> I should have mentioned that the resulting iso plays only partially,
> that is: it (meaning VLC, mplayer, ffplay) play only the intro and stop.

Right, I’m guessing there are a lot of 0’s in there, I bet if you gzip that 
file it’ll turn out to be a lot smaller than the 4.7, 8.6GB or something you’d 
expect.


> # isoinfo -d dev=/dev/sr0
> CD-ROM is in ISO 9660 format

…
> NO Joliet present
> **BAD RRVERSION (0)
> NO Rock Ridge present


> Once I mount the drive:
> # mount -t iso9660 /dev/sr0 /sr0
> mount: /dev/sr0 is write-protected, mounting read-only


So I think you might have a udf only dvd mounted as iso9660.


> Was there an mp4 compression used such that the driver
> performs a conversion to VOB before handing over the data to
> the user process??? Just curious!!!

No, I think we can be pretty sure nothing like that is happening especially 
since that user process is dd...
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