subtitle format for iMovie
I have a 45 minute play which I had videoed at its first performance. The sound quality was really bad so I tried to caption it in iMovie, but it was just too labor intensive. I had it subtitled by rev.com. The file is ready but they're asking me what format(s) I want to download. The choices are
srt
ttml
txt
dfxp
mcc
txt
scc
qt.txt
vtt
cap
stl
srt(facebook ready)
The video I have now with the bad sound quality is an mp4 format. I want the final product to be another mp4 file with the subtitles embedded. So I have 2 questions.
#1. What format should I download?
#2. How do I embed the subtitles in the mp4?
If you haven't figured it out yet, I'm not very good at iMovie or any of this stuff. Thank you in advance.
P.S. I have a MacBook Air with 0SX 10.10.5, iMovie is 10.1.1
MacBook, Mac OS X (10.6.8)