[mythtv-users] dvd iso playback problem

[Dan Littlejohn]

On Tue, Apr 30, 2013 at 11:26 AM, Richard <peper03 at yahoo.com> wrote:

> On 28/04/13 20:49, Dan Littlejohn wrote:
>
>>
>>  <snip>
>
>
>  Now most of my dvd isos will play, I still have 1/2 dozen that won't
>> although the failure is different (these play fine in xine).  I wonder
>> if it is related.  This is the log from trying to play one of those
>> (with the loopback MTU set to 16k)
>>
>
> <snip>
>
> Hi Dan,
>
>
>  2013-04-28 13:33:03.765665 E [2698/2894] Decoder
>> DVD/dvdringbuffer.cpp:521 (safe_read) - DVDRB: Failed to read block:
>> Error reading NAV packet.
>>
>
> This error seems to indicate that there was an issue with the data from
> the image.  The library MythTV uses (libdvdnav) to parse the DVD data is
> reporting that a data structure it was expecting wasn't found (or was
> corrupt).  One reason for this could be using encrypted ISOs in storage
> groups across the network, but you said your images were all decrypted so
> unless one has slipped through the net, it shouldn't be that.
>
> If the data has been corrupted, it poses the question why the image plays
> in other applications (to my knowledge, most use the same library, although
> possibly with their own modifications).  One reason may be that some
> applications attempt to skip the menu and jump straight to the main
> feature.  That could well mean that they're not seeing the corrupted data
> if it's part of the menu.
>
> You could try starting the frontend with '-v playback --loglevel=debug'.
>  That will certainly give more data (although not from libdvdnav).
>
> Are you getting the same problem from the other images that won't play?
>
> Richard.
>
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>

For anyone else having tthe problem of some dvd ISOs not playing in myth,
but working in other players I was able to fix it and keep the iso format.
What I finally figured out is that you can use the program "dvd-shrink" to
re-author the disk (non-compressed) to create a new iso container.  All the
movies I was having problems with were fixed by doing this.  Just thought I
would pass that along as keeping a single iso file for a movie is really
convenient and I like the myth interface better than the other players I am
using.

Dan
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