[MPlayer-users] A plea for LFE-help

[Luis.F.Correia]

> On Friday, Dec 12, 2003, at 11:06 Europe/Stockholm, Luis.F.Correia 
> wrote:
> 
> > I just don't get it.
> >
> > On a 2.0 system all you can have is two channels, nothing more.
> 
> Of course. But let's agree about one thing - if I have a 
> 5.1-track, it 
> will need to be downmixed to be played on my 2.0 system, 
> right? I want 
> to be able to control how this downmix is being done, which channels 
> that should be used in the downmix. LFE is currently left out when I 
> play dvds.

After reading this response, i DO understand your problem now.
However I'm not sure that it is possible to do it. 
But maybe something along these lines will do, choose '-channels 6' and then
using the '-af' filters, try to route the needed soundtracks to the first
two channels.

The FM may help you a bit...


> 
> > The LFE channel from a DVD sound track has extremely low-range 
> > frequencies,
> > that if routed through normal speakers, can cause serious damage.
> 
> As I wrote in my post, both WinDVD and PowerDVD for windows has these 
> features and I have tried them with my loudspeakers. On 5.1 
> movies with 
> lots of bass information in the LFE-channel the difference in sound 
> experience was huge comparing with playback without LFE! My subwoofer 
> had no problems to deal with the low-range frequencis - but I guess 
> some systems would and that is why LFE is left out as an option in 
> other DVD-players.
> 
> > If you do have a 2.1 speaker set (two satelites and a Bass box), the
> > case is the same, the amplifier on the Bass Box will route the 
> > high-range
> > frequencies to the satelites and the low-range to the Bass 
> box speaker.
> > So I simply cannot understand all the fuss!
> 
> The problem is that the signal that comes out from my soundcard does 
> not contain all bass that is included in the movie 
> soundtrack! On some 
> movies (tried with X-Men and Monsters Inc.) special effects like 
> explosions are only in the LFE which means that these effects sounds 
> very thin when I play movies in mplayer. If I do it in Windows with 
> PowerDVD and enable to include the LFE, the sound is just like I want 
> it - more like a real 5.1 system! However I will soon throw away my 
> PC/Windows so I would hope that some movie player for linux could do 
> the LFE trick.
> 
> Is my problem still unclear?
> 
> Kind regards,
> Jacob
> 
> 
> >>
> >> However, I am not able to get this working. The manual feels
> >> insufficient on it's descriptions - or maybe my computer doesn't do
> >> what it is supposed to do. Therefor I hope that maybe 
> someone of you
> >> out there knows how to master the pan- and channels audiofilter to
> >> solve my problem. People tell me that WinDVD and PowerDVD 
> in Windows
> >> does the LFE-trick, but I would never use Windows, and I 
> am convinced
> >> that mplayer can do it!
> >>
> >> My hardware is a PowerBook G4 with Gentoo Linux and 
> mplayer1.0-pre2.
> >>
> >> Thank you for your time and help!
> >>
> >> Regards,
> >> Jacob
> >>
> >> _______________________________________________
> >> RTFM!!!  http://www.MPlayerHQ.hu/DOCS
> >> Search:  http://www.MPlayerHQ.hu/cgi-bin/htsearch
> >> http://mplayerhq.hu/mailman/listinfo/mplayer-users
> >>
> >
> > _______________________________________________
> > RTFM!!!  http://www.MPlayerHQ.hu/DOCS
> > Search:  http://www.MPlayerHQ.hu/cgi-bin/htsearch
> > http://mplayerhq.hu/mailman/listinfo/mplayer-users
> >
> >
> --
> Jacob Jovelou
> Katedralskolan in Uppsala
> +46 730 774347
> 
> _______________________________________________
> RTFM!!!  http://www.MPlayerHQ.hu/DOCS
> Search:  http://www.MPlayerHQ.hu/cgi-bin/htsearch
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>