FFMPEG 2pass command in php

first of all plz tell me What is 2pass command in FFMPEG?

2nd...plz giv me an example of a basic 2 pass command of ffmpeg for PHP script.

tnx in advance

 

2pass command ?? dunno well u need ffmpeg-php installed

See commands list http://www.catswhocode.com/blog/19-ffmpeg-commands-for-all-needs

 

no. u dont need ffmpeg-php for 2pass. ffmpeg-php is different thing.
all i need to know what is 2pass & how it works?
tnx for the link but those are 1pass command...i asked for some 2pass command !!

 

http://forum.videohelp.com/topic251008.html