[mythtv-commits] Ticket #7426: Static noise from 96kHz/24bit audio files in MythMusic

MythTV mythtv at cvs.mythtv.org
Mon Oct 26 22:36:02 UTC 2009

#7426: Static noise from 96kHz/24bit audio files in MythMusic
 Reporter:  Paul Hooper <paul.a.hooper@…>          |       Owner:  stuartm       
     Type:  defect                                 |      Status:  infoneeded_new
 Priority:  minor                                  |   Milestone:  0.22          
Component:  MythTV - Audio Output                  |     Version:  0.22rc1       
 Severity:  medium                                 |     Mlocked:  0             

Comment(by Paul Hooper <paul.a.hooper@…>):

 Thanks for the reply, sample attached. I was wrong about the right channel
 being fine in my original post, the audio is there but it is stretched
 (played back at approx. half speed). Left channel is just static.

 I had a quick look at the myth ALSA audio output code and I can see the
 max supported rate is 48kHz. There seems to be some code for dealing with
 24bit sample format and endianness. aplay deals with 24 bit audio using
 blocks of three bytes. You guys know all this anyway. My C++ has gone from
 rusty to practically non existent over the last few years, so I'm a bit
 out of my depth here.

 16/20/24-bit and 44.1k/48k/96k/192kHz sample rate support is included with
 many realtek ICs, even those on cheap motherboards like mine! I'm guessing
 this is because of new codecs like Dolby TrueHD and DTS-HD using these
 rates and formats. Are there any existing plans to support these new

Ticket URL: <http://svn.mythtv.org/trac/ticket/7426#comment:3>
MythTV <http://www.mythtv.org/>

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