Linux za Sve forum

lspci -v

06:02.0 Multimedia controller: Philips Semiconductors SAA7130 Video Broadcast Decoder (rev 01)
	Subsystem: Philips Semiconductors Device 0000
	Flags: bus master, medium devsel, latency 64, IRQ 18
	Memory at febffc00 (32-bit, non-prefetchable) [size=1K]
	Capabilities: <access denied>
	Kernel driver in use: saa7134
	Kernel modules: saa7134

You may find that by default TV sound is muted. why so?
here is the answer. That is because of the default behavior of SAA7130 chip. it should be like that
because SAA7130 relies on loop back cable to your sound card. so you are loosing your line-in port for other purposes
to address this problem SAA7130 accepts 2 audio in connections (both sterio). one set of pins for TV audio from the Tuner / IF section.
another is to provide line-in fuctionality.
SAA7130 allows you to connect your actual line-in requiremnts like input from your cassete player
many TV cards do not have line-in ports. but the chip sitting in the card provides that feature. sounds nonsence right?.
So by default SAA7130 connects it line-in input to its passthough output. and TV sound is disconnected.
Now let me tell you the problem you need to rectify. we need to initalize the card with right flags in place to connect its tv audio to its passthough output

So I started my efforts to findout a suitable card number, which can put my cards internal switch to pass the audio from TV to passthough output
it was a furstrating brute force method and spend long hours...many times ended with system reboots..
many times got noice with very low audio in the backgroud...
finally i arived at a card number which can put the right switch for audio. Now i am getting a very clear audio out!

Multimedia controller: Philips Semiconductors SAA7131/SAA7133/SAA7135 Video Broadcast Decoder (rev d1)
Subsystem: Giga-byte Technology Device 9002
Flags: bus master, medium devsel, latency 32, IRQ 17
Memory at dffff000 (32-bit, non-prefetchable) [size=2K]
Capabilities: <access denied>
Kernel driver in use: saa7134
Kernel modules: saa7134

semiRocket je napisao/la: U vezi zvuka, jesi stavio patch kabel iz tv kartice u zvučnu i spojio sve kako treba?

dmesg | grep saa713

ls -l /dev/dsp*

ls -l /dev/video*

#! /bin/bash
# Script to cleanly start and stop tvtime and sound.

sox -t alsa hw:1 -t alsa hw:0
l=`pidof sox`
tvtime
kill $l
unset l
exit 0

#! /bin/bash
# Try to start tvtime and sox sound and stop them cleanly.

#sox -q -V -c 1 -r 32000 -t alsa hw:1 -r 44100 -t alsa hw:0 & #no stereo
sox -q -V -w -s -c 2 -r 32000 -t ossdsp /dev/dsp1 -c 2 -r 44100 -t alsa hw:0 fade 15 & #stereo
tvtime --norm=PAL -b /dev/vbi0 --frequencies=custom --mixer=/dev/mixer:pcm
l=`pidof sox`
kill $l
unset l
exit 0

#!/bin/sh
sox -c 2 -s -w -r 32000 -t ossdsp /dev/dsp1 -t ossdsp -w -r 32000 /dev/dsp &
tvtime --mixer=/dev/mixer:pcm
wait tvtime
t=`pidof sox`;
kill $t;
amixer -c 0 sset PCM 80%,80% unmute