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16th April 2017, 03:44 | #5201 | Link | |
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19th April 2017, 17:00 | #5207 | Link | |
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I'm always startled to find someone still using a 32-bit OS. I think all my systems have been 64-bit since Win 7 came out back in 2009. Living in 4 GB of RAM for video apps was impractical a long time ago. Adobe dropped 32-bit support in their video apps back in 2010. And 64-bit is generally faster and quite a bit more secure. 64-bit software decoders are generally faster than 32-bit versions as well. I recommend folks upgrade to 64-bit OSes rather than trying to make x265 run better on 32-bit! |
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19th April 2017, 18:05 | #5208 | Link |
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Haivision contributions to the x265 open-source initiative have pushed boundaries
Haivision was one of the four original commercial sponsors of x265, and four years later, we can finally go public with this! They have been a terrific partner over the years, continually investing in x265 and UHDkit, to push the envelope of what is possible in a software encoder. Both Haivision and MulticoreWare will be demonstrating the latest capabilities of x265 and UHDkit at the NAB show next week.
Haivision to Demonstrate Breakthrough Performance of Live 4K HEVC/H.265 Software Encoding at 2017 NAB Show http://www.haivision.com/news-events...ch265-software |
19th April 2017, 18:31 | #5209 | Link | |
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And because said machines are likely using 32-bit UEFI (the horror), it's practically impossible to upgrade to 64-bit Windows without replacing the computer entirely. You can still run 64-bit Linux distributions on them (with varying levels of difficulty getting it set up right), since EFI mixed mode has been supported in the Linux kernel since version 3.15. Personal anecdote time: I'm typing this post out on one such mini-PC (the Quantum Byte, specifically). It's a perfectly capable little machine for casual encoding or media consumption, or mundane office tasks/web browsing, but it's obviously not going to be used for serious encoding tasks. If I really want to squeeze it for performance and 64-bit usage, I did manage to get 64-bit Ubuntu installed to a USB stick and can boot from that when I need to (but running the OS through a USB 2.0 port is not exactly ideal for speed; probably negates all of the benefits 64-bit would've gotten me). It runs on the Atom Z3735F Bay Trail-T/Silvermont platform, so extrapolate whatever speed estimates you can there. It's good enough to bide my time until Coffee Lake arrives and I build something to replace the ancient Coppermine tower I'd been using as my main setup before I got the Byte. Provided Coffee Lake has AVX-512, anyway; there's been conflicting reports about that. |
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19th April 2017, 18:38 | #5210 | Link | |
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Though the main reason 32-bit 7 is on there is because the TV tuner cards in it don't have a driver that works with 64-bit except 64-bit Vista. Anyway, can anyone explain when SSIM RD setting is used? Sometimes it kicks in when changing only that setting, and sometimes the file size remains the same. It says it's only used on certain presets. Does x265 have to have a preset selected for SSIM RD to be used at all? Last edited by Dclose; 19th April 2017 at 18:41. |
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19th April 2017, 19:55 | #5212 | Link | |||
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--rd 3 is enabled in --preset medium and higher. See here (referenced as rdlevel). ssim-rd is slower, so it definitely wouldn't make sense to use below --preset medium. I'd guess it wouldn't be a decent speed/quality tradeoff until at least --preset slower. |
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19th April 2017, 21:18 | #5213 | Link |
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@BenWaggoner
Based on the name of the paramter --ssim-rd, could one infer this should only be used for SSIM and PSNR tests? Do you feel --ssim-rd is worth using? Last edited by brumsky; 19th April 2017 at 21:31. Reason: Typo |
19th April 2017, 21:22 | #5214 | Link | |||
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Using 10-bit x265 is when a huge difference is seen. Around 75% slower. Quote:
The paragraph for SSIM RDO says SSIM RDO is only used on presets which use RDO 3 and above. Since presets can change, I've been leaving it on None and set everything manually. I wouldn't think a particular setting requires a preset to be used even when set manually, but when the description says "It only has effect on presets... --rd 3 and above," I raise an eyebrow and wonder. And speaking of SSIM RDO, I don't know if it has better quality from months ago, but it seems like it. |
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19th April 2017, 21:26 | #5215 | Link | ||
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It uses SSIM as a more advanced rate distortion metric than the default, taking longer but ideally improving perceptual quality. Quote:
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19th April 2017, 21:33 | #5216 | Link | |
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Thanks, I'll test it with my preferred settings and go from there. |
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19th April 2017, 21:44 | #5217 | Link | ||
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1. Default is disabled. (== --no-ssid-rd) 2. It's not bound to having explicitly set any preset. |
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19th April 2017, 21:46 | #5218 | Link | |
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Has anyone else run into this? |
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19th April 2017, 22:06 | #5219 | Link |
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Yes, psy rd is set to 0.0 when ssim-rd is turned on.
If you want to compare quality encode to same bitrate using 2pass encoding. Not surprising if something that uses 55% less bitrate looks worse. No knowledge to be gained from that. |
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