Hi Everyone! I am writing a media extension to playback old "Amiga" ANIM files, as a test project. I have build the following objects: MEFormatReader METrackReader MESampleCursor The subclassed objects seem fairly straightforward. Rather than create a Video Decoder, I followed the instructions in the SampleCursor object header, and use the function: loadSampleBufferContainingSamplesToEndCursor:completionHandler: to deliver an BGRA 8-bit image. This works great AVPlayer object in my Swift based test app, but QuickTime Player will not actually play the movie. If I scrub on QuickTime Player's timeline, I can watch the movie just fine. But if I click on the "Play" button. Nothing happens. For fun, I created a custom pixel type, and implemented a MEVideoDecoder object. This also works with my AVPlayer test app, but again, same problem with QuickTime Player. I have even generated a JPEG image in the SampleCursor, and that fails too. I am stumped on this. I do not see any way to have QuickTime Player work properly with my MediaExtension, nor is there any documentation as to what to do. Suggestions? bob