: ffmpeg -i DASH_480.mp4 -i audio.mp4 -c copy -map 0:v:0 -map 1:a:0 output.mp4
DASH is an adaptive bitrate streaming technique that allows high-quality streaming of media content over the Internet delivered from conventional HTTP web servers. DASH_480.mp4
: For advanced users, yt-dlp is the gold standard. It automatically identifies the highest available DASH stream and merges audio/video using FFmpeg. : ffmpeg -i DASH_480