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Old 24th April 2023, 15:51   #41  |  Link
excellentswordfight
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Originally Posted by HD MOVIE SOURCE View Post
WOW, seriously? Thats crazy prices. So what is it like encoding on systems like this? Can you encode a 2 hour movie using Placebo on x265 in a day?
First of all, x265 doesnt scale indefinitely with more cores, no advanced GOP-based codecs do so, at somewhat stock threading settings 4k get good utilization to about 16-24C, to improve speed beyond that chunk encoding is a necessity. So for single file encoding a expensive 64C model wont help, it will probably be slower as they have lower clock speed.

I encode at work on a CPU comparable to the 5975WX (32C threadripper), at preset veryslow it gets about 1-1,5fps, and I can do two simultaneously at about 1fps. But even professionally, for production I never go below slower, there just isnt any ROI at that point, and have up to this point yet encountered anyone using something like x265 placebo in production environments, thats just bad business as there are so much diminishing returns at that point. Even if we had hw were the raw throughput was usable, i doubt I would even go to veryslow, slower does indeed already use most of the potential in the encoder. At that point most gains comes from content and compression level specific tuning.

Last edited by excellentswordfight; 24th April 2023 at 16:30.
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Old 24th April 2023, 20:06   #42  |  Link
benwaggoner
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Quote:
Originally Posted by excellentswordfight View Post
First of all, x265 doesnt scale indefinitely with more cores, no advanced GOP-based codecs do so, at somewhat stock threading settings 4k get good utilization to about 16-24C, to improve speed beyond that chunk encoding is a necessity. So for single file encoding a expensive 64C model wont help, it will probably be slower as they have lower clock speed.

I encode at work on a CPU comparable to the 5975WX (32C threadripper), at preset veryslow it gets about 1-1,5fps, and I can do two simultaneously at about 1fps. But even professionally, for production I never go below slower, there just isnt any ROI at that point, and have up to this point yet encountered anyone using something like x265 placebo in production environments, thats just bad business as there are so much diminishing returns at that point. Even if we had hw were the raw throughput was usable, i doubt I would even go to veryslow, slower does indeed already use most of the potential in the encoder. At that point most gains comes from content and compression level specific tuning.
Great points! I pretty much only go above slower for lower bitrates & resolutions that won't be the long pole in encoding an adaptation set, or for test content that needs to be as accurate as possible.

You're absolutely right that most of the quality improvements beyond slower (and maybe beyond medium) come from content or scenario specific tuning. Last night's test encode had a 1033 character command line, 762 just of parameters excluding paths and file names.
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Old 26th April 2023, 22:41   #43  |  Link
Lucius Snow
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I tried x265 (official build) with DEE for Dolby Vision Profile 7 encoding (FEL). I used a Ryzen 3990X (64 cores). That's terribly slow: something like 1 hour for a 5 seconds footage. The CPU usage never exceeded 30%. I couldn't test with znver2 because it doesn't seem to be included in the parameters.
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