[mythtv-users] DVD ISO playback problems: Invalid IFO

[Joe Ripley]

On Jan 9, 2008 2:43 PM, kim Gross <kgross at jensalt.com> wrote:
> >> k9copy is what I normally use.  It is able to copy many DVDs that mythvideo
> >> cannot.  But is cannot handle the latest Macromedia DRM stuff.
> >>
> >>
> >
> I would be willing to bet you are hitting deliberate bad sectors used to
> stop copying of the disc.  Your player will skip over the bad sector
> without to much trouble, but if you try to duplicate or rip the disc the
> software will hang trying to read the data.  Discs like this can take a
> long time to rip because of the time for  retries etc. When I have one I
> just setup dvddecrypter to ignore errors and to only retry errors once.
> Still takes an hour or two to rip because the drive will retry a few
> times before it sends the error to the software.

This is another place where dd_rescue can help.  You can tell
dd_rescue to copy either forwards or in reverse.  If your encountering
bad sectors near the beginning of the disc, just copy in reverse.  It
won't truncate the data (unless you want it to) and you can still read
in the entire ISO.  Granted, reading in reverse is slower than
forward, but still much faster than waiting for the disc to error out
on each sector.

The finished image works just fine for a lot of my DVDs with similar
read errors.

-- 
Joe Ripley
vitaminjoe at gmail.com