VBR for xVCDS?

[hamman]

Should I bother using 2-pass VBR for xVCDs or is it just a waste of time?
And what bitrates should I use? (i want to fit about 60 min on a cd)

[Heavensent]

what resolution do you use?
xvcd is a general name for unstandart vcd, so what is the x for ?
bitrate? resolution? both?

the extra bitrate will only go so far for a certin resolution,
sometimes its better to a lower resolution to get a better picture
at a certin bitrate.

write down the resolution you intend to use and you will get a better
answer...

in general, you will have to use an
everage bitrate of about 1600 to fit 60 min of film on a cd

[hamman]

Sorry i didn't tell you what resolution I use. I use PAL vcd resolution, 352*288.

[scottymac]

I routinely make PAL XVCDs from PAL SVCDs using TMPEG with 2 PassVBR (3000max/2500av/1800min.kbps 480x576 MPEG-1).

The filesize and quality are very close to the original.

However, your player may not be able to handle the non standard MPEG-1 resolution and/or high bitrate. Best to re-encode a short section and burn to a CD-RW.

[Heavensent]

i whould go with vbr
you will see much difference with vbr with high bitrate.
but you can make your own little test and find out for yourself
if its better in your eyes.

[hamman]

Thanks for your replies. I know you save diskspace by using vbr, how much?

[ZippyP.]

I know you save diskspace by using vbr, how much?

You can save disk space if you want, but it depends on your settings for the average bitrate. Your minimum and maximum bitrates set the limits that the encoder must work between and the average controls the file size. All three settings will control the quality of the output. The encoder will use a lower bitrate in low motion scenes and higher rate in high motion scenes, thereby applying bits more efficiently than CBR where the rate is fixed. You can have an average setting lower than an equivalent CBR rate while perserving quality.

Here's a rough rule of thumb from my own experience:

The VBR average can be about 2/3 of the CBR setting for similar quality. So for VCD about 800 avg. and SVCD about 1700 avg. will give good results.Typically, VBR will fit a movie on 2 disks in SVCD while CBR needs 3.

[hamman]

Thanks a lot

[Vejita-sama]

Take a look at:

https://www.videohelp.com/forum/viewtopic.php?t=157572&highlight=vbr+cbr

it's a good past dicussion about CBR vs. VBR, and how both encoding methods work. VBR encodes do not really 'save space' they better to think of VBR as a way to 'get more video on each CDR without losing quaility.'

[hamman]

Thanks