galaxy001
27th November 2005, 11:34
I want to repack some anime Xvid avi to x264. How can I get nearly the same quality ?
Question 1, How to determine the Q value ？
I think I must use Quality-based VBR (nominal QP), because Q value must be equal to the Xvid, am I right ?
So I just followQP(H264) =12.0 + 6.0 * log(qscale/0.85) / log(2.0) = 12.0 +6.0 * log2(qscale/0.85) and should I decrease the x264 Q value by 1 so that it is better ?
I want to get the most small file while keeping the quality.
So these above is about the --crf --qpmin --qpmax ,
and what about --qpstep ? Still, should I keep --qpmin 10 ?
Question 2, How to determine other things?
--trellis , is it useful in repack? In fact, I don't even know when to enable it.
--ref , --bframes , How to choose them wisely ?
mixed_refs, Is it better? I will never choose avi as x264 container, should I use mixed_refs ?
--me umh , is it too much for my purpose ?
--subme 6 --b-rdo , still is it too much ? Which level is better or wiser ?
--no-psnr , I don't think it will be much faster, still, what PSNR is good ? 46?
Would you tell me can I judge a anime by PSNR ? or I should at least get how much of the PSNR ?
--filter <alpha:beta>, if the avi is already sharpened, should I set alpha=1 or more ?
at last, I am using intel Celeron 2.0 with 512M momory. I don't want my x264 video with AAC audio in mp4 or mkv cannot be played smoothly on my PC. So which options I cannot choose ?
Question 1, How to determine the Q value ？
I think I must use Quality-based VBR (nominal QP), because Q value must be equal to the Xvid, am I right ?
So I just followQP(H264) =12.0 + 6.0 * log(qscale/0.85) / log(2.0) = 12.0 +6.0 * log2(qscale/0.85) and should I decrease the x264 Q value by 1 so that it is better ?
I want to get the most small file while keeping the quality.
So these above is about the --crf --qpmin --qpmax ,
and what about --qpstep ? Still, should I keep --qpmin 10 ?
Question 2, How to determine other things?
--trellis , is it useful in repack? In fact, I don't even know when to enable it.
--ref , --bframes , How to choose them wisely ?
mixed_refs, Is it better? I will never choose avi as x264 container, should I use mixed_refs ?
--me umh , is it too much for my purpose ?
--subme 6 --b-rdo , still is it too much ? Which level is better or wiser ?
--no-psnr , I don't think it will be much faster, still, what PSNR is good ? 46?
Would you tell me can I judge a anime by PSNR ? or I should at least get how much of the PSNR ?
--filter <alpha:beta>, if the avi is already sharpened, should I set alpha=1 or more ?
at last, I am using intel Celeron 2.0 with 512M momory. I don't want my x264 video with AAC audio in mp4 or mkv cannot be played smoothly on my PC. So which options I cannot choose ?