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29th March 2017, 15:50 | #1 | Link |
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AV1, VP9, x265, x264 low bitrate comparison
I made some test with the new AV1 codec from aomedia and I made some captures for comparison :
https://vincenttschanz.github.io/1ko...ec-comparison/ The goal was to use a very low bitrate to see which encoder will give better result and how the picture will be degraded. Don't hesitate to tell me if I made mistakes or if I can refine the comparison, thanks. Last edited by karasu; 29th March 2017 at 16:44. Reason: words |
29th March 2017, 16:36 | #3 | Link |
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Nice comparison!
I think VP9 wins. And I'm a bit disappointed by x265. Worm like artefacts in frame 226 and look at the street lamp (bottom left) in frame 399
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29th March 2017, 18:50 | #6 | Link |
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Most of the improvements in AV1 over VP9/HEVC are still kept as experiments that need to be enabled during compile time, might be interesting to try a couple of those out.
Still good to see VP9 beating out HEVC, would have thought the performance was slightly worse. Encoder improvements maybe? |
29th March 2017, 20:11 | #8 | Link | |
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Edit: the slide at 40:20 gives a list of enabled experiments to show the progress over the default build. Last edited by bstrobl; 29th March 2017 at 20:15. |
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29th March 2017, 20:33 | #10 | Link |
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and here the experiments that are adopted and now default:
https://aomedia.googlesource.com/aom.../configure#471 |
29th March 2017, 20:39 | #11 | Link |
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To be honest all look terrible. Besides who on earth encodes blu-ray collection using such ridiculously low bitrate? Less than 600kbps for 1920x800? Audio E-AC3/DTS has bigger bitrate than this! Increase bitrate to some more sane levels (1.5Mbps-2Mbps) and you will see that competition is better in retention of fine details.
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30th March 2017, 07:12 | #13 | Link | |
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Also, current encoding speed is also a problem IMO. |
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30th March 2017, 11:01 | #15 | Link |
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If think it would be also nice to see all 4 encodes with a 1000kb/s and 1500kb/s bitrate. I wonder if vp9 will still be the winner...
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30th March 2017, 16:24 | #16 | Link |
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VP9 and AV1 use golden frames, which means every Nth frame has much higher quality than the rest of them. So looking at individual frames can be misleading, because if you're looking at golden frames, or a few frames after them, the quality is much higher than the average quality of the video. x264 and x265 doesn't cheat like that, not to mention golden frames introduce a rather annoying effect during normal playback, i wish codec developers would abandon this technique (but they won't, because it improves the metrics...).
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30th March 2017, 17:56 | #18 | Link |
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30th March 2017, 18:44 | #19 | Link | |
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Generally, I don't think it makes sense to test AV1 without enabling many of the experiments (I expect most of them will be part of AV1). Which one to enable is also not known and won't until they'll evaluate them and either drop or accept them as default. So that would be at the time near bitstream freeze. |
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30th March 2017, 20:27 | #20 | Link | ||
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Quote:
Quote:
Last edited by Tommy Carrot; 30th March 2017 at 20:31. |
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