Singler line FFMPEG cmd to Merge Video /Audio and retain both audios

Question

I have a project that requires merging of a video file with another audio file. The expected out put is an video file that will have both the audio from actual video and the me

Answer 1

You can not do that using one cmd.

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1. Get the audio from video file, the audio file name is a.mp3

ffmpeg.exe -i video.mp4 a.mp3

2. Merge two audio files(audio.mp3+a.mp3=audiofinal.mp3)

ffmpeg.exe -i audio.mp3 -i a.mp3 -filter_complex amerge -c:a libmp3lame -q:a 4 audiofinal.mp3

3. Merge video file and audio file(video.mp4+audiofinal.mp3=output.mp4)

ffmpeg.exe -i video.mp4 -i audiofinal.mp3 -map 0:v -map 1:a -c copy -y output.mp4