Combine Audio and Video with ffmpeg

Discussion

1. Antoni

   There is a Firefox extension for this if anybody prefers UI over command line, https://addons.mozilla.org/en-US/firefox/addon/media-converter-and-muxer
2. Masoud Alimadadi

   If you don’t want to re-encode audio and video, you can use following command:

   ffmpeg -i video.mp4 -i audio.m4a -c:v copy -c:a copy output.mp4
   

   It will execute a lot faster.
• David Walsh

  Updated! Thank you!
• Bumpledink Scrotleworth

  You can specify to copy both at once like this:

  ffmpeg -i video.mp4 -i audio.m4a -c copy output.mp4
• Jabir

  This works like charm and looks few flags shorter too.
3. Zak Kahn

   Hi David,

   Nice article. Would these same commands work efficiently on android too?

   We have a mute video to which we hope to add audio recorded from phone.

   Any guidance would be great.
4. JC

   Can’t find ffmpeg in a zip file. Any other similar tool that opens in Windows?
5. Kevin

   I’m not a programmer so I’m sort of confused and frustrated at what I’m looking at. I have no idea how to use this lol
6. howard Johnson

   Here is an example batch file that you can drag the two files onto to do the joining, delete the two files and rename to the original. (drag by the mp4 file)

   @echo off 
   "C:\Program Files (x86)\ffmpeg\bin\ffmpeg.exe" -i %1 -i %2 -c:v copy -c:a copy d:\folder\output.mp4
   del %1
   del %2
   copy d:\folder\output.mp4 %1
   del d:\folder\output.mp4 
   pause
   
7. Ravi Sharma

   where do we keep ffmpeg.exe file and that audio and video files to whom we merge.