 |
 |
an iDVD MPEG Curiousity
|
|
|
|
|
Fresh-Faced Recruit
Join Date: Nov 2001
Status:
Offline
|
|
Why is it that I can put around 2 hours of MPEG1 compressed video on a Data DVD at 640*480 resolution but I am limited to 90 minutes of MPEG2 video at a "reduced quality" in iDVD2? If anything, I should be able to put nearly twice the amount of MPEG2 video on a DVD than MPEG1.
Any thoughts?
|
|
|
| |
|
|
|
|
|
|
|
Mac Elite
Join Date: Sep 2000
Location: in front of the keyboard
Status:
Offline
|
|
iDVD's MPEG2 is NTSC or PAL which are higher resolution/framerates and the sound compression is different as well.
I just burned a 90 minute DVD and it looks great, don't know how "degraded" it is supposed to be.
|
|
signatures are a waste of bandwidth
especially ones with political tripe in them.
|
| |
|
|
|
|
|
|
|
Fresh-Faced Recruit
Join Date: Apr 2001
Location: Adelaide, SA, Australia
Status:
Offline
|
|
I've never used iDVD, but the MPEG2 codec is not designed to give better compression than MPEG1. Basically, MPEG1 was designed with a max bitrate of 1.5Mbit/s (which is the speed CDs were designed for). MPEG2 was designed to give broadcast quality video without this restriction, hence its use on DVDs. Ain't nothin' to do with getting better compression... although MPEG2 takes advantage of more efficient coding than MPEG1, you'll get a bigger file size simply because with MPEG2 you *can*; up to the max for DVD which from memory is about 11Mbit/s. And you've got sound to worry about, since the audio system for MPEG2 is different from that used in MPEG1.
If iDVD gives you enough control over it, try limiting the bitrate to 1.5Mbit/s. 
jv
|
|
|
| |
|
|
|
|
|
|
|
Fresh-Faced Recruit
Join Date: Nov 2001
Status:
Offline
|
|
Well, thank you for clearing it up for me. It just kinda sucks though, I'm still a little disappointed in the 90minute limit, I've still always be a little curious as to why DVD STudio Pro can do 2 hours rather than 90 minutes but I guess that's a question for later.
Thanks again!
|
|
|
| |
|
|
|
|
|
|
|
Forum Regular
Join Date: Dec 1999
Location: Tulsa, OK, USA
Status:
Offline
|
|
It has to do with the bitrate of the video. iDVD always compressed with the maximum bitrate which makes the video huge and only lets 90 minutes fit onto the DVD but you can choose your bitrate with DVD Studio Pro. With the min bitrate you could fit many hours of video onto a DVD, much more than just 2.
|
|
http://elvisripley.com
|
| |
|
|
|
|
|
|
|
Fresh-Faced Recruit
Join Date: Nov 2001
Status:
Offline
|
|
OK, I understand now. So, if I want good...maybe near broadcast quality DVD's what bit rate range should I be lookin' for? Of course, I'm not including the quality of the video that inputted, let us assume a 3CCD DV Camcorder for a quality base.
Thanks again.
|
|
|
| |
|
|
|
|
|
|
|
| |
|
|
|
 
|
|
|
Forum Rules
|
|
|
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
|
HTML code is Off
|
|
|
|
|
|
|
|
|
|
|
|
|
Top
