Welcome to Doom9's Forum, THE in-place to be for everyone interested in DVD conversion.

Before you start posting please read the forum rules. By posting to this forum you agree to abide by the rules.

 

Go Back   Doom9's Forum > Video Encoding > MPEG-4 AVC / H.264

 
 
Thread Tools Search this Thread Display Modes
Prev Previous Post   Next Post Next
Old 31st December 2009, 06:49   #21  |  Link
Dark Shikari
x264 developer
 
Dark Shikari's Avatar
 
Join Date: Sep 2005
Posts: 8,667
Quote:
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.
Quote:
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.
Dark Shikari is offline   Reply With Quote
 

Tags
2 pass, realtime, x264

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +1. The time now is 11:41.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2022, vBulletin Solutions Inc.