[mythtv-users] No input sound on PVR-250

John OKeefe 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
 have
 
 PVR-250 with DirectTV satellite TV-Out COAX connected
 to the COAX in on the PVR-250.
 VIA AC97 sound out connected to headphones.
 P4 1.4Ghz
 Elite P4VMXS motherboard
 1GB ram
 
 These are the steps I have tried to resolve the
 problem: 
 
 (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
 board audio. 
 (2) I ran alsamixer and made sure that all channels
 had volume and that none of the channels had MM (mute)
 above them. 
 (3) I ran mythtv-setup and tried all the different
 sound processor options i.e. dsp, dsp0, dsp1, dsp2,
 and dsp3. 
 (4) I tried test_ioctl and made sure that volume was
 65000 and mute was 0. 
 (5) I tried the following: 
 
 Code: 
 
 cd /usr/src 
 # The ivtv compile needs the src files. 
 tar xvfj linux-2.4.25-chw.tar.bz2 
 
 cd /usr/local/lib/ivtv/driver 
 make clean 
 # I suppose I could have used "make install" but I was
 testing 
 # and didn"t want to add to my problems. 
 make 
 
 cp msp3400.o
 /lib/modules/2.4.25-chw/kernel/drivers/media/video/ 
 # And answer yes to overwrite the existing file. 
  
 I tried mplayer /dev/video0
 
 When I played Mplayer I noticed the following two
 items displayed:
 
 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
 or not.
 
 Is there anyway to check and see what dsp my PVR-250
 is using i.e. dsp, dsp0, dsp1, etc. without having to
 guess? 
 
 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
 do.
 
 Best Regards, 
 John
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mythtv.org/pipermail/mythtv-users/attachments/20040621/0ac80e5f/attachment.html


More information about the mythtv-users mailing list