[mythtv] [mythtv-commits] Ticket #1104: multichannelaudio support

[Paul Catchpole]

Paul Catchpole wrote:
> Mark Spieth wrote:
>   
>>> I've one problem with it, now we've been using it for a few hours - I'm
>>> getting a crackle from the centre speaker which is intermittent although
>>> not random. It varies from a sharp click, to a buzz and is in sync with
>>> the sound on the channel. It has the following characteristics:
>>>
>>> * Master output volume level changes the volume of the click, but
>>> doesn't alter its proportion to the other sounds.
>>> * Changing the centre channel mixer level makes the clicking quieter,
>>> but doesn't alter its proportion to the other sounds on the centre 
>>> channel.
>>>
>>> I'm getting the feeling that it is directly proportional to the quantity
>>> of very low frequency sounds in the source. It was particularly bad
>>> earlier on 'Creature Comforts' and is extremely bad, now and again,
>>> watching [well, my better half is] the X-Factor. Commercials almost
>>> always don't cause it. It does happen on the news channels.
>>>
>>> I know that's perhaps not a lot to go on, but if you've any ideas I'd
>>> appreciate it.
>>>     
>>>       
>> in el_surround.cpp line 74 (setting wnd in loop with sqrt) there is a 0.5 
>> commented out. uncomment it so that the 0.5 factor is included. I suspect 
>> the clicking is float to short conversion issues. this will decrease the 
>> overall gain of the upmixer. let me know if it works for you. everything Ive 
>> tested with shows the current value ok but more testing will prove/disprove 
>> this.
>>
>> mark
>>
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>>   
>>     
> I've made the change - in el_processor.cpp, you meant?
>
> Recompiling now - I'll let you know how I get on.
>
> The clicking is an odd one. Jurassic Park went by with no clicking 
> whatsoever, but Red Dwarf on BBC2 was awful. Odd!
>
> PC
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>   
Been using it all afternoon with no clicking whatsoever. Noticed the 
gain loss though - although it isn't really a problem!

Cheers!

Paul