Re: [xine-user] Problem in starting Xine

[Michael R. <mr...@us...>]

Hi,

> Hey if I may butt in with a question,
> I apologise if this is off-topic, please forgive me.
>
> Is this why I cannot store a 720Mb mpeg file on a 700 MB cd
> *but* I *can* vcdimage an mpg file into bin/cue and burn it
> and get the whole movie?

As Miguel wrote earlier, the sector format of 'normal' data CDs and VCDs 
is different. The raw sector size of a CD as seen by the OS is 2352 
Byte. I have just looked up the layouts:
Normal data CDs use the mode 1 sector layout:
  12 byte sync
   4 byte header
2048 byte user data
   4 byte EDC (error detection code, CRC algorithm)
   8 byte reserved
 276 byte ECC (error correction code, I suspect some kind of parity)
Therefore you have 2048 byte of usable data in each sector.

Video CDs use the CD/XA Mode 2 Form 2 sector layout:
  12 byte sync
   4 byte header
   8 byte subheader
2324 byte user data
   4 byte EDC
You have 2324 byte of usable data in each sector.

Therefore a VCD can store 13% more data on the same physical disc.
The setback is: you lose one layer of error correction.

Michael

-- 
printk("Penguin %d is stuck in the bottle.\n", i);
	2.0.38 /usr/src/linux/arch/sparc/kernel/smp.c