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/tech/ - Technology

"Technology reveals the active relation of man to nature" - Karl Marx
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File: 1667609095903.png (5.91 MB, 3840x2160, av1.png)


Is this gonna be the replacement for both VP9 and H.265/HEVC?
Royalty free
Better quality and more efficient compression than both, however apparently slow as hell to encode
It can be multiplexed into .mkv, .webm and .mp4
It's currently being gradually, tentatively rolled out on pretty much every major streaming platform you can think of to replace VP9

4K sample: https://www.elecard.com/storage/video/Stream1_AV1_4K_8.5mbps.webm

https://aomedia.googlesource.com/aom/ Reference implementation written in C, supported by FFmpeg
https://gitlab.com/AOMediaCodec/SVT-AV1 BSD-licensed implementation started by Intel and Netflix and targeted to be flexible for different applications, supported by FFmpeg
https://github.com/xiph/rav1e BSD-licensed lightweight encoder written in Rust and designed for speed, supported by FFmpeg
https://code.videolan.org/videolan/dav1d BSD-licensed lightweight decoder written in C, supported by Handbrake
https://chromium.googlesource.com/codecs/libgav1/ Apache-licensed decoder developed by Google


File: 1667613881440-0.png (1.82 MB, 1920x804, 1.png)

File: 1667613881440-1.png (1.99 MB, 1920x804, 2.png)

File: 1667613881440-2.png (1.87 MB, 1920x804, 3.png)

Snaps of a 1080p (anamorphic) AV1 rip of The Matrix Resurrections




I tried encoding a 10-second clip with this on my potato laptop, it lagged like hell while making the CPU fan go crazy


File: 1668767676323.png (2.37 MB, 1920x1040, 3.png)

I like the implementation of grain synthesis in av1 as a method of preserving film grain at low bitrates which avoids the pitfalls of other methods such as oversharpening (psy RD in x264) and the inaccuracy of post-processing filters/noise generators. See picrel for an example screenshot taken from a file encoded at only 3 mpbs.


Encoding is definitely slow with AV1, I think it will work great once hardware encoders are common. I believe the h265 encoder is also slow (idk how it compares to av1), and h264 will still be a lot faster than both of them.


File: 1670149892986.png (17.89 KB, 826x226, ClipboardImage.png)

Google's Tensor SoC which they use in the Pixel 6 has special hardware acceleration specifically for their own special AV1 decoder
Not sure if it really matters when you can't reliably encode high quality and fast yet

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