How much extra space does authoring take on disk ?

[VideoBoy]

Has anyone been keeping track of this (those who use VCDImager, I-Author or VCD Toolkit) ?

If I have an MPEG that will fully occupy a 650 MB disk (let's say full 74 min approx.) After I author a VCD with this MPEG and a bunch of menus and chapters, will I still be able to fit the final image on a 650MB DIsk ? Or will I need bigger disk than 650 MB ?

[T-rad]

Chances are u will need a bigger disk
Although u can fit 745mb of media on a 650 & 795 on a 700 most authoring systems take 15% for overhead, on a full 700mb mpeg this is about 100mb. This means the original mpeg should be no larger than the disc u intend yo write to
the more menus etc, the bigger u make the file...
I have only used I-Author for svcd's but i found that it & ezcd creator have lower overhead. I've been able to fit 50min compliant svcd on a 700mb disc with I-Author.
If I-Author is the same for vcd, it will most likely fit on a 650 (but i am unsure)

hope this helps

[adam]

Overhead for vcds is maybe about 5MB's, for svcds its more like 10MB's. Add this to the SIZE of your mpg, do not worry about playtime, its irrelavent.

Now add the size of all your .bmp files to this. If its less than 740MB's it will fit on a regular cdr, if its less than 800MB's then it will fit on an 80 min cdr.

Chapters will not take up any extra space, well not nearly enough to even worry about.

The answer to your question is that it depends on how many menu's you have and how large the .bmp files are. If all together they are less than ~20MB's you could probably overburn them.

[T-rad]

adam what ru athoring with ???
no matter what i use to author with the cue/bin is always about 100mb bigger than the original mpeg file

[VideoBoy]

Thanks folks.

It sounds like different authoring programs may have differetn amount of overheads for same functionality. I have a 116 min movie (Crouching Tiger Hidden Dragon. 116 min after removing end credits and other unnecessary parts at the begining). After encoding at 1450 kb video + 224 audio I get about 1420 MB so 710MB per disk. I guess I should not have any problem authoring each disk with about 9 entry points and 9 pictures (one for each entry point).



_________________
I wanna bust Blockbuster

<font size=-1>[ This Message was edited by: VideoBoy on 2001-09-04 11:02:01 ]</font>

[T-rad]

VCDImager no matter what GUI I use (TSCV0.722, VCDImagerGUI 0.7.10, VCDIMagerEASY 0.9.6, VCD2XML 0.02) on a 704mb mpeg I get an 810mb.bin file. VCD Composer crashes, Nero is 806mb, EZCD Platinum 5.0 on a 492mb mpeg I get an 495mb.cif file & I-Author i'm still working on.
All of these have no cdi or menu's
These are all done on svcd's, but everything I've done has a 100mb overhead

[kinneera]

Something is wrong with your setup, but it's not clear what. Myself (and I think the majority of people) find that there is minimal overhead for VCDs and SVCDs (certainly not 100MB), including when using VCDImager. The mux rate of your MPEGs might be wrong...or something to that effect.

[hvr]

let's talk numbers;

(1 sector = 2352bytes RAW MODE2 or 2336byte MIXED MODE2, depending on the image type used)

when using vcdimager; the first iso track takes at least 300 sectors;
for SVCDs this may grow slightly, depending on how big the scan data files get (of which the size depends on the playing time of the mpeg streams!) and how many other files you add; also segment items increase the first tracks size;

***
then comes a 150 sector pre-gap (unless its size has been changed by an option value)

(optional front margin -- set to 0 sectors by default for SVCDs)

and then comes the actual MPEG data; where each 2324byte MPEG pack corresponds to one sector; unless your MPEG streams needs padding; then less bytes than 2324 may correspond to a sector...

(optional rear margin -- set to 0 sectors by default for SVCDs)

repeat from *** for each track

(optional lead out pause -- set to 0 sectors by default)


so, if your SVCD's have an overhead of 100MB, then it's most probable that your MPEG streams required heavy padding (not to be confused with something phonetically similiar ...

nero allows you to have odd packsizes; thus creating unaligned MPEG sectors on the disc (which are 0% compliant with any (S)VCD spec); but vcdimager does not tolerate this and tries to autopadd them...

[Greg12]

i author vcds with nero and i've gotten like 770megs on cd.


my nero seems to decide how much space based on playtime.

[adam]

People, disk images contain more info than just what is going to be burnt onto the disk. A 700 MB mpeg will get about 5MB's or so of overhead added to it during authoring, for vcd that is. The disk image might be over 800 MB's but when you burn it there will only be about 705 MB's on the disk.

Don't worry about the size of the disk image, just add up what you know is actually GOING on the disk.