Veja Filtro de origem do DirectShow do QuickTime :
MediaLooks QuickTime Source is a DirectShow source filter that allows developers to playback Apple QuickTime media (.MOV, .AMR, .MP4, etc.) via the native QuickTime runtime. The filter requires QuickTime Player (7.0 or higher) to be available on the computer.
Since the native QuickTime runtime code is used for playback, there is no degradation of quality compared to the original QuickTime player.
This product is free for end users if used for personal non-commercial goals.