Bugs item #1583303, was opened at 2006-10-24 10:54
Message generated for change (Comment added) made by tcwan
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Category: tv
Group: None
>Status: Open
Resolution: Fixed
Priority: 5
Private: No
Submitted By: TC Wan (tcwan)
Assigned to: Nobody/Anonymous (nobody)
Summary: MPLAYER_AO_DEV doesn't work with Alsa hw device settings
Initial Comment:
For TV viewing using an analog TV Capture card
(SAA7134), setting MPLAYER_AO_DEV to
'alsa:adevice=hw.1,0' doesn't enable the DMA audio for
TV playback using mplayer.
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>Comment By: TC Wan (tcwan)
Date: 2006-10-27 10:02
Message:
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Tested working on r-8476. Both live TV and recording works
as expected using DMA sound.
However, now I have a new problem. If I leave Line In
plugged in, both the analog line in audio and the DMA sound
will be mux'ed. How do I mute the Line In for TV viewing
only? (VCR_CMD has a muting pre and post command).
I still have the analog Line In due to radio. DMA sound
isn't reliable at this point (I get buffer underruns).
In addition, arecord|aplay doesn't have any volume gain
adjustment unlike sox, but sox still doesn't work for me for
radio playback.
----------------------------------------------------------------------
Comment By: Duncan Webb (duncanwebb)
Date: 2006-10-24 15:45
Message:
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This is a special case for tv audio. There are two alsa tv
sound modules in the kernel, saa7134-alsa and cx88-alsa.
A new group_type 'tvalsa' has been added to VIDEO_GROUPS
that will allow the adev settings to be included in the
mplayer command.
The existing groups_types are:
normal
dvb
ivtv
webcam
The best way to explain this is with an example, here are
settings in local_conf.py:
# mplayer is fussy about having -ao alsa+params and -tv
alsa:adevice+params so set
MPLAYER_AO_DEV = 'alsa'
The changes to a VideoGroup are:
# video groups
VIDEO_GROUPS = [
VideoGroup(vdev = '/dev/video0',
adev =
'alsa:adevice=hw.1,0:amode=1:audiorate=32000:forceaudio:volume=100:immediatemode=0',
input_type = 'tuner',
input_num = 0,
tuner_norm = CONF.tv,
tuner_chanlist = CONF.chanlist,
desc = 'Pinnacle 110i Group',
group_type = 'tvalsa',
record_group = None),
]
I may be necessary to add, so that any other audio settings
are not altered.
CONTROL_ALL_AUDIO = 0
The changes have been applied to rel-1-6 at r8460. Please
test and confirm that it is working.
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