Loopback Audio Confusion Advanced users sometimes attempt to record system sound by selecting a "loopback" or "what U hear" option. You must ensure that the setting to record system sound is explicitly enabled in the preferences or the start recording interface before you begin the capture.
Fix Screen Recording Sound Missing: Configure Audio Input and Settings
Verifying the Recording Software Configuration Different screen recorders handle audio differently, and a misconfiguration specific to the software is a prime suspect. Selecting the Correct Audio Input Source Screen recording software usually provides a dropdown menu to choose the audio source.
A frequent error is selecting the wrong input, such as picking an external microphone that is not connected or a system output that captures playback audio rather than the raw sound data intended for capture. If the system microphone access is blocked at this level, the recording software is effectively deaf.
Fix Screen Recording Sound Missing by Configuring Audio Settings
Operating systems often have separate volume sliders for the system and individual applications. Some applications default to recording only microphone audio, while others are set to capture system audio.
More About Why is my screen recording not playing sound
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