divx -> mpeg1 desirable bitrate?

[sunmanking]

Hello,

If you were going to convert a divx to mpeg1,
what bitrate would you use considering that:

1. the source divx is e.g. 720*560
2. the source divx bitrate is e.g. 800
1. the final mpeg1 will be 352*288

?

The cd-r may well be 80min, 90min, 99min.

Would you use the very same bitrate?
Would you use a higher bitrate? Maybe a waste
of encoding time since it will not improve quality?
Would you use a lower bitrate? Why?...

And always taking into account that we're
striving to get the best quality, within our
possibilities.

Thank you in advance!

sunmanking

[RabidDog]

WHoa ! the bit rate for a divx movie has nothing to do with the bitrate used for a vcd or svcd. The easiest thing to do is tyr it with the std settings and see how that goes. If you feel adventurous try upping the bitrate to say 1300 for better quality. Check your players specs in the table to see what sort of things it can handle. If the audio on the divx file is only 128k keep the mp2 audio at the same rate. With std vcd you can confidently predict 10mb for every 1min ergo you can fit 700mb on a 650mb cd (yes!) 800mb on an 80min CDr etc. If you lower the bitrate you will fit more on the CDR but you will lose quality on the high action scenes.

[sunmanking]

Hi,

Thanks for your reply. One of my cocerns was if bitrates
are related or not. So, you've made it clear to me. Thanks.

Yes, I can up the bitrate without any problem. I've already
made 2200 kbs xvcd overburning a 99min cd-r and playing
it on my dvd player with no problem From the reports,
I've also read it can support up to 5000 kbs, so that's
way ahead. So upping the bitrate is not a problem to me
at all. Lowering either.

If I had a 1500 kbs I'd try to upper it maybe, but what
with 660 Kbs or even with cartoons 390 kbs??? That is a
real low bitrate...

Have you faced this before? What approaches have
you taken?

I was thinking of using tmpenc preview but I don't
know whether it'll work when I try the different bitrates...
I'll give it a go.

Looking forward to hearing your comments,

Thank you very much in advance,

sunmanking

[RabidDog]

:P not really too sure that going that far (5000) above the std (1150) would really result in extra quality. I would have thought maybe on an xvcd 1600-1700 would be about the best you can go without really severely wasting bitrates. Obviuosly tho if you can go higher and fit it on a 99min cdr then you might as well... eg fill up the Cd as there is no reason not to. Good luck with the 99min Cdr. Have you tried these in your DVD player, or anyones elses player??

[Gazorgan]

Side Note: That resolution of DivX has a bitrate that's too low, don't expect too much. However, going to VCD (versus SVCD) should hide most of the problems.

[sunmanking]

hi,

finally i've decided to waste lots of bits and maximize
the bitrate to fill an 80min cd-r.

i've encoded at about 2200 kbps...

btw, i've tried these 99min cd-r's in my standalone
dvd player (brand new) and in a friend of mine's
(which is about three years old). both: great
results!

greetings,

sunmanking