Choice basic setting Present+tune value or many value setting for X264

This couple of settings: "--vbv-bufsize 1800 --vbv-maxrate 1800" look quite strange to me, since why the hell would you use CRF - but at the same time restrict it to 1800 kbps. Unless you strictly need 1.8-2.1 Mbps, I'd suggest just messing around a bit with the crf value. Though depending on the source (loads of fast motion isn't healthy for low sizes) you may need to go as far down (up, heh) as --crf 25.xx. Though that's for a tricky case like aliased FPS gameplay footage. You may also want to try the internal "--nr" noise reduction, it's pretty good. (I haven't found it destructive (even on 1000 o_O), but what do I know, haha.) By the way, --no-dct-decimate is a Quality for Size option. (blahblah It increases the video size.)

Thanks sneaker_ger and Bloax for help. Yes, I want want host a streaming site with CBR bitrate, ~ 1,8-2Mbps (Video+Audio) with the best possible quality. Do your can help me make tut for this ? Because I try second comanline in bat auto file but can't output file.

May be I get think wrong . So, I only want limit bitrate video streaming no feak than 2Mbps . I try vbv calculator link when set : Frame Rate (fps) :25 Video ABR (kbps):2Mbps Peak Duration (sec): 1 vbv-maxrate=2Mbps vbv-bufsize=2Mbps Results: Allows a peak bitrate of 4000 kbps for 1.00 second(s) with a vbv buffer length of 1.00 second(s). It mean if I setting like that output video will get feak 4 Mbps when streaming. This right? Many thank for help .

I have trouble understanding your post, but to put it simple: --vbv-maxrate sets the fillrate of the buffer. This should be set to the connection speed of the user (minus a bit safety). So you'd set it to 2000 if your user has a 3 Mbit/s connection for example. --vbv-bufsize controls the size of the buffer. As you have correctly found out, if --vbv-bufsize == --vbv-maxrate (disregarding units...), then the buffer is 1 second long. This means that the user will have to wait no more than 1 second before playback can start. You might want to set this a bit higher than 1 second, e.g. 3 seconds. (3 x 2000 = 6000)

Thank so much sneaker_ger. I can clear , so easy with your guide.