used (if unavailable
# the second and third are applied as applicable).

# image filters
deinterlace=deinterlace,avdeinterlace
fieldorder=fieldorder
crop=movit.crop,crop:1
rescaler=movit.resample,swscale,gtkrescale,rescale
resizer=movit.resize,resize

# audio filters
channels=swresample,audiochannels
resampler=resample

tcmbackwards · March 4, 2019, 12:22am

Okay good to know. It’s confusing having all the interlacing settings in the export window, plus I’m coming from virtualdub where deinterlacing is its own filter.

system · June 1, 2019, 3:11pm

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