this post was submitted on 24 Feb 2024
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Nearing the filling of my 14.5TB hard drive and wanting to wait a bit longer before shelling out for a 60TB raid array, I've been trying to replace as many x264 releases in my collection with x265 releases of equivalent quality. While popular movies are usually available in x265, less popular ones and TV shows usually have fewer x265 options available, with low quality MeGusta encodes often being the only x265 option.

While x265 playback is more demanding than x264 playback, its compatibility is much closer to x264 than the new x266 codec. Is there a reason many release groups still opt for x264 over x265?

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[–] ChaoticNeutralCzech@feddit.de 61 points 8 months ago (12 children)

x265 playback is more demanding than x264 playback

By a factor of 2 with the same bitrate. But you only need half the bitrate for the same quality (SNR) so it really isn't.

However, encoding is about 10x more demanding in terms of bitrate, or 5x for the same quality. This may be worth it for long-term storage or wide distribution over limited bandwidth (torrenting), but not for one-time personal use.

[–] iturnedintoanewt@lemm.ee 17 points 8 months ago (11 children)

For a Jellyfin server however it's quite a boon.

[–] Saik0Shinigami@lemmy.saik0.com 9 points 8 months ago (4 children)

Only if you're disk limited or bandwidth limited. And in many cases will lead to transcoding the content, which could be a problem if you're CPU limited or have no GPU for hardware transcoding.

Everything (not literally... but figuratively) can do x264. Not everything can do x265...

[–] iturnedintoanewt@lemm.ee 2 points 8 months ago* (last edited 8 months ago) (1 children)

If your Jellyfin collection starts to grow big enough, and x264 transcoding on the fly is as easy as passing through the GPU these days...it's pretty much a no brainer. You have small files, and if someone still needs x264 (which would need to be specifically a Firefox streamer, as I believe Chrome supports it, and the Jellyfin apps also support it if your computer/phone does), the transcoding on the fly can be done using about 1-2% of the server CPU. I did something like 12 simultaneous different transcodes once, and my oldish i5 9500T held its ground perfectly, I think it reached about 35% CPU at the peak of it.

[–] Saik0Shinigami@lemmy.saik0.com 1 points 8 months ago (1 children)

9500T has quicksync. That's why you're transcodes were only 1-2% on the cpu. You were doing transcoding on the built in gpu.

It is NOT trivial to do transcode without hardware decoding. How much utilization was on your 630 iGPU in that scenario?

[–] iturnedintoanewt@lemm.ee 1 points 8 months ago* (last edited 8 months ago) (1 children)

Well it's a Jellyfin server. I bought a CPU that CAN transcode, for this specific purpose. Without hardware decoding, CPU usage scales quite quickly, but it could still hold 3-4 streams at 60fps I believe. At any rate, I bought this 2nd hand microPC with the specific purpose of being a Proxmox server with Jellyfin transcoding. And so, between having to consider further hard drive upgrades, or using the transcode function...I kinda choose the cheapest one since it's at hand.

[–] Saik0Shinigami@lemmy.saik0.com 1 points 8 months ago* (last edited 8 months ago)

Congrats? I'm running my Plex server on enterprise hardware. There's no onboard gpu for decoding because that's not the purpose of that hardware. I do have a graphics card in there to do transcodes, and intimately monitor that usage. My original statement still holds. "which could be a problem if you’re CPU limited or have no GPU for hardware transcoding."

Transcoding may not be that accessible/useful for some people. I'd rather waste some drive space than do transcodes for every user, but that's because I have 400TB(not a typo) of space but don't have enough space to put in any card that takes up more than 1pci slot. In my mind throwing another 20TB drive into my configuration is easier and cheaper than transcoding. In a couple of years we're going to be having this discussion for AV1 anyway.

Edit: Oh, and 3-4 streams at 60fps, isn't enough description... really doesn't cover the most taxing part of the transcode process, which is resolution. 3-4 1080p streams is much easier than even 1-2 4k streams. Considering that content is trending towards higher resolutions rather than higher framerates, I'm not sure what you're getting at. My T600 can do 3-4 4k streams before it starts running into problems. That should be something like 15-16 1080p streams. Considering my library, I'd still rather have the drives in a more accessible format that will direct play on more devices than transcode my 60-100mbps 4k videos. Keep the transcoding for those that really need it rather than making it the default answer.

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