[MEncoder-users] losing 5.1 audio on -oac copy transcode

Dan Shoup deshoup at hotmail.com
Mon Sep 22 14:17:10 CEST 2008

I did not realize that.  I did some "listening tests" and my transcoded file played with no options in mplayer (or played in GBPVR or VLC media player) comes mostly through the center channel with a little on the back speakers...but it is the just quality periodic noises, definitely not 5.1.  If I play it on mplayer with -afm hwac3 -channels 6 I hear lots of very realistic sound on the back speakers.  So I can not say for sure whether my receiver is truly producing 5.1 as it indicates, but it is a big step up in sound quality so I'm pretty sure it is.  Any other thoughts?

> From: scowl at pacifier.com> To: mencoder-users at mplayerhq.hu> Date: Sat, 20 Sep 2008 08:49:25 -0700> Subject: Re: [MEncoder-users] losing 5.1 audio on -oac copy transcode> > On Fri, 2008-09-19 at 19:33 -0500, Dan Shoup wrote:> > Anyhow, I tried this and I get the same result...the 51 audio is there, but no player seems to recognize it by default. I can only get 5.1 audio played back if I force mplayer using afm hwac3 -channels 6 and I have no way to force this in GBPVR (my preferred video player).> > How do you know for certain that DD 5.1 audio is there? What players> have you tried it on? > > Some receivers will lie and say they're playing 5.1 audio when they> aren't which sounds likely since you're using hwac3. We see this> confusion all the time when people declare their receivers "smarter"> than others because they see 5.1 audio when more truthful receivers> "can't".> > If the AC3 packets aren't tagged with 5.1 then these players/receivers> are lying about the audio they're seeing and mplayer is simply telling> you the truth.> > _______________________________________________> MEncoder-users mailing list> MEncoder-users at mplayerhq.hu> https://lists.mplayerhq.hu/mailman/listinfo/mencoder-users
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