7 ms·
As someone who has been reading a lot of AV1 benchmarks over the last few months, it's also unclear to me how/why they're doing it. AV1 (and specifically google
by motbob 6y ago
As someone who has been reading a lot of AV1 benchmarks over the last few months, it's also unclear to me how/why they're doing it. AV1 (and specifically google's libaom) is great, and for VOD-based content it is ready for primetime, but h264 is better for realtime streaming from just about every standpoint.
Though, AV1 is way, way better than h264 when bitrates are super low... I don't know. I wish I had more details about the implementation.
- jplayer01 6y agoHow low is super low and what's the picture quality like? Could it be they're trying to save bandwidth?
- motbob 6y agoThe best definition for "super low" that I can come up with is "bitrates at which x264-encoded content becomes hilariously unwatchable." I will try to be more specific. Youtube uses x264 to encode videos at a certain bitrate. Were you to encode the same video with libaom (AV1) at the same bitrate, the quality difference would probably be noticeable to a casual viewer. If you were to cut the bitrate in half and run the same comparison, the quality difference would be extremely noticeable to a casual viewer.
- ehsankia 6y agoThe article has a gif showing this. The right side is hilariously blocky, while the left is decent. Visually, from experience, it looks like somewhere between 100 to 200 kbps. EDIT: Err, I'm stupid it says 30kbps right there. Though that definitely looks closer to 100 to me (unless framerate is lower)
- aikinai 6y agoAs someone up-to-date on AV1, what are your thoughts on it compared to HEVC?
- motbob 6y agoFor chunked encoding and distribution on a massive scale (Netflix/Youtube), AV1 is the clear choice today. For making encodes for personal use, HEVC/x265 is the clear choice today, and it probably will be for a long time. If you want to use AV1/libaom and see significant efficiency gains over HEVC/x265, you will have to allocate a lot more encoding time. There's no way around that. You will also not be able to make use of multithreading to a significant degree, for libaom at least (I have not seriously tested other encoders). There are third-party programs in active development that perform chunked AV1 encoding for the purpose of utilizing all your cores. aom --cpu-used=5 is currently strictly better than x265 --preset veryslow, putting aside the threading issue. Beats it in encoding time and efficiency. But it's an unfair comparison.
- aikinai 6y agoSuper helpful reply and tells me exactly what I needed to know (I'll stick with HEVC). Thanks!
- mikece 6y agoAV1 features better compression for the same image quality and a key selling point is that it's patent free. Facebook and YouTube are pushing for AV1 adoption as that's going to save them $$$ on bandwidth. We'll see. More info: https://www.videoproc.com/media-converter/av1-vs-hevc.htm https://www.videoproc.com/media-converter/av1-vs-hevc.htm