FFmpeg Command Line Tool Mac OS X Install

1. Go to ffmpegmac and download the binary.
2. Copy ffmpeg to /usr/local/bin.
3. Execute the following in Terminal (as admin):

   sudo chown root:wheel /usr/local/bin/ffmpeg 

   sudo chmod 755 /usr/local/bin/ffmpeg

Now you have a working version of ffmpeg in the Terminal.

Now if you have mp4 files that need to be repacked without re-encoding them, open the terminal, change to the directory of the file and execute the following command (changing video.mp4 and newvideo.mp4 with titles of choice):

ffmpeg -i video.mp4 -acodec copy -vcodec copy newvideo.mp4