[mythtv-users] No input sound on PVR-250
john at terminalreality.com
Mon Jun 21 16:49:05 EDT 2004
When I try to record a T.V. show or watch Live T.V. in
KnoppMyth R4V4 I hear no sound. Here is the system I
PVR-250 with DirectTV satellite TV-Out COAX connected
to the COAX in on the PVR-250.
VIA AC97 sound out connected to headphones.
Elite P4VMXS motherboard
These are the steps I have tried to resolve the
(1) I played a MP3 to verify it was not my sound out
that was not working. I heard sound, so my sound out
is working great. Sound out is coming from AC97 on
(2) I ran alsamixer and made sure that all channels
had volume and that none of the channels had MM (mute)
(3) I ran mythtv-setup and tried all the different
sound processor options i.e. dsp, dsp0, dsp1, dsp2,
(4) I tried test_ioctl and made sure that volume was
65000 and mute was 0.
(5) I tried the following:
# The ivtv compile needs the src files.
tar xvfj linux-2.4.25-chw.tar.bz2
# I suppose I could have used "make install" but I was
# and didn"t want to add to my problems.
# And answer yes to overwrite the existing file.
I tried mplayer /dev/video0
When I played Mplayer I noticed the following two
MPEG: No audio stream found -> no sound
and later on down
Audio: no sound
I also tried a couple of the following:
test_ioctl -v input=X,output=Y
Where X and Y are numbers that I try differently each
time. I have no clue what numbers to use, what range
of numbers to use, and if I need to reboot each time
Is there anyway to check and see what dsp my PVR-250
is using i.e. dsp, dsp0, dsp1, etc. without having to
Each time I change the dsp using mythtv-setup do I
need to reboot?
How can I verify that there are no other msp3400.o
files and that the right one is loading?
When running Mplayer does the "MPEG: No audio stream
found -> no sound" line give any tips as to what might
be going wrong?
Is there anything else I should try or that I missed
to get sound input working?
Any help would be much appreciated! I am so close to
being able to record shows on my KnoppMyth box.
Also I am a super Linux novice so if you give any
instructions please be detailed as I may not
understand the command to do what you are asking me to
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