vmaf
Av1an
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vmaf | Av1an | |
---|---|---|
41 | 65 | |
4,189 | 1,345 | |
2.5% | - | |
8.9 | 7.3 | |
12 days ago | 4 days ago | |
Python | Rust | |
GNU General Public License v3.0 or later | GNU General Public License v3.0 only |
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vmaf
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Extreme Video Compression
Netflix did VMAF for this: https://github.com/Netflix/vmaf
It checks a reference video against an encoded video and returns a score representing how close the encoded video appears to the original from a human perspective.
- Netflix/VMAF – Release v3.0.0
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Linux GUI/Frontend for VMAF
Not sure this is the right sub but I'm going to encode my entire BluRay collection in AV1 / NVEC. I'd like to optimize settings with VMAF but would like an ubuntu/debian based GUI to work with.
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Does anybody run libvmaf on your output as a validation check?
VMAF for anybody that doesn't know quantifies the quality difference between a source and modified video.
- How do you guys visually compare clips?
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reduce video filesize
Netflix even has a method to measure perceivable quality difference. A little while ago I used this tool to calculate this.
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How did my silly little After Effects filter reduce the file to 10% its size? The footage wasn't raw or 10-bit or anything, and I rendered it out at basically the same resolution (cropping aside). How did I do this????
Well you can use something like https://mediaarea.net/en/MediaInfo to look at the files and https://github.com/Netflix/vmaf to see if there is no loss.
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[HUB] Reddit Users Expose Steve: DLSS vs. FSR Performance, GeForce RTX 4070 Ti vs. Radeon RX 7900 XT
Vmaf exists
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4:2:0 10-bit HEVC vs 4:2:2 10-bit AVC codecs higher quality? (S5II, GH6)
You can try some tests https://github.com/Netflix/vmaf
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Unusually good compression ratio - Sanity Check
You can try VMAF as well (which ffmpeg supports). It's normally recommended to make a lossless copy first as a baseline too
Av1an
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Guide to Adopting AV1 Encoding
The hardware encoders are very fast and generally better than x264 (but not by as much as you'd think with the x264 slow preset).
In addition, there are threaded AV1 encoders you may be overlooking, like SVT-AV1. For non-realtime, my favorite is av1an, which also yields better quality than is possible from aomenc: https://github.com/master-of-zen/Av1an
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I have a feeling crunchyroll should be using AV1
I specifically used https://github.com/master-of-zen/Av1an with --target-quality 100 to keep the compression as close to lossless as possible (you could probably shave even more size off if you didn’t use near-lossless compression)
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Automatic choose encode settings?
There's also Av1an as suggested by someone else. It's going to produce more efficient encodes because it uses chunk-based encoding to reach the required VMAF for every single chunk, but this is also slower because every chunk will be re-encoded until the VMAF target is reached. It's also a PITA to compile, has a long list of bugs, and isn't very actively developed. One of the long-standing issues is that frames have a tendency to go missing during splitting, which IME is going to keep happening when the input files aren't standardized. And thus the recommendation is to transcode the input to lossless first, which is just completely unsustainable.
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Building pc for ffmpeg rendering
i'm still trying to figure out if av1an is the breakthrough to using large CPU counts without losing quality. but it's a ridiculously poorly documented program. i haven't gotten it to run effectively yet. https://github.com/master-of-zen/Av1an
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Codecs for the 4K Era: HEVC, AV1, VVC and Beyond
I don't know about VVC, but I've never seen a recommendation of preset 0 for SVT-AV1. The docs say "presets 1-3 represent extremely high efficiency, for use when encode time is not important and quality/size of the resulting video file is critical". It seems like 0 is the equivalent placebo preset. But if you want AV1 with coding efficiency over all else, IIRC the typical approach is to use av1an to detect scene transitions and farm out parallel encodes with aomenc.
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Automating av1 encoding?
That might be because it doesn't work.
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VMAF is confusing me
Have you seen Av1an? It's supposed to encode to a target VMAF.
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Trying to use av1an without success
Are you using the current version, 0.4.0, from https://github.com/master-of-zen/Av1an/releases
- Av1an - Cross-platform command-line AV1 encoding framework written in Rust
- Av1an: Cross-platform command-line AV1 encoding framework written in Rust
What are some alternatives?
staxrip - 🎞 Video encoding GUI for Windows.
HandBrake - HandBrake's main development repository
FFmpeg-Builds
SVT-AV1
FFmpeg-Builds - FFmpeg Builds for yt-dlp
FastFlix - FastFlix is a free GUI for HEVC and AV1 encoding, GIF/WebP/AVIF creation, and more!
ffmpeg-debug-qp - FFmpeg Debug Script for QP Values
NotEnoughAV1Encodes - GUI for AV1 (aomenc, rav1e & svt-av1)
Pulsar-VMAF - Hardware-based VMAF
ssimulacra2 - SSIMULACRA 2. Perceptual metric.
ab-av1 - AV1 re-encoding using ffmpeg, svt-av1 & vmaf.