2008-02-07, 13:30 | Link #1 |
AFX ADDiCT
Fansubber
Join Date: Jul 2006
Location: Portugal
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2-pass or 3-pass encode?
I've been wondering wich is better and I've got some topics that I need someone to explain:
- Does 3-pass makes the video lose compressibility? - Does it make lose quality? - When should I use 3-pass? - What does the 3th-pass do? Thanks in advance.
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2008-02-07, 13:47 | Link #2 |
makes no files now
Join Date: May 2006
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Generally there is very little difference 3 and 2 passes from what I know. 3-pass might be useful if you are encoding a very short clip (think in seconds). Searching Doom9 for "pass" or similar keywords gives pretty interesting results, so I'd go for that if you need more detailed information.
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2008-02-07, 14:23 | Link #3 |
x264 Developer
Join Date: Feb 2008
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- Does 3-pass makes the video lose compressibility?
- Does it make lose quality? - When should I use 3-pass? - What does the 3th-pass do? 1. No. 2. No. 3. When you have too much time on your hands and don't care about wasting time for little real benefit. 4. Not much. 3-pass doesn't actually help bitrate distribution get much more precise, at least with x264; it makes it more accurate on really long videos, but on really short ones it still doesn't fix the problem of inaccurate target bitrates. Summary: Don't bother. |
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