Streaming to YouTube: Video OK, Audio volume very low


New Member
Yesterday I tried streaming to my YouTube channel using OBS 25.0.8 on my MacBook Pro running Catalina (10.15.7). The input source comes from an SDI output port on an AJA Ki-Pro recorder. The SDI video/audio is converted to USB 3.0 with an SDTNOVA capture device; it appears in macOS and OBS as "xVideo" and "xAudio".

I did a one-minute streaming test to my YouTube channel. In the resulting video (, the picture is OK but in order to hear the recording I must maximize the playback volume.

I'd appreciate any suggestions about how to fix this -- to stream with sufficient volume.