[mythtv-users] Calling for testers...

Steven Adeff adeffs.mythtv at gmail.com
Wed May 12 20:13:49 UTC 2010

On Wed, May 12, 2010 at 12:13 PM, Jean-Yves Avenard <jyavenard at gmail.com> wrote:
> Hi there..
> You may or may not be aware of some of the new features planned for 0.24
> One of them is a new audio architecture...
> I'll pass on the details on what exactly changed from a technical
> point of view, instead only focusing on what's new from a user point
> of view..
> Obviously new:
> -High-Def audio support (that is > 16 bits), including in mythmusic
> -7.1 speak configuration
> -multichannel LPCM support (for 5.1 and 7.1)
> -Multichannel audio properly plays on stereo system (Dolby PLII compatible)
> -7.1 and 5.1 HD audio can be streamed as 5.1 AC3 when your amplifier
> doesn't support it (real-time transcoding)
> -Full PulseAudio support
> Several fixes:
> -Improved AVSync
> -Hopefully no more buffer (or far less) buffer underrun errors
> -dozens more
> For multi-channels analog users, you'll need to go in the Setup ->
> General -> Audio, and check the "PCM support".
> For people using HDMI digital and with a receiver supporting
> multichannel LPCM, same as above, check "PCM support".
> 5.1 and 7.1 Audio will be transmitted as LPCM instead of being
> re-encoded to AC3.
> This is unfortunately required as there's no way to tell if an audio
> output is digital or analog, nor can we detect the capabilities of
> your audio receiver.
> Note for PulseAudio users: we haven't been able to fully identified
> where exactly the problem is, but there are times you get static.
> It seems linked to some bugs in the pulseaudio default resampler. You
> can configure which resampler pulseaudio will use, if you experience
> static, try with a different resampler.
> Other option is to change the default sampling rate pulse is using
> from 44.1kHz to 48kHz.
> (check /etc/pulse/daemon.conf default-sample-rate = 48000)
> How to get it:
> svn co http://svn.mythtv.org/svn/branches/mythtv-hdaudio
> This branch closely follows trunk...
> Report bugs in trac, make sure you select the "Mythtv - Audio Output" componet.
> Thanks in advance
> Jean-Yves

Great work JYA! I've been watching the commits and am glad to see the
audio system get such an overhaul, hopefully I'll be able to play all
my HD audio through Myth soon (HDTracks.com). Seeing as this is for
trunk, I assume it won't work with a 0.23-fixes backend?

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