CBR or VBR for tv episodes

[jbarman]

Hello,

I'm converting Star Trek episodes (~40 minutes) to SVCD. I can fit a whole episode on one CD with a constant video bitrate of 2350 and audio at 192. I'm happy with the quality and speed (in CCE). My question is: is there anything to gain, quality-wise from doing multipass? It's going to increase the encode time a bunch, and I don't care about getting a smaller file, as it already fits on one cd.

[Robbins1940]

Well I used video bitrate of 2245 varible and 224 audio in realtime mpeg2 480x576 and it looks no difference from broadcast tv. The file is usaully around 43mins and 30sec but the above bitrate will fit a cdr80 upto 44mins.

David

[rickmccl]

vbr only has the potential of saving space. If it allows TWO episodes per cd then it has given you something; but it does not sound like it will allow for that.

[jwhitlow]

<TABLE BORDER=0 ALIGN=CENTER WIDTH=85%><TR><TD><font size=-1>Quote:</font><HR size=1 color=black></TD></TR><TR><TD><FONT SIZE=-1><BLOCKQUOTE>
On 2001-11-29 07:17:25, rickmccl wrote:
vbr only has the potential of saving space.
</BLOCKQUOTE></FONT></TD></TR><TR><TD><HR size=1 color=black></TD></TR></TABLE>
2-pass VBR actually does a little bit more than save space. If you set a CBR bitrate of 1500, you will have 1500 all the way through. Scenes needing less than 1500 will have excess, but won't benefit from it. Scenes needing more than 1500 will suffer. If you use 2-pass VBR at 1500, it runs through the video twice. During the 1st pass it looks at how many bits each scene needs & then 'steals' bits from low motion scenes and gives then to high motion scenes while still giving you the same file size as the 1500 CBR.