I want to batch convert all .mkv files in a folder into .mp4 with VLC.

It should use the original video-/audio stream and if possible the .ass subtitle of the .mkv. It's not really a conversion, it's more like changing the container – my player can't read the MKV videos.

If I do this conversion by hand (manually) it works, but I have a lot of MKV files to convert, so it would take a lot of time.

I have searched the internet for a batch file to do this and I found a few. I tried to modify them to my wish, but all attempts I tried just created a .mp4 file that doesn't contain the audio stream and the video stream also cannot be rendered by all my media players on the PC.

So could someone tell me how the batch has to look like, so it works with the original video and audio stream (and maybe .ass subtitles)?