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19th March 2011, 06:40 | #1 | Link |
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Join Date: Mar 2011
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Bitrate mode better?
Among qp,crf,bitrate mode,which is better to use?
I don't know the difference in ripping result between qp and crf,who can tell me? I think bitrate can control all the options,it can give the best ripping result,it can be even changed toward qp mode,is that right? As for presets,under qp or crf mode,is it that change the persets can only lower the bitrate but not improve quality? Another question about anime deblocking in rapid scene, dark scene and fade scene, I met a lot of block and increase bitrate/deblocking,psy rf,trellis doesn't help.It seems increasing Adaptive quantizer reduced the block,why? |
19th March 2011, 12:04 | #2 | Link |
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Join Date: May 2006
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If you need a known size, use 2-pass bitrate, otherwise crf. Do not use qp. 2-pass and crf will give you the same quality at the same bitrate.
Presets change the the quality/bits. So when using crf the exact visual quality can be affected by your choice of preset. The general suggestion for animation is to lower psy-related values. Try --tune animation.
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19th March 2011, 12:05 | #3 | Link | ||||
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CQP is rarely a good idea, but otherwise it depends on what you are targeting. CRF is good for maintaining constant quality across a number of encodes. 2-pass lets you pick a target file size.
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2nd April 2011, 11:59 | #5 | Link |
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What? If you use mb-tree, it will choose the pb-ratio for you. Otherwise, don't change it.
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6th April 2011, 18:21 | #6 | Link | |
The Black Reaper
Join Date: Nov 2009
Posts: 320
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http://www.mplayerhq.hu/DOCS/HTML/en...feat-x264.html
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If so, does that means that 2-pass > crf any time? I remember reading a post by DS that states that an encoded output of the same size by x264 from the same source has the same quality regardless if it is encoded using 2-pass or crf assuming both uses the same encoding settings. Can someone verify if the documentation of mplayerhq is valid? |
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6th April 2011, 18:29 | #7 | Link |
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The text is valid if you are aiming for a specific bitrate/filesize. It's pretty clear that they are not talking about CRF anyway, because the problems described in the second paragraph are not applicable to it.
Last edited by nurbs; 6th April 2011 at 18:33. |
6th April 2011, 18:35 | #8 | Link |
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That section refers to one-pass ABR encoding. Not to one-pass CRF encoding.
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deblock, quality, x264 |
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