Hello, usually I'm using MKVtools to convert my MKV movies to MP4, but lately I had some playback errors, so I've tried Subler and didn't get any errors. But there is some feature missing in Subler, I'm not able to add a second stereo AAC stream, if my movie contains an AC3 stream. So I'm looking for an easy way to convert the AC3 stream (I've extracted it using MKVtools) to an AAC stream. After that I can add it to my MP4 using Subler. Hope someone can help me Thanks!