is what a way to do this?
why I need to do this
1. I have a subtitle issue see this topic
2. I'm using a Xbox 360, it can decode H.264 and AC3! just can't recognize H.264 + AC3 when they are in the MKV container. So I hope to change the option (-oac and -vac) to copy not reencode (when I don't want subtitles)
3. AC3 Audio should be set to copy not reencode!