[mythtv] DVD dropping back to the frontend at the menu. PCM_DVD problem?

Paul Harrison mythtv at sky.com
Thu Nov 22 13:46:16 UTC 2012

On 21/11/12 14:17, Neil Salstrom wrote:
> On Wed, Nov 21, 2012 at 6:00 AM, Paul Harrison <mythtv at sky.com> wrote:
>> I'm seeing something similar in master as well except there it causes a
>> segfault. The problem seems to be the audio is detected as having 0
>> channels. Do you know roughly when you first noticed this problem so I can
>> narrow down which commit broke things?
>> Paul H.
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>> mythtv-dev mailing list
>> mythtv-dev at mythtv.org
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> Hi Paul,
> I noticed it somewhere around the 6th or 7th of November.
> Unfortunately for me it's not a case of it working before and then
> seeing some sort of regression.  I had never tried those disks before
> that time.  If you think you've got a solution I'd happily apply some
> patches this weekend on my 0.26-fixes system.
> Thanks,
> Neil


I have a workaround that you could try that at least allows the problem 
DVDs to play for me but it could be considered a bit of a hack.

I've tested this in master and haven't seen any problems. The code in 
0.26fixes is slightly different but I don't think there is anything that 
should top this working assuming you are seeing the same problem as me 
of cause.

In this file 
comment out lines 2131 to 2133 and add a continue; at the end so that 
section of code looks like this:-

if (open_val < 0)
         QString("Could not open codec 0x%1, id(%2) type(%3) "
                 "aborting. reason %4").arg((uint64_t)enc,0,16)
     //av_close_input_file(ic); // causes segfault
     //ic = NULL;
     //scanerror = -1;

Does anyone know why ScanStreams() stops the scan at this point rather 
than continuing on to find a valid stream? ic is used after it is set to 
NULL here so at the very least a NULL check need to be added to line 
2208 in master to prevent a segfault.

Paul H.

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