[HN Gopher] AV1 Video Codec
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AV1 Video Codec
Author : doener
Score : 28 points
Date : 2022-05-09 21:18 UTC (1 hours ago)
(HTM) web link (aomedia.org)
(TXT) w3m dump (aomedia.org)
| deadmutex wrote:
| What is new here?
| jonny_eh wrote:
| I assume it's because this hit the front page:
| https://news.ycombinator.com/item?id=31317989
| mawise wrote:
| Given that discussion around licensing, what's the licensing
| story around AV1?
| lynguist wrote:
| > non-sublicensable, perpetual, worldwide, non-exclusive,
| no-charge, royalty-free, irrevocable
|
| According to its license which is very short and can be
| read here:
|
| https://code.videolan.org/videolan/dav1d/-/blob/master/doc/
| P...
| yjftsjthsd-h wrote:
| What's the state of encoding? I'd like to try moving some videos
| to AV1, but I'm not willing to wait... IIRC, it was literally
| days of encode time for minutes of video last time I tried.
| mikenew wrote:
| With ffmpeg 5 using libaom it's actually reasonable. Obviously
| it depends on quality and whatnot, but I'm able to get about
| .25X of realtime playback speed with AV1 encoding. The magic
| switch is setting -cpu-used to something higher than the
| default of 1, which is go-on-vacation-and-maybe-it-will-finish
| slow.
|
| Rough example: `ffmpeg -i video.mkv -c:v libaom-av1 -cpu-used 5
| av1_test.mkv`
| out_of_protocol wrote:
| https://people.videolan.org/~unlord/SVT-AV1_BD-rate.png
|
| Comparation between codecs and encoder presets. At the same
| speed SVT-AV1 gives better quality vs h264, h265. M10-M8 look
| like nice spot
| kasabali wrote:
| AFAIK state of the art is using fast presets of SVT-AV1,
| combined with Av1an [0] for parallelism.
|
| [0] https://github.com/master-of-zen/Av1an
| lynguist wrote:
| See here for performance benchmarks on dav1d (av1 encoder):
|
| https://openbenchmarking.org/test/pts/dav1d#results
|
| Edit: It's false! This is just a decoder, not an encoder! I
| just learned it.
|
| Here is the link for the performance benchmarks for SVT-AV1,
| the most popular encoder as I just learned:
|
| https://openbenchmarking.org/test/pts/svt-av1
| cogman10 wrote:
| dav1d is an av1 decoder
| ______-_-______ wrote:
| We just need to hold out hope for the release of dav1e
| lynguist wrote:
| Does Team Videolan have anything like it on their
| roadmap?
| sp332 wrote:
| It's not a videolan project, but is rav1e the kind of
| thing you're looking for?
| post-factum wrote:
| svt-av1 is pretty fast. Well, depending on crf/preset etc of
| course, but in general, the more cores you have, the easier it
| is to get realtime encoding with decent quality. You may want
| to try ab-av1 first, and then go and play with ffmpeg manually
| if the result does not satisfy your needs.
|
| For other encoders that do not do parallel encoding that well
| there are things like av1an.
| cogman10 wrote:
| The current preferred encoder is SVT-AV1 [1]. It has pretty
| good CPU/space tradeoffs, so you can pick how long you are
| willing to wait for a video to encode.
|
| [1] https://github.com/AOMediaCodec/SVT-AV1
| Ameo wrote:
| I've used this with FFmpeg with great success. Encoding time
| and video quality is comparable to other encoders, and file
| size almost always smaller.
| SemanticStrengh wrote:
| This chart is well know, has kt been reproduced on other
| datasets?
| causality0 wrote:
| I'm all for people forging ahead on AV1, but I'm not personally
| bothering with it yet. Most of my library is currently in HEVC
| and I'm not going to switch until I don't even have to think
| about whether all my equipment supports hardware AV1 decoding.
| pkulak wrote:
| The more stuff you store away in a format that you can't decode
| for free, the worse off you're gonna be, trust me. I recently
| started self-hosting my family's photos and videos, and the
| HEVC and HEIF stuff was a huge pain in my ass to deal with.
| Lucky for me everything before 2016 was untainted, any no one
| had yet bothered to turn on 4k-60p on any of their phones
| (making transcoding on my poor NAS's CPU nearly impossible), or
| I'd have been in real trouble.
| SemanticStrengh wrote:
| The world bloats storage by 50% which harm user experience
| and ecology. That's a lot of regress while all it take is one
| symbolic dollar for a lifetime license..
| stingraycharles wrote:
| I find it incredibly difficult to find out from this site what
| exactly differentiates AV1 from, say, x264/5.
|
| The introduction appears to only be a legal disclaimer?
| brigade wrote:
| Relative to VP9, https://arxiv.org/pdf/2008.06091.pdf is a good
| reference. The technical details on the official AOM site are
| pretty much just the raw specs and code.
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(page generated 2022-05-09 23:00 UTC)