Audio Capabilities of RecDual Dongle¶
RecDual Dongle offers versatile audio recording capabilities, supporting embedded audio from video sources and external audio input through the AUX port.
Audio Specifications¶
Audio Encoding: AAC
Sample Rate: 48kHz
Bitrate: 192Kbps
Channels: Stereo (2.0)
Audio Sources¶
HDMI Audio
Audio embedded in the HDMI signal is automatically recorded
No additional configuration needed
Supports stereo audio from any HDMI source
Type-C DP Audio
Audio is automatically captured through the DisplayPort signal
Device system audio is embedded in the recording
Stereo output recorded to video file
AUX Input (3.5mm)
3.5mm TRRS (4-pole) jack
Dual-function port:
Microphone Input: Connect external microphone for commentary
Line Output: Connect headphones for audio monitoring
AUX Port Features¶
The AUX IN port supports multiple use cases:
As Microphone Input
Connect a 3.5mm microphone to add voice commentary
Microphone audio is mixed with source audio in the recording
Ideal for:
Game commentary
Tutorial narration
Presentation voiceovers
As Line Output
Connect headphones to monitor audio during recording
Hear the source audio while recording
Essential when recording from Type-C DP (device speaker is disabled)
Headset with Microphone
A headset with built-in microphone can provide both functions
Monitor audio while adding commentary
Use standard TRRS (4-pole) headset
Important: Type-C DP Audio Behavior¶
When recording from a mobile device via Type-C DP:
Warning
Type-C DP takes over the device’s audio output channel.
The device’s built-in speaker will not work
This is normal behavior, not a malfunction
Audio is still being recorded to the video file
How to hear audio during Type-C DP recording:
AUX Port: Connect headphones to the RecDual Dongle’s AUX port
HDMI Passthrough: Connect the HDMI OUT to a TV or monitor with speakers
Tip
If you need to hear audio while recording from your phone, always have headphones ready to connect to the AUX port.
Audio Recording Tips¶
For Best Audio Quality:
Use the source device’s audio at moderate volume levels
Avoid audio clipping by not setting volume too high
For microphone recording, use a quality external microphone
For Commentary Recording:
Position microphone at appropriate distance
Test audio levels before starting important recordings
Consider using a headset for simultaneous monitoring and commentary
For Music or Media:
Ensure source audio is not muted
Check that audio is routing through HDMI or Type-C DP
Some apps may require specific audio output settings
Limitations¶
No support for surround sound (stereo only)
Cannot record phone call audio through Type-C DP
Built-in microphone not included - external mic required for commentary