How to Merge Audio and Video with FFmpeg (CLI and API)

Originally published at ffmpeg-micro.com You have a video file and a separate audio file. Maybe it's an AI voiceover you generated with ElevenLabs. Maybe it's a podcast intro you recorded separately. Either way, you need to combine them into one file, and FFmpeg is the tool that does it. The problem? FFmpeg's muxing syntax is confusing. You need -map , -shortest , codec flags, and a server to run it on. If you're building this into an app or automation, you also need to figure out scaling, error