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I am building an application where the sound needs to be over the 3.5mm jack and video over HDMI.
However, sometimes it does send the sound over HDMI and 3.5mm jack. And sometimes it just uses HDMI only.
How can I force the sound always goes over 3.5mm jack (I do not care if the sound gets duplicated over HDMI, I will turn of the TV sound)?
Thankyou, Rick
use rasp-config to force sound in 3.5 jack. To do so use below commannd
sudo raspi-config
and then select
9 Advanced Options Configure advanced settings
and then select
A9 Audio Force audio out through HDMI or 3.5mm jack
and finally
1 Force 3.5mm ('headphone') jack
1 System Options -> S2 Audio.
For those looking to achieve the same result from the command line, here is the extract from the documentation:
COMMAND LINE
The following command, entered in the command line, will switch the audio output to HDMI:
amixer cset numid=3 2Here the output is being set to 2, which is HDMI. Setting the output to 1 switches to analogue (headphone jack). The default setting is 0 which is automatic.
For Raspberry Pi 4, an update to @rajesh6115's answer:
use rasp-config to force sound in 3.5 jack. To do so use below commannd
sudo raspi-config
and then select
1 System Options Configure system settings
and then select
S2 Audio Select audio out through HDMI or 3.5mm jack
and finally
1 Headphones
hdmi_driveandhdmi_groupsettings for/boot/config.txt. I haven't tested or looked into this, but at a guess, using DMT may exclude the sound from HDMI (andhdmi_drive=1definitely will), which may mean it goes out via the headphone jack.