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3rd June 2008, 00:28 | #1 | Link |
primus inter pares
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h264 LOSSLESS experiences
if you do a 1080p24 encode with the lossless mode, what bitrates are we talking about (yeah i know, content...)
But what are your experiences? And how many of you use it (at least sometimes) KornX
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6th June 2008, 19:29 | #2 | Link |
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depends on what video you try to encode losslessly of course
so try it yourself on the for you relevant content
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6th June 2008, 22:16 | #3 | Link |
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Hi,
are you talking about perceptually lossless or really lossless (QP = 0)? In the latter case it's possible that you get data rates exceeding those of raw uncompressed YUV files, in the former case - of course depending on the content - you can expect some 20 to 50 MBits/s Dust Signs
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6th June 2008, 22:27 | #5 | Link |
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I wrote that it is possible and I experienced one such case myself when IPCM mode was accidently disabled. But anyways, using lossless mode makes no real sense to me because the bit rate required is extremely high and the difference to a file encoded with p.e. CRF 16 is perceptually zero.
Dust Signs
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6th June 2008, 22:30 | #6 | Link | |
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6th June 2008, 22:33 | #7 | Link | |
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Quote:
Dust Signs
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The number you dialed is imaginary. Please turn your phone by 90° and try again Last edited by Dust Signs; 6th June 2008 at 22:36. |
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11th June 2008, 23:32 | #8 | Link |
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I'm doing my first lossles try right now. The source is a 01:31:20 old anime movie on DVD. It needs a lot of denoising, which I'm not doing right now. The lossles pass is only for AnimeIVTC. After 75% the projected filesize is of 12.8GB.
I'm using MeGUI's CQ-Lossless profile: Code:
--qp 0 --nf --subme 1 --partitions p8x8,b8x8,i4x4 --merange 12 --threads auto --thread-input --progress --no-psnr --no-ssim --output |
11th June 2008, 23:45 | #9 | Link | |
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12th June 2008, 00:07 | #12 | Link |
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I think --merange does not apply to "hex" mode, only "umh" and higher...
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12th June 2008, 00:21 | #15 | Link |
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Sorry, I was mistaken
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12th June 2008, 23:12 | #16 | Link |
Angel of Night
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If you want a lot more speed out of lossless, just turn cabac off. It'll be slightly larger but not as much as you'd expect. You lose a lot less efficiency than you do at low bitrates, since so many of the randomer high quantizers are present.
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12th June 2008, 23:16 | #17 | Link | |
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(thanks to akupenguin for this chart) But yes, overall, its definitely worth turning off given the very large speed boost one gets; (de|en)coding lossless is nearly pure entropy (de|en)coding.
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1080p24, avc, h264, lossless, x264 |
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