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Re: [MPlayer-users] mplayer TV tuner interface problems

To: "MPlayer user's list." <mplayer-users@xxxxxxxxxxxx>
Subject: Re: [MPlayer-users] mplayer TV tuner interface problems
From: Jindrich Makovicka <makovick@xxxxxxxxxxxxxxxxxxxx>
Date: Mon, 10 Nov 2003 12:21:29 +0100
In-reply-to: <20031110095441.GG15472@astral.ro>
References: <20031110095441.GG15472@astral.ro>
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6a) Gecko/20031029 
[Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
Catalin Muresan wrote:
[Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]

Hello,

        I have a bt878 tv tuner that i use with mplayer, the only problem i
have is trying to adjust the volume. First my system specs: duron 650, 256mb
ram, geforce2mx, bt878a tv card, sblive (emu10k), bt878a card connected to
sblive on line port.
        mplayer works fine but because the tv is linked with a cable from
the tv card to the soundcard it will not enable any audio driver so i cannot
control the volume and because of this i tried 2 things:

you can use aumix,gmix/gnome-volume-control or similar utility to adjust line-in volume.

        1. first i tried to use immediatemode=0 so mplayer would get the
audio from bt878 and play it to the soundcard, works but with a very
significant drop in framerate, now i have like 5fps and mplayer already said
"your system is too slow etc." while i checked with vmstat system is always
above 80% idle.

there are some issues with immediatemode=0, so I generally don't recommend using it.

        2. i hacked the libao2/ao_oss.c part of the mplayer and i added a
-mixer-channel so i can control not the PCM but the LINE channel of the
mixer, which did not work because mplayer on tv mode does not use the audio
output drivers. i tried to fool mplayer with -audiofile, worked but mplayer
crashes when changing channels then.

        also a smaller issue, video is delayed line 200ms (maybe because i
use -vf pp=lb ?)

there can be a small delay because the audio goes directly to the soundcard, while video has to be processed/buffered.

you can also try using tvtime (tvtime.sf.net), which is specialized for real time tv watching.

Regards,

--
Jindrich Makovicka

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