ffmpeg -i inputfile.mov -c copy outputfile.mp4
ffmpeg -i inputfile.mov -c:v libx264 -preset slow -crf 30 -c:a aac -b:a 128k -pix_fmt yuv420p -movflags +faststart outputfile.
Embed subtitle file in MP4
ffmpeg -i infile.mp4 -i infile.srt -c copy -c:s mov_text outfile.mp4