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2nd February 2019, 00:43 | #1421 | Link |
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You should read the context of the question that answer was to. ;-)
To make sure its not lost again, let me paraphrase: Q: Scalable Video, or Scaling with Hardware? A: Hardware.
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LAV Filters - open source ffmpeg based media splitter and decoders Last edited by nevcairiel; 2nd February 2019 at 00:50. |
2nd February 2019, 02:47 | #1422 | Link |
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OK... I see. Exactly what they were thinking when they used this acronym, which, as Ben points out, is confusingly similar to Scalable Video Coding and Scalable HEVC Video Coding, I don't know. Nothing to see here... move along.
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3rd February 2019, 17:47 | #1423 | Link |
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Intel SVT-AV1 benchmarks: https://twitter.com/fg118942/status/1092045469981671424
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4th February 2019, 19:41 | #1425 | Link | |
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I wish tests would provide the actual per-frame VMAF scores instead of just a mean. For real-world duration stuff, variability of quality can hurt subjective quality in a way that VMAF itself won't capture. Keyframe strobing on one frame every 5 seconds doesn't drag down the mean much, but it can be a very annoying artifact viewers can clap along to. |
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4th February 2019, 20:31 | #1426 | Link | |
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The only thing is that such graphs would tend to be limited to having a single bitrate or quality setting since the bottom axis in such a situation would be time rather than bitrate. ...which might very well be why people don't do it - because they want to show a single graph with various differing bitrates rather than a really detailed graph but only at a single bitrate or quality setting. EDIt: A 1% low graph would at least let you do this, but it would still also require making a second graph (unless you don't even care about the mean at all, in which case you could just graph a 1% low and call it a day).
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4th February 2019, 20:37 | #1427 | Link |
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We get SSIM graphs with per-frame curves, so its not that of a "new" idea to also do that for VMAF or the likes.
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LAV Filters - open source ffmpeg based media splitter and decoders |
5th February 2019, 00:56 | #1428 | Link | |
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But the actual VMAF output is just per-frame scores, so anyone publishing a mean VMAF already has the data. Even if they don't want to plot the data, they could still make the log files available for download. |
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5th February 2019, 03:24 | #1429 | Link | |
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https://www.dropbox.com/s/nbnlsicvsl..._60fps.7z?dl=0 I am encoding it with tune ssim because I followed the instructions in this article. https://www.streamingmedia.com/Artic...ok-127133.aspx I may not be able to answer difficult questions as I am not good at English. Last edited by fg118942; 6th February 2019 at 10:12. Reason: To indicate the existence of video |
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5th February 2019, 16:57 | #1430 | Link | |
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6th February 2019, 10:03 | #1431 | Link | |
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https://personal.sron.nl/~pault/imag...test_small.png Avif file was different from source... (text wasn't readable), so i removed Code:
--color-primaries=bt709 --transfer-characteristics=bt709 --matrix-coefficients=bt709 I'm thinking about conversion my 12bit raw photos to avif. Is is possible? What pix_format shoul I use? |
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6th February 2019, 11:46 | #1432 | Link | |
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Also, the video encoded with SVT-AV1 has been uploaded here. https://www.dropbox.com/s/nbnlsicvsl..._60fps.7z?dl=0 |
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6th February 2019, 18:27 | #1433 | Link |
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New uploads: (MSYS2; MinGW32: GCC 7.4.0 / MinGW64: GCC 8.2.1)
AOM v1.0.0-1299-g54eabb5c8 rav1e 0.1.0 (2cec0f9 / 2019-02-06) dav1d 0.1.1 (caca572 / 2019-02-06) |
6th February 2019, 21:05 | #1434 | Link | |
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6th February 2019, 21:07 | #1435 | Link | |
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6th February 2019, 21:09 | #1436 | Link | |
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7th February 2019, 08:48 | #1437 | Link | |
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7th February 2019, 11:07 | #1438 | Link | |
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7th February 2019, 11:23 | #1439 | Link | |
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and there is commands from encode.ST.sh Code:
./bins/ffmpeg -r 1 -y -hide_banner -loglevel fatal -i "$1" -vf scale=out_color_matrix=bt709:flags=lanczos+accurate_rnd+bitexact+full_chroma_int+full_chroma_inp,format=yuv420p10le -strict -1 "temp/orig_$filename.y4m" ./bins/aomenc --threads=4 -v --cpu-used=4 --end-usage=q --cq-level=$quality --sharpness=7 --bit-depth=10 --full-still-picture-hdr --color-primaries=bt709 --transfer-characteristics=bt709 --matrix-coefficients=bt709 --ivf -o "encoded/$filename.ivf" "temp/orig_$filename.y4m" Last edited by kanaka; 7th February 2019 at 11:34. |
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7th February 2019, 19:57 | #1440 | Link | |
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709 was the compromise for HD to make it "international" - as the average of the two, if 601 gets treated as 709 or vise versa, that minimizes the worst-case error compares to 601 PAL <> 601 NTSC. https://en.wikipedia.org/wiki/Rec._7...chromaticities As a parochial American, I thought 709 was dumb when it came out, but I have since gained the wisdom to appreciate its simple brilliance. |
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