I wanted to record only audio with OBS Studio. So I have created a new scene and added just Audio Capture Device (ALSA). Then I clicked on the Start recording...button. It recorded both screen and audio. So another time, I tried to replace ALSA with PulseAudio, but it went to the same result. So how can I record just audio via OBS Studio?
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To record only audio in OBS Studio, go to File -> Settings -> Output, make sure Advanced mode is selected. Open Recording tab and choose Custom Output (FFmpeg) in dropdown. Choose e.g. mp3 as container, disable Video encoder and edit the rest of settings to suit your needs.
This will save the output to .mp3 directly and you can use a separate profile for that in case you're also using OBS for normal video recording.
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