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20th August 2012, 07:39 | #1 | Link |
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Different Settings in 1st and 2nd pass
If i use
Encode 1 1st pass --preset placebo --bitrate 800 2nd pass --preset fast --bitrate 800 Encode 2 Automated 2 pass --preset fast --bitrate 800 Which encode is better quality? Or they're same? Last edited by bxyhxyh; 20th August 2012 at 07:50. |
20th August 2012, 17:32 | #2 | Link | |
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Quote:
So after all, what you'd want is something like: Code:
x264.exe --pass 1 --preset veryslow x264.exe --pass 2 --preset veryslow
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20th August 2012, 17:41 | #3 | Link |
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Sorry my english is not so good. Some questions may not clear.
Code:
x264.exe --pass 1 --preset veryslow --bitrate 800 x264.exe --pass 2 --preset veryfast --bitrate 800 Code:
x264.exe --pass 1 --preset veryfast --bitrate 800 x264.exe --pass 2 --preset veryfast --bitrate 800 Normally i just use veryslow for both passes. Just for knowledge If i use better/worse settings in first pass, it affects quality? Or doesn't? Last edited by bxyhxyh; 20th August 2012 at 17:44. |
20th August 2012, 18:20 | #4 | Link |
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Code:
x264.exe --pass 1 --preset veryslow --bitrate 800 x264.exe --pass 2 --preset veryfast --bitrate 800 |
20th August 2012, 19:01 | #5 | Link |
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Moreover it seems he still tries to slow-down the first pass, compared to the second one - which is the exact opposite of what makes sense.
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20th August 2012, 19:41 | #7 | Link |
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Not if you do not slow down the second pass too.
In fact it will be slightly lower quality as you are using different settings for the first and second passes. As LoRd_MuldeR said: If you do not set --slow-firstpass, pass 1 forces "--preset fast" settings. |
20th August 2012, 20:12 | #8 | Link | |
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Why do you want to slow down first pass and make second pass faster when the main encoding job is done during second pass? The only purpose of first pass is to make rough estimations for second pass. It doesn't make sence to use high quality setting for estimation and use fast, not-so-precise (lower quality) settings for main encoding process. Also:
Quote:
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20th August 2012, 20:59 | #9 | Link |
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The output from the first pass will be discarded anyway, so using slower settings in the first pass is pointless
The one and only thing from the first pass that will survive and is going to be re-used is the "stats" file! All settings that don't effect the "stats" can be lowered safely in order to speed up the first pass! The final video file that you are going to keep is generated only in the second pass. That's why using slower settings in the second pass (and thus faster settings in the first one) does makes sense. (And, as explained before, all this happens automatically in x264, so you don't need to take care of it. Simply use the same Preset for both passes!)
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