hi,
is mg meaning MB?
never mind...
...
so, if your source file is PAL or NTSC which is in resolution 720(768) x 576 lines...reduce it to half(i mean if you want)...
then frame rate is 25(pal) or 30(NTSC) you can reduce a bit;-) like 15 FPS(frames per second)but it depends on your material(if it is kinda toon look or more graphical video you can reduce it to 15fps, then again if it is more organic;-) real people, lots of movement you go with higher Frame Rate)...and the codec which is a key for good picture...use mpeg-4, or h.264 and always use multipass option(if you want, i mean;-.)
...
about the sound:
use less compression on sound...use higher bitrate watever compressor u use...
sound is low in bandwith.Why? people can tolerate bad picture prior to bad sound...
...
as i recall youtube has its own directions for encoding videos for it...RTFM ,heh
hope it helps
m.