What does the bitrate affect ?

[Stisse]

Hi,

What difference has the bitrate on my VCD/SVCD ?

Are there some tool to split a SVCD/mpeg to fit perfect on a 80 min CD ?

THX.
/Stisse...

[esby]

vcd is video cd , it can contain mpeg-1 stream with a resolution of 352*240
and you will be able normally to pack in one vcd of 74min
74min of mpeg1 stream ( dont matter about the size of the mpeg)

svcd is similar but it is mpeg2 stream.
the means higher quality and resolution ( eg: 480*480 for a 4/3 ratio)
but you may be able to put near 50 min max one a 74min.

if you want more technical info about vcd and svcd format
you should check these links:

http://www.video2cd.co.uk/about.html
and svcd spec : http://www.pcphotovideo.com/newpage21.htm
esby

[Stisse]

Does it affect the filesize ?

/Stisse...

[esby]

well according to http://www.afterdawn.com/glossary/terms/svcd.cfm
you may be able to reduce bitrate to 74 min of video,
but i never tryed it ( i dont do svcd personnaly i convert these to divx ususally
(for 4/3 svcd i mean)
but i think that cutting mpeg2 stream could be performed by tmpgEnc
( in advanced functions , file cutter/merger tools).

for more info on svcd & bitrate you should try to ask on the related forum i think
( or try a google search for +svcd +bitrate +encode or something like that )

esby

[wmansir]

Bitrate affects how much data is used per second to encode the video or audio. The more data the better the video will look, but the bigger the file will be.

For vcd you cannot change the bitrate without going out of specs, which means your DVD player may not play it correctly. The specs for SVCD allow you to have variable bitrate, so you can adjust the bitrate depending on your quality vs. filesize perferences.

Because of hardware limitations there is a limit on the bitrate of SVCDs. By specs, this is 2600kbps for video and audio combined. Some players can handle more than this, but a player must be able to handle up to this bitrate to be in specs.

For a tool that can splice (s)vcds by filesize, checkout avi2mpg2/bbMPG, here at doom9, or at vcdhelp.com. both sites have good tutorials on how to splice. TmpegEnc can also cut-n-splice, but I find it crashes or produces garbage too much for me. Also, I don't think it can automaticly cut by filesize, just by time.