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Old 31st December 2009, 06:49   #21  |  Link
Dark Shikari
x264 developer
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Join Date: Sep 2005
Posts: 8,667
Originally Posted by seanxu_2010 View Post
x264 --profile main --bitrate 800 --vbv-init 0.9 --vbv-maxrate 800 --vbv-bufsize 8000 --me umh --analyse all --qcomp 0.90 --subme 6 --trellis 2 --ref 3 --rc-lookahead 250 -o Estimate_720x576_30fps_NR_max_NRT_max_1.264 Estimate_720x576_30fps_NR_max_NRT_max.yuv 720x576 --fps 30 --psnr --ssim --deblock 0:0 --slices 3

I use VBV to obtain a proper bitrate to accommodate the network. I used ESEyE to observe the size of every frame, I found some B frame used very high bit because of fash lamp, what I expect is when we find it's B frame, and consume an extreme high bits, I will drop it for saving bits for other frame.
x264 intentionally makes them B-frames in order to save bits. It also refuses to trigger a scenecut, saving bits. Furthermore, MB-tree raises the quantizer a ton, saving bits. Of course, you screwed with qcomp, which is probably preventing MB-tree from doing its job. Don't touch it.
Originally Posted by seanxu_2010 View Post
because in the match, we will concentrate on the athletes in the middle slice, and up and down are always audience, we can use higher QP to blue them for saving bits
I don't recall any sports match in which there's an audience on both the top and bottom of the frame, but no, x264 doesn't do that.
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