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22nd October 2019, 16:59 | #1 | Link |
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Join Date: Aug 2008
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Does CPU Usage 105-110% while encoding x264 affect quality?
Hi every one!
I have system with 2 Xeon CPU which total 24 cores (48 threads) When i use megui (only 1 worker,) encode 2 pass mode with x264(input source 1080p and output 1080p) , pass 1 only get around 20-25% CPU usage, pass 2 get around 33-40% CPU usage So i always using 3 workers at the same time (3 instances, i meant). So pass 1 reach to 75% CPU, and pass 2 always 100-110% CPU Usage. And i want to ask is this affect quality? Or may cause some errors at some frames of output video? I use avisynth 2.6 with command Code:
FFVideoSource"pathtovideo" and never use thread=# |
22nd October 2019, 19:21 | #2 | Link | ||
RipBot264 author
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Quote:
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22nd October 2019, 19:29 | #3 | Link |
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Groucho's Avisynth Stuff |
27th October 2019, 21:33 | #5 | Link |
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Join Date: Jun 2005
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Depends on whether we look at "CPU utilization" or "CPU load".
Be aware: Windows Task Manager and friends show CPU utilization, whereas the "top" or "uptime" commands on Linux/Unix show CPU load.
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5th November 2019, 02:18 | #6 | Link |
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More encodes won't affect quality one bit, but you may want to limit the number of threads for each x264 instance since that will have a minor effect on quality. I believe each x264 instance will be trying to use 72 threads on your system (default is 1.5*logical processors) and they obviously don't scale to that.
On a 2P 12 core/24 thread CPU system I'd personally run two 12 thread encodes pinned on each CPU. (four simultaneous encodes) |
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