avassetexportsession

I'm attempting to combine an image and a video. I have them combining and exporting however it's rotated side ways. Sorry for the bulk code paste. I've seen answers about applying a transform to compositionVideoTrack.preferredTransform however that does nothing. Adding to AVMutableVideoCompositionInstruction does nothing also. I feel like this area is where things start to go wrong. here here: // I feel like this loading here is the problem let videoTrack = videoAsset.tracksWithMediaType(AVMediaTypeVideo)[0] // because it makes our parentLayer and videoLayer sizes wrong let videoSize =

I've got an app that exports an AVMutableComposition into a .mov file, and I'd like for the user to see the status of the export with a progress bar the same way that you would if you sent a text message or uploaded a file. I know how to create a progress bar when I know the duration of a task (such as playing an audio file), but since there's no set duration for the export I'm unsure how to proceed. I've got an activity indicator currently but it doesn't provide the best user experience. Does anyone have any pointers? Orpheus Mercury I came up with an answer a while back so I'll post it in

From the Apple documentation it just says: When the value of this property is YES, the output file will be written in such a way that playback can start after only a small amount of the file is downloaded. But what is actually happening? Matti Savolainen When shouldOptimizeForNetworkUse is set to YES calling finishWriting will move the MP4 moov atom (movie atom) from the end of the file to the beginning of the file. The moov atom contains information about the movie file like timescale and duration. The moov also contains "subatoms" which contain information like the tracks, the data offsets

I'm trying to bake a CALayer into portrait-mode video (on export) using an AVMutableComposition, an AVMutableVideoComposition and a AVVideoCompositionCoreAnimationTool on iOS 4.3. This all works in landscape. If I capture video in portrait, however, the AVVideoCompositionCoreAnimationTool is ignoring the transform on the video track. That is, for portrait-mode video, I am setting AVMutableCompositionTrack.preferredTransform to the preferredTransform value from the original asset video track. As long as I don't use a AVVideoCompositionCoreAnimationTool, this works, and the video comes out in