#x265 — Public Fediverse posts

My 4K Blurays of Westworld arrived in the mail today. I started copying and re-encoding episode 1 of season 2, because I have already watched all of season 1. It's estimated to take 17 hours. Most episodes are going to take about the same amount of time. 4K video is rough to work with! 😅

I guess it will slow down how fast I watch them ...

#Video #Encoding #x265 #4K #SciFi

I am compressing movies with ffmpeg and I don't understand why libx265 is slower than libav1 with the same settings. I have an amd rx 570 gpu and ryzen 5 3600 cpu if that makes a difference.
#x265 #av1 #av1codec #ffmpeg

I have a weird behaviour of #ffmpeg on #NetBSD: when transcoding a video (either from an existing video or from still frames, doesn't matter) with #x264, everything is fine. But when I encode with #x265, the ffmpeg process sets itself to niceness 20. I can trace the system calls, and it does indeed call setpriority with x265, and not with x264, but I cannot find it in the source code.

This happens with both ffmpeg5 and ffmpeg7 on NetBSD, but not on Ubuntu. I haven't yet tested anything else.

Normally I wouldn't mind if a CPU-hungry encoder runs "nice", but I would like to decide that for myself, and in my current setup, the CPU clock modulation daemon ignores nice processes and so doesn't raise the frequency, and so my encoding runs slow. And non-superusers cannot lower the niceness.

Another weird NetBSD problem. Please help or boost.

Got another box of surplus #DVDs to rip. I hadn't ripped anything lately, especially since getting our new mini PC, so this was my first chance to compare #x265 to #AV1 encode on our Minisforum UM890 Pro with a Ryzen 9 8945HS. This thing absolutely rips. AV1 encodes of DVD quality content run at hundreds of fps, depending on the movie. When using Handbrake's best recommended settings and comparing to x265, AV1 goes faster, makes smaller files and looks just as good.

https://handbrake.fr/docs/en/latest/workflow/adjust-quality.html

#Raspberry Pi #HEVC #Decoder #Driver Posted For #Linux #Kernel Review - #Phoronix
https://www.phoronix.com/news/Raspberry-Pi-HEVC-H265-Decode

#H265 #x265

x265 is considerably more efficient than x264. I just re-encoded the entirety of my copy of Farscape, from the same Bluray source discs. Here's a comparison of the final file size for each copy. Settings were as follows:

Both copies were encoded with an RF of 20, 1080p, framerate same as source. The #x264 copy only had a 160 kbps AAC stereo audio track. The #x265 copy included that, but also included an un-touched DTS-HD-MA surround sound track, as well as commentary audio tracks.

#Media

A question for any #digital #video experts out there... I'm confused as heck about the results from #libx265 (used via #ffmpeg, not the #x265 tool) regarding quality vs. preset and ratefactor.

I'm far from the first person to be confused by this, but I haven't found any real answers.

First I'll just show some analysis from some test encodes of a file; ssim and ratefactor numbers are coming from the CSV stats output of libx265.

1/x

#quality #preset #ratefactor #CRF #encode #encoding

Oooohhhhh #x265 v3.6 release notes:

"ARM64 NEON optimizations:- Several time-consuming C functions have been optimized for the targeted platform - aarch64. The overall performance increased by around 20%. SVE/SVE2 optimizations"

Thanks, y'all! I love it when codebases start coding to ARM64 NEON! #FFMPEG #FFMPEG7

Is it just me or is #FFMPEG v7 *way* faster (on #ARM64 at least) when doing multiple things at once? (ie: #nlmeans noise reduction, #crop, then #x265)

I mean these used to take hours and hours on several of my Agatha Christie files (which need noise reduction, crop and encoding). These fly through now at about 30% time reduction per file. Not to mention about 15% smaller size (thanks x265 3.6.x update!)

#FFMPEG7
@lisamelton

About 6 months ago I got a bee in my bonnet about the quality of current codecs. I ended up doing more than 1000 encodes, comparing various codecs, presets and quality settings. A little over a month ago I wrote something up about it.
https://colinmckellar.com/2024/01/11/video-encoder-comparison/
#AV1 #ffmpeg #x264 #x265

I re-encoded my test video with #x265 at the same bitrates and presets, to visually compare with #AV1 in my simple browser tool.

It turns out that the "#hevc in browser" story is much more complicated than with #AV1. It just doesn't work on any browser on my #Android phone - Firefox nor Chrome.

https://caniuse.com/hevc references "wontfix" issues. I guess I'll just compare them in VLC "offline" then, and for web do #x264 instead...

I've been messing with AV1 this week. So, let have a look at some files.

The first image: The 1080p AV1 is 7.6 GB and the 4K BD is over 50 GB. I think it looks pretty good, but the grain is far from perfect, notice in the dark and light areas...

Picture 2 is a 1080p 8.99 GB x265 on the left and the 4k BD again on the right. So, the grain is worse here, but the contrast is better.

Why does the smaller AV1 have better grain? Grain is the most important thing when it comes to file size (behind resolution). Grain requires a ton of information. Most algorithms just remove most of the grain... and for modern shows that were not shot on film, this sometimes doesn't matter much. They look fine unless the scene is really dark, bright, or contrasty. But for film and stuff that was shot with grain, it makes a huge difference. You can use a grain setting when rendering x265; it looks amazing, but the files are 3-5x larger. So, AV1 is a little different. They are removing the grain then synthesizing new grain. It's kinda genius, but it's far from perfect. They first do a softening layer, which looks very ugly imo. What good is grain if everything looks like clay. There is something you can do, and I've done this here... on Handbrake, use the options: film-grain-denoise=0:film-grain=20

This tells handbrake to skip the de-noising then apply the grain after. My big problem now is that I want a little more grain, but I think the grain is what is making the image look slightly washed out when compared to the x.265. Also, the AV1 takes like 12+ hours to encode on my 5950x CPU. It's a mess. As it stands, I think the x.265 does look better due to the contrast, but the grain does look good with AV1. Hopefully this process will get better, because as of now, it's not worth the time.

#av1 #handbrake #filmnoise #filmgrain #rendering #encoding #x265 #bluray #bdrip

So, it ENDED UP being that x265’s asm.S and pixel_*.S had mis-labeled the high depth #x265 option when compiling 10 and 12 bit

AND

I had to add arm64 to set(ARM_ALIASES armv6l armv7l aarch64) in CMakeLists file! WTH, #x265 devs? 😡

GEEZ! The things I do for a static binary!

Also? I know FAR FAR more about compiling now than I used to! Just didn’t wanna have to learn THIS WAY!

Oh, please! Don't talk to me about #AV1! I just got standardized on converting all my video to #x265, x265 w/#HDR, and x265 w/#HDRPlus!

I'm not changing now for a marginal benefit - and even smaller hardware-based encoding/decoding support!

If any #MacPorts programmers are on here and wish to add this diff to the official #X265 port - which currently has no maintainer, please do!

I would appreciate you forever! If I knew how to do it, I would!

https://trac.macports.org/ticket/66455

OOoohh! I just statically compiled AtomicParsley for Synology doing the same instructions except adding "LDFLAGS=-static " to the #make command. It worked!

Okay, so I did #FFMPEG earlier, #x264 / #x265, and now I did #MP4Box and #AtomicParsley!

My workflow is almost complete on #Synology!

I'm also completely thrilled that - after installing Docker Desktop - it was this easy!

--markers --audio-lang-list eng,deu,spa,fra --all-audio --audio-copy-mask aac,ac3,mp3,dts,dtshd --audio-fallback aac --subtitle scan -F --subtitle-lang-list=eng,deu,spa,fra --first-subtitle --subtitle-burned=none --quality 23.0 --format av_mp4 --encoder-preset slower

nice HandBrakeCLI -i /dev/sr1 -o '/home/arm/media/transcode/movies/NAME/NAME.mp4' --main-feature --preset "HQ 576p25 Surround" --markers --subtitle scan -F --audio-lang-list eng,deu,spa,fra --all-audio --audio-copy-mask aac,ac3,mp3,dts,dtshd --audio-fallback aac --subtitle-lang-list=eng,deu,spa,fra --first-subtitle --quality 23.0 --format av_mp4 --encoder-preset slower >> /home/arm/logs/NAME.log 2>&1