[mythtvnz] No Sound & Black screen lockup in mythfrontend 0.24

[Jean-Yves Avenard]

Hi

On 24 November 2010 06:58, Brett <mythicalbeast at slingshot.co.nz> wrote:
> There are many JYA posts/replies in the forums that indicate it is
> important to rescan the audio devices (after 0.24 upgrade) even if you
> type in your own device definition.

As I explained there.

The scan for audio device button has two purposes.

First it scans the audio devices available on your system (Alsa,
Pulse, OSS, Jack)
Then it check the entry you've typed manually if it isn't found in the
list detected above.

In most cases, the typical user scenario would be:
Go in the settings -> general -> audio
Press the scan audio device.
Then select the one you are using. Configure the options such as what
speaker configuration you are using (Stereo, 5.1, 7.1) ; if you want
upmixed stereo to 5.1 .

2nd scenario: if you don't see your device or you think you know
better ; you can enter in the audio device field your own entry. The
instant you enter something manually, everything is reset and you can
modify everything as you wish. Set AC3 or DTS passthrough, 7.1 etc...
irrelevant to what the audio device actually support, nor if the audio
device actually exists or isn't usable.

If you press Scan Audio Devices once again, and a custom device has
been entered, myth will scan once again for all the devices found on
your system, then will scan the custom entry and see if it's usable.
If the device can't be opened (doesn't exist or is in use) you'll see
a window stating "Audio device isn't usable".

If myth can open it, it will also query how many channels it supports,
if it's an analog or digital device, what format and sample rates are
supported. Then it will update accordingly all the settings boxes.

So if your device reports that only stereo is supported, 5.1 and 7.1
is removed from the list. If your device is an analog one, then it
won't display AC3 and DTS checkbox etc...

Now that last step of pressing Scan Audio Device isn't compulsory, but
it is strongly recommended because myth will tell you right away if
there are problems with it.

When upgrading from 0.23, you do not have to go into the audio
settings and reconfigure. It's just the recommended approach to make
sure everything is right.

If you are upgrading from 0.23 and earlier to 0.24-fixes SVN revision
27334 or later, in most cases an existing audio configuration that
used to work, will continue to do so as backward compatibility was
greatly improved in MythTV revision 27334.

Hope this helps.

JY