[mythtv-commits] Ticket #5900: AO: Generalise upmix and AC-3 encoding

[MythTV]

#5900: AO: Generalise upmix and AC-3 encoding
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 Reporter:  foobum at gmail.com  |        Owner:  ijr    
     Type:  patch             |       Status:  new    
 Priority:  minor             |    Milestone:  unknown
Component:  mythtv            |      Version:  head   
 Severity:  medium            |   Resolution:         
  Mlocked:  0                 |  
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Comment(by davatar at comcast.net):

 Replying to [comment:29 foobum at gmail.com]:
 > Replying to [comment:26 davatar at comcast.net]:
 > > Correction to the above, the patch mostly works as long as the "max
 channels" is set to 5.1, then all sound is 5.1 AC3 encoded. However I get
 digital clipping and (no volume control) when getting upmix from analog TV
 recordings.
 >
 > The timestretched, stereo AC-3 'issue' is intended behaviour on the
 basis that there's no point reencoding stereo material. You should have a
 valid default device defined (even if it's the the same as the passthru
 device). I might change this.
 >
 > I've never experienced any clipping - could you provide a sample and
 some logs?
 Nothing is logged for this and I don't know how to save the AC3 output
 stream. Source was analog stereo capture, I simply turned down the capture
 volume.

 Also there is a point to re-encoding (or passing through) stereo material
 properly - if stereo material is always output to 5.1 AC3, then the sound
 system's dolby prologic decoding is defeated. This would work if stereo
 PCM or stereo AC3 streams were output as stereo AC3 and not 5.1, unless
 the prologic decoding can be done in software on the upmix???

-- 
Ticket URL: <http://svn.mythtv.org/trac/ticket/5900#comment:31>
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