I have a bunch of MP4s that I want to eliminate the audio on. Is there a utility I can run that strips out the audio component? Also, if I take out the audio, how much will that reduce the size of the MP4?
Try VLC, it is a “Swiss army knife” of media player/converter programs.
Removing the audio likely won’t reduce the size that much, very rough guess maybe 10% or so.
avidemux will do an excellent job of this.
Maybe a 2MB/minute reduction in file size. Depends on a lot of things, but that’s the ballpark. It’ll be minimal compared to the video, most likely.
MPEG Streamclip is a nice free simple program that will do this (and other stuff.) There’s an option to remove the audio track and you can then save the file as almost any format you’d like.
You can easily do this with the command-line tool FFmpeg:
ffmpeg -i myvideo.mp4 -c copy -an myvideo-mute.mp4
How much this will reduce the size depends entirely on the video. For a normal feature-length film, not a whole lot (maybe five to ten percent). For a music video set to a slide show of static images, removing the audio will cut the file down to almost nothing.