datahoarder

6785 readers

1 users here now

Who are we?

We are digital librarians. Among us are represented the various reasons to keep data -- legal requirements, competitive requirements, uncertainty of permanence of cloud services, distaste for transmitting your data externally (e.g. government or corporate espionage), cultural and familial archivists, internet collapse preppers, and people who do it themselves so they're sure it's done right. Everyone has their reasons for curating the data they have decided to keep (either forever or For A Damn Long Time). Along the way we have sought out like-minded individuals to exchange strategies, war stories, and cautionary tales of failures.

We are one. We are legion. And we're trying really hard not to forget.

-- 5-4-3-2-1-bang from this thread

founded 4 years ago

MODERATORS

[email protected]

What are you average file sizes for movies and series? (lemmy.pe1uca.dev)

submitted 5 months ago by [email protected] to c/[email protected]

9 comments fedilink hide all child comments

I'm looking at my library and I'm wondering if I should process some of it to reduce the size of some files.

There are some movies in 720p that are 1.6~1.9GB each. And then there are some at the same resolution but are 2.5GB.
I even have some in 1080p which are just 2GB.
I only have two movies in 4k, one is 3.4GB and the other is 36.2GB (can't really tell the detail difference since I don't have 4k displays)

And then there's an anime I have twice at the same resolution, one set of files are around 669~671MB, the other set 191 each (although in this the quality is kind of noticeable while playing them, as opposed to the other files I extract some frames)

What would you do? what's your target size for movies and series? What bitrate do you go for in which codec?

Not sure if it's kind of blasphemy in here talking about trying to compromise quality for size, hehe, but I don't know where to ask this. I was planning on using these settings in ffmpeg, what do you think?
I tried it in an anime at 1080p, from 670MB to 570MB, and I wasn't able to tell the difference in quality extracting a frame form the input and the output.
ffmpeg -y -threads 4 -init_hw_device cuda=cu:0 -filter_hw_device cu -hwaccel cuda -i './01.mp4' -c:v h264_nvenc -preset:v p7 -profile:v main -level:v 4.0 -vf "hwupload_cuda,scale_cuda=format=yuv420p" -rc:v vbr -cq:v 26 -rc-lookahead:v 32 -b:v 0

you are viewing a single comment's thread
view the rest of the comments

[–] [email protected] 18 points 5 months ago (1 children)

Codec has huge impact.

[–] [email protected] 7 points 5 months ago* (last edited 5 months ago)

Yup! Where possible I try to get everything in x265 for this reason. It takes a little more processing power to transpose, but the difference in file size is worth it.

I've heard you'll take a quality hit to re-encode something from x264 to x265, however. If you care about that, it's better to just find a new source recorded with x265 or AV1 (if all your devices can run it).

I'm not very knowledgeable in that end of things, though, so I could be wrong.

Edit: Fixed AVC where I had meant AV1