Seperis (seperis) wrote,
Seperis
seperis

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a tale of three weirdness

Question for anyone who knows video compression/encoding:

Assume the following:
1.) In MakeMKV, I'm using a cleanly ripped movie with all English audio and subtitle tracks. All the same settings are used as literally hundreds of other movies.
2.) In Handbrake, I'm using the same well tested profile to create a 2160p version of a 4K movie that I make with extra AAC streams for each DTS audio stream.

Under what circumstances would the 2160p increase the size of the video stream?

I verified it's the video stream offending, and we're talking a 3-6 GiB to around 20 GiB increase in video stream size (and therefore file size).

This has only happened with these movies (in order of size increase of video stream):
Groundhog Day (2018 release) - less than 2 GiB
Ghostbusters 2 (2016 release) - less than 2 GiB
Pet Sematary 1989 (2019 release) - 6-8 GiB (estimate)
Ghostbusters 1984 (2016 release) - 30 GiB
Scarface Gold Edition (2019 release) - 15 GiB - 30 GiB (estimate)

The second weirdness the 4K of some of these movies is grainy.

Example: Groundhog Day, Ghostbusters 1984. I changed the 2160p profile's Constant Quality from RF-18 to RF-20 for Groundhog Day and RF-22 for Ghostbusters; the 4K lost a lot (most to my eye) of the graininess.

The third weirdness is that Plex does not like these rips very much, especially Ghostbusters 1984; it would nope out at 37 minutes. I watched it end to end on my laptop using VLC; it was fine, there was no flaw. It's possible there's one VLC won't pick up, but Plex is almost as good as X-Box at playing anything provided the codec is supported and it was. Noping out generally means there's a real problem but none.

With the re-encoded 2160p version, it doesn't nope out.

I feel like I'm either missing something, or there's off about that video stream. I get this is an upscale, but in general, compression shouldn't improve video quality. Posted at Dreamwidth: https://seperis.dreamwidth.org/1086796.html. | You can reply here or there. | comment count unavailable comments
Tags: handbrake
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