Problem ripping DVD with libdvdread

[tahoward]

I've been having problems ripping DVDs in Fedora 9 with anything that uses libdvdread - particularly dvdrip and mythtv. These errors appear in dmesg:

Buffer I/O error on device sr0, logical block 1107319
sr 1:0:0:0: [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE,SUGGEST_OK
sr 1:0:0:0: [sr0] Sense Key : Medium Error [current]
Info fld=0x21caee
sr 1:0:0:0: [sr0] Add. Sense: Unrecovered read error
end_request: I/O error, dev sr0, sector 8858552
Buffer I/O error on device sr0, logical block 1107319
sr 1:0:0:0: [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE,SUGGEST_OK
sr 1:0:0:0: [sr0] Sense Key : Medium Error [current]
Info fld=0x12eb60
sr 1:0:0:0: [sr0] Add. Sense: Unrecovered read error
end_request: I/O error, dev sr0, sector 4959616
Buffer I/O error on device sr0, logical block 619952
Buffer I/O error on device sr0, logical block 619953
Buffer I/O error on device sr0, logical block 619954

and the applications report an error ripping the dvd. It's very inconsistent - it never happens at the same block twice, and doesn't always happen for a given DVD, although it's more likely to occur with longer DVDs than with shorter ones. I don't think it's hardware related either - it happens on new, unscratched DVDs, and as long as the disc has been "unlocked" with lsdvd or something, dd if=/dev/dvd of=whatever.iso always works. Any idea what may be wrong? I thought about upgrading to a newer Fedora, but the libdvdread version is the same, so I didn't think that would help. Unless it's kernel related... does this sound like a known bug?

[scottro]

I see you still haven't received any answers. (Unfortunately, I can't offer any either.)

I'm wondering if the problem is that you're using Fedora 9, which is, in Fedora terms, just about senile.

Is there any way you could try with a live CD that supports this ripping (either from a USB stick, or if you have a second CD) to see if it's F9 that is the issue, or something else, such as hardware? (I see that you don't think it's hardware related, but one never knows, and that would be a good test.)