You can try this tool I programmed to convert into an ".mp4" container and then just rename that to ".m4v". There is no guarantee, but it might actually work. If it does, it's very fast and without any loss in quality.
I have no idea if the subtitles work though. Are they in a seperate file or included in the ".mkv"? If the latter, I think you might be out of luck...
Video seems good, but there is no sound. I cant find out why.
Did the input have a DTS track?
BTW, you really should give Subler a try. It rocks.
Yes it have a DTS track. I guess that Subler is only for subtitles only, isn't it?
You can try this tool I programmed
I've had that for a while now but it doesn't seem to do anything for me.
It'll say 'Done.', but nothing actually happens.
That is seriously strange. Error messages are caught and displayed on screen, so if there is no error message, the output file should have been produced. Can you tell me what container you wanted to convert into what other container? Or maybe make a screen capture of what happens? I would love to get to the bottom of this...
Oh, also, thread-relevant: Subler is awesome! Definitely give it a try! My tool was just made for more container formats that Subler couldn't handle... and it is way less powerful, especially when it comes to metadata and subtitles!