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BrainwreckedTech

Member

Registered: 2011-10-03

Posts: 1

CSS weirdness with dd, dvdbackup, and mplayer -- Can someone explain?

Just wondering if someone could explain what's going on in the following circumstance.  This doesn't happen for all CSS-encumbered DVDs, but I can reproduce the pattern for DVDs that it does happen to.

dd if=/dev/sr0 of=~/somefile bs=2048

dd cuts off with an error at around the 4MB mark.

mplayer -dvd-device /dev/sr0 -identify -frames 0
dd if=/dev/sr0 of=~/somefile bs=2048

dd now completes

mplayer -dvd-device ~/somefile dvd://n

the video is messed up

dvdbackup -i /dev/sr0 -o ~/somedir -n somename -M
mplayer -dvd-device ~/somedir/somename dvd://n

the video is still messed up

mplayer -dvd-device /dev/sr0 dvd://n -frames 60

This seems to be the magic trick

dvdbackup -i /dev/sr0 -o ~/somedir -n somename -M
mplayer -dvd-device ~/somedir/somename dvd://n

Now works.

dd if=/dev/sr0 of=~/somefile bs=2048
mplayer -dvd-device ~/somefile dvd://n

Still messed up.

Last edited by BrainwreckedTech (2011-10-03 17:43:32)