I'm trying to backup one of my DVD's. It is from a documental with 2 chapters. Each chapter is less than 4 Gb. When I try to backup one of them with:

lxdvdrip -t=1

then, the next error appear:

[...]
STAT: Processing streamdvd -i /dev/dvd -t 1 -f 1.000000 -s 0xe0,0x80,0x20 |...
libdvdread: Using libdvdcss version 1.2.8 for DVD access

libdvdread: Attempting to retrieve all CSS keys
libdvdread: This can take a _long_ time, please be patient

libdvdread: Get key for /VIDEO_TS/VIDEO_TS.VOB at 0x00000130
libdvdread: Elapsed time 0
libdvdread: Get key for /VIDEO_TS/VTS_01_0.VOB at 0x00002723
libdvdread: Elapsed time 0
libdvdread: Get key for /VIDEO_TS/VTS_01_1.VOB at 0x0000284d
libdvdread: Elapsed time 0
libdvdread: Get key for /VIDEO_TS/VTS_02_0.VOB at 0x003102b5
libdvdread: Elapsed time 0
libdvdread: Get key for /VIDEO_TS/VTS_02_1.VOB at 0x003102ba
libdvdread: Elapsed time 0
libdvdread: Found 2 VTS's
libdvdread: Elapsed time 0
Selected streams: 0xe0 0x80 0x20
Processing title 1, chapter 1 (1888755) - chapter 7 (4)
AV Delay: 0 ms
INFO: [???] mplex version 1.6.1.93 (2.2.3 $Date: 2004/01/13 20:45:26 $)
**ERROR: [???] Unable to read from e0.
STAT: VOBU 0 at 0MB, 1 PGCS

Directory 'VIDEO_TS' not found!
[...]


Other method I try is with DVD::Rip. I rip files to my HDD and then I use dvdauthor to generate DVD format (.IFO and .BUP files) but the next error appear:

[...]
WARN: System header found, but PCI/DSI information is not where expected
(make sure your system header is 18 bytes!)
WARN: Skipping sector, waiting for first VOBU...
WARN: Skipping sector, waiting for first VOBU...
WARN: Skipping sector, waiting for first VOBU...
WARN: Skipping sector, waiting for first VOBU...
WARN: Skipping sector, waiting for first VOBU...
[infinite times]
[...]

How can I do the backup?

TIA
iab