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9th November 2005, 06:04 | #1 | Link |
developer wannabe
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Constant quant or equivalent for compressability test?
With Xvid I'd test compressability using constant quant=3 or similar. What is an equivalent setting I could use with x264? The final encodes will use Sharktooth's HQ-Slower/Slowest presets but I want to see what effect various filtering methods have.
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9th November 2005, 07:09 | #2 | Link |
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From a vague memory, x264 quant 18 = xvid quant 2.
Keeping in mind that x264 default constant quant setting is 26 vs xvid default of 4. Personally I think quant 26 is to much compression, and would run the compression test at quant 24 first pass, with a 100% quality "so to speak" second bitrate run.
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http://www.7-zip.org/ Last edited by Audionut; 10th November 2005 at 01:13. Reason: Corrected xvid default quant. |
10th November 2005, 00:10 | #4 | Link | |
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Quote:
bis besser, T0B1A5
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10th November 2005, 01:18 | #5 | Link |
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Thinking about it, a --crf # run would probably be the best bet as far as a compressability test is concerned.
Say Joe likes the quality of --crf 23. So he runs a small test at that setting. Finds the resulting bitrate. Encodes his clip, 2 pass at the resulting bitrate.
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10th November 2005, 01:30 | #6 | Link | |
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Quote:
edit: just specify --pass 1 in the --crf run bis besser, T0B1A5
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10th November 2005, 07:29 | #7 | Link |
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I'd have to add my support to the --crf switch (with --pass 1, as Tobias pointed out). This is why I wanted the --crf switch in the first place .
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