Trying to understand and steer WinFF preset parameters

[brassplyer]

I have a 31 minute video I need to be slightly under 500 megs. Using WinFF, here's a preset line for Xvid fullscreen

-f avi -r 29.97 -vcodec libxvid -vtag XVID -s 640x480 -aspect 4:3 -maxrate 1800k -b 1500k -qmin 3 -qmax 5 -bufsize 4096 -mbd 2 -bf 2 -acodec libmp3lame -ar 48000 -ab 192k -ac 2


Some of the commands are obvious - the audio sample rate, sample rate and number of channels. What's not as clear to me is how to tell it what video bitrate I want to limit it to. What are the functions of these parameters?

-maxrate 1800k

-b 1500k

-qmin 3

-qmax 5

-mbd 2

-bf 2


Thanks for all assistance.

[Baldrick]

"-b 1500k" is the average video bitrate(1500kbit/s). Lower it to get lower file size. You can use a bitrate calculate to calcualte the exact output file size.

[brassplyer]

"-b 1500k" is the average video bitrate(1500kbit/s). Lower it to get lower file size. You can use a bitrate calculate to calcualte the exact output file size.

Doesn't seem to matter what I set it at, I keep getting a file with a much higher bitrate than what I specify and over the target size. I've changed both the -maxrate and -b. -maxrate at 1200 -b at 1000 - when processed it comes up with around 2800 kbs.

Is there more to it than just altering the parameters in the FFMpeg tab?

[Baldrick]

It's probably the -qmin 3 -qmax 5. Try remove it and see how it works and looks.

See https://forum.videohelp.com/threads/274941-Question-about-Qmin-and-Qmax-settings-%28VOB-to-Xvid%29