Had a weird issue tonight where OBS kept crashing when trying to stream to YT. I couldn't figure out what was causing it, and then I noticed the log mentioned ffmpeg. I realized that I recently changed my audio encoder from ffmpeg PCM 32-bit float to ffmpeg ALAC. So I changed it back to PCM and that fixed the problem.
OBS (Open Broadcaster Software) is free and open source software for video recording and live streaming. Stream to Twitch, YouTube and many other providers or record your own videos with high quality H264 / AAC encoding.