[MPlayer-users] mplayer & VCD

Jean-Yves Simon lethalwp at tiscali.be
Wed Sep 3 13:31:10 CEST 2003

On Tue, 2003-09-02 at 23:39, harold knibbe wrote:

As D R Felker said in a previous mail, you may not move files from a
read only media. Instead, you may be tempted to copy them, don't do this
from a vcd, it will result in a unusable mpeg, why? Because of the vcd
format itself:

Normal data cds are written in blocks of 2048 bytes + CRC data
VCDs are written in raw mode, which means 2336 bytes per block are used
for the video+audio, no crc, any degradation of the cd will result in
video and/or audio degradation. But this allows you to write 800MB on a
CD of 700MB of normal data.

> > With "mplayer vcd://2 /dev/cdrom /dev/hdc" I play a movie from a VCD 
> > (mpg file)
> > (this CD cannot be mounted)
> > But, I can save the output in a identical mpg file, on my hard disk ?
> > 
> I had some time and you had a very interesting problem, so I have given
> a try.
> Here you have some results.
> [root at test /]# mount mnt/cdrom
> mount: /dev/cdrom already mounted or /mnt/cdrom busy
> mount: according to mtab, /dev/cdrom is already mounted on /mnt/cdrom
> [root at test /]# eject
> [root at test /]# mount mnt/cdrom
> [root at test /]# ls mnt/cdrom
> ext  mpegav  segment  vcd
> [root at test /]# mv /mnt/cdrom /home/h.knibbe/data
> mv: reading `/mnt/cdrom/mpegav/_z0000.mpg': Invoer-/uitvoerfout
> [root at test /]# mv /mnt/cdrom/ext /home/h.knibbe/data
> mv: cannot remove `/mnt/cdrom/ext': Alleen-lezen bestandssysteem
> [root at test /]#
> You see it´s Dutch and it says mv: cannot remove bla bla bla and then
> ¨Only-read filesystem¨.
> I'm not a very experienced user, i saw also another mail. I would say
> try your luck again by someone else,but I give you fifty % change.

Jean-Yves Simon <lethalwp at tiscali.be>

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