OBS merging audio to video file

[bphan6]

Hello Community,
Need your help. I want to edit the MP4 video with background music. I have setup the OBS to play the MP4 video and add another one playing MP3 music. For some reason I do not have the music combined with audio and it like static noise. If I disable the MP4 audio, I can hear music. If I disable the MP3 then I can have clear sound from MP4. Please help.
thanks

 

[koala]

OBS isn't the right tool for this. To modify existing videos, use appropriate postprocessing tools. To edit and postprocess audio only, use a tool specialized for audio processing, such as Audacity. It seems you also want to add some spoken commentary with your mic, that's possible with Audacity as well.