Quote:
Originally Posted by LoRd_MuldeR
As far as I know if you create two files of the same size, one with CRF (1-Pass) and one with 2-Pass, then the difference in quality between these two files will be very small. Most likely you wouldn't be able to notice it. The difference is: With 2-Pass you know the final size in advanced, with CRF you don't. But in 2-Pass mode you need to decide for a target average bitrate, which isn't easy, as different sources require different bitrates to look good! In CRF mode you can simply specify a level of quality (very roughly) and the decoder decides the required bitrate for you.
In short: If you are targeting for a certain level quality and you don't care about filesize, then find the highest possible CRF value that still satisfies your eyes and use that CRF value for all your encodes. And if you are targeting for best possible quality for a restricted filesize (e.g. 700 MB for a CD-R or 4,7 GB for a DVD+R) then use 2-Pass mode.
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To make this very, very, clear: they will produce the same quality at the same size, but you don't know what that "same size" is until its done with the CRF encode. Two-pass is just guesswork.