[mythtv] [mythtv-commits] Ticket #1104: multi channel audiosupport

Eric Bosch eric.bosch at comcast.net
Thu Jul 12 00:20:27 UTC 2007

I don't know if this has been brought up before, but this sounded like
pretty closely related.  Is there a way to add dynamic compression or
automatic audio volume leveling to give some control over some of those
channels that like to crank the volume up on commercials by about 25

Mark Spieth wrote:
>> No. Just do it yourself in the patch. I'll try to remember it and not to
>> break with the next ffmpeg merge (ac3_sync will move to ac3_parser.c).
> done. there is another patch happening which EdW is testing for me 
> independently using the internal ac3dec.
> still unsure of the channel ordering but I want to make it the same as 
> mplayer's and xine.
> more experimentation required. If someone knows the ordering mplayer uses 
> can they please point me in the right direction.
> currently it is L C R RL RR LFE which means my alsa config needs to do some 
> reordering.
> If you are keen I can send you the current one immediately.
> Im also trying to find a GPL'd 2ch -> 5.1 ch upmixer (not the one in libaf 
> which is too simple).
> Ive sent an email off to aud-x devs so hopefully this can be included soon 
> too.
> Otherwise Ill have to write on and Im not too keen on doing that if I can 
> help it.
>> One question regarding dts-passthrough: Is libdts only needed as codec
>> in libavcodec? If yes, we can get rid of it with the next merge.
>> libavcodec has a native DCA/DTS decoder.
> dts passthorugh requires no codec as its passed through as digital. no 
> external or internal libs required.
> dts transcode to ac3 ((with timestretch) only requires the self contained 
> dtsdec in lavc. I dont believe we need any external dts libs.
> mark 
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