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+--- Thread: [PROBLEM] No sound with bluetooth input after adding codec (/showthread.php?tid=4246)
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RE: No sound with bluetooth input after adding codec - Tim Curtis - 10-02-2021
Lip sync compensation typically has to be done in the source player via some option to set +/- audio delay in milliseconds. I've never seen it done in the Bluetooth receiving device.
RE: No sound with bluetooth input after adding codec - TheOldPresbyope - 10-02-2021
@harrypulvirenti
So I built the AAC and aptX/aptX-HD codecs and rebuilt bluez-alsa (aka bluealsa).
The result works with either my Apple iPad or my Android Pixel 3A as BT source and Pi Headphone jack as MPD output device. This on an RPi4B running moOde 7.4.1 and using onboard BT transceiver.
In the case of the Pixel 3A,
Code:
pi@rpi4b2:~ $ bluealsa -h
...
Available BT profiles:
- a2dp-source Advanced Audio Source (aptX-HD, aptX, AAC, SBC)
- a2dp-sink Advanced Audio Sink (aptX-HD, aptX, AAC, SBC)
pi@rpi4b2:~ $ sudo bluealsa-aplay -L
bluealsa:SRV=org.bluealsa,DEV=58:CB:52:90:F0:74,PROFILE=a2dp
Pixel 3a, phone, capture
A2DP (aptX-HD): S24_LE 2 channels 48000 HzAs you can see, the Pixel and moOde negotiated the aptX-HD codec.
At this point, I don't know what is causing your issue.
Regards,
Kent
PS - You didn't say if your lip-sync problem is audio-lead or audio-lag. I'm supposing you're experiencing audio-lag and hoping that using one of these "advanced" BT audio codecs might result in less of a lag. Since they are implemented in software I suspect this is a vain hope. If the audio lags the video, then the usual solution is to retard the video on the source side.