Image may be NSFW.
Clik here to view.
Clik here to view.
Back in October, upon publishing my tutorial (link) on fixing videos no longer playable in most iOS video players, the then-current version of the tool to be used, MKVTools, wasn't still able to add an AAC track in addition to the original AC3 one without human intervention. (Just to recap: AAC is the iOS-friendly audio format and AC3 is the format that is no longer supported in almost any third-party iOS multimedia players, “thanks” to Dolby's forcing developers to drop the support.)
