[HN Gopher] AV1 Video Codec ___________________________________________________________________ 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. ___________________________________________________________________ (page generated 2022-05-09 23:00 UTC)