MKV2M4V1.3.2

MKV2M4V is a simple front-end to 'FFmpeg' and 'MP4Box'. It does a great job in coverting MKV video files to M4V video files. It is particularly quick for repackaging MKV files which already have tracks with the correct format for M4V. The conversion is quick, pass-through, with minimal CPU time. It has the advantage of being able to queue a large group of files and run the conversion all at one time. You thus don't have to babysit the computer for each file conversion. Just drag the whole group of files to the file-list pane. Set the parameters. Press Start and there you go. Come back when they are all done! Other converters force you to do one file at a time. Handbrake can queue jobs but it uses a lot of CPU power to do the conversion. When you don't need to convert the video, this takes a long long time to do. This is well worth $2.99. Heck, I spend four times for lunch each day. It could use more obvious interface buttons. For example "Enq", "Q" are very vague buttons.

There are at least 4 FREE apps which do the same thing (my favorite is remux). Though none of the free alternatives can convert FLAC streams in a movie file (at least not that I know of), I have NEVER, EVER seen a FLAC audio stream in a movie file (and I work with multiple formats from various sources every day). But, even if I were to find a FLAC stream in a movie file, there are several free tools that can be used to quickly and easily demux the stream (I like MKVTool), convert the audio independently to AC-3, AAC or whatever (my favorite is XLD), then remux it with the video stream into an MP4 file (I like Subler). Though some apps will only mux/remux to the .mp4 extension, if you simply must have the .m4v extension for iTunes compatibility (which, IMHO, is a horrific way to watch media, so I never use it), just change the .mp4 extension manually to .m4v (because the only difference between them is that Apple made the stupid decision years ago to force its native apps (like iTunes) use a proprietary extension.