[mythtv-users] Preserve AC3 while Transcoding` HD Resordings

Kevin Kuphal kkuphal at gmail.com
Mon Feb 9 19:52:22 UTC 2009

On Mon, Feb 9, 2009 at 12:57 PM, Chris Everest <chriseverest at gmail.com>wrote:

> Hello fine MythTV users...  Here's my setup.  I use HD Homerun to record
> clear QAM on my mythbackend.  So we know we're starting with MPEG+AC3
> source.  I then do a 'light' transcode using the builtin mythtranscode
> jobs.  I preserve the "HD" resolution by transcoding to 1280x720, but use a
> lower bitrate so that it still looks decent on the big screen, but also
> still plays well on my SD frontends (Athlon 2800+).
> Here's the deal.
> I love the AC3 sound. I have full dolby digital in the main media room.
> However, when I choose the audio portion of my transcode job, I specify
> "Uncompressed" and "48000" on the sample rate.  Unfortunately, this
> transcodes it to something other than AC3 because I no longer get dolby
> digital, instead I get the old style Pro Logic spec on the receiver.
> Bummer.
> Do I need to use Project X?  Or start using the "Other Jobs" to get what I
> want?

The short answer is yes.  MythTV internal transcoding will not preserve AC3
and the audio that you did with "Uncompressed" is uncompressed PCM data

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