ED Nurse
Posts: 11
Joined: Tue Mar 06, 2012 10:11 am

HDMI and Sound

Mon Jul 30, 2012 8:12 pm

I have Raspbian as my OS. I am connected to a Samsung 32" LCD TV via an HDMI.

I have successfully modified config.txt to set up the display as 720p and made the necessary changes to force audio output to HDMI (hdmi_drive=2).


After manually typing the line to set the mixer output to HDMI

sudo amixer cset numid=3 2

If I select the Front_Center file to be output, there is a clicking followed by part of word, this is more apparent if I select Noise.wav, there is a period of clicks followed by 'white' noise.


If I change the audio output destination to be the analogue with headphones by

sudo amixer cset numid=3 1

then I get the complete sentence from Front_Center or the complete 'white' noise.

However there is no sound from Scratch.

dom
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 5502
Joined: Wed Aug 17, 2011 7:41 pm
Location: Cambridge

Re: HDMI and Sound

Mon Jul 30, 2012 8:20 pm

I think there has been a firmware fix since Raspbian/Wheezy for the start of HDMI audio being lost. Can you try an update:
http://elinux.org/R-Pi_Troubleshooting# ... g_firmware

FX4
Posts: 64
Joined: Fri Jul 27, 2012 2:39 pm

Re: HDMI and Sound

Mon Jul 30, 2012 8:33 pm

I tried the update and I still see the same problem on one of my televisions. I think the audio still has some work to go.

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