avassetexportsession

问题 On iPhone 7 and iPadPro 9.7, running iOS 14.3, the AVAssetExportSession never starts exporting when calling exportSession.exportAsynchronously , it simply appears to be stuck with no error messages describing what is wrong. If we reboot those devices, and run exportSession.exportAsynchronously , then the export starts immediately and completes successfully. The issue does not occur on my iPhone 12 Pro. It appears to be a bug in iOS 14.3 as is reported at the below link. But, I cannot find the

问题 EDIT: To make things easier to anyone interested in checking out this problem, I added a demo project to this github repository. Issue I've seen several questions that had the same error, but none of the solutions found there helped me. Figured I'd try my luck. I'm trying to export a video as is, mainly to learn about AVFoundation and AVAssetExportSession. My export works perfectly fine on the simulator, but does not work on any iOS device I've tried (namely an iPhone X and an iPhone XR

问题 Objective : I have a Video over which I have a UIView which contains animated GIFs(not locally stored, but using giphy api), Texts, or hand drawings. I want to export this along with the image in a single video. What I did : I created a UIView on which the animations are. Then converted that to CALayer and added to video with AVMutableVideoCompotion. Problem : The UIView with animations is being converted to an Image instead of a video. How can I solve this. Below is the Program for my export

问题 I need to be able to merge videos taken with the time lapse function in the Camera app on iOS and export as a single video. However, even if I try to export a single, unchanged time lapse video to the Photo Library, it saves as a completely black video (with the correct duration). Here is the sample code I wrote to just export a single, unchanged video (most of which is adapted from a Ray Wenderlich tutorial): @IBAction func saveVideo(_ sender: UIBarButtonItem) { // 1 - Early exit if there's

问题 I need to be able to merge videos taken with the time lapse function in the Camera app on iOS and export as a single video. However, even if I try to export a single, unchanged time lapse video to the Photo Library, it saves as a completely black video (with the correct duration). Here is the sample code I wrote to just export a single, unchanged video (most of which is adapted from a Ray Wenderlich tutorial): @IBAction func saveVideo(_ sender: UIBarButtonItem) { // 1 - Early exit if there's

问题 I need to be able to merge videos taken with the time lapse function in the Camera app on iOS and export as a single video. However, even if I try to export a single, unchanged time lapse video to the Photo Library, it saves as a completely black video (with the correct duration). Here is the sample code I wrote to just export a single, unchanged video (most of which is adapted from a Ray Wenderlich tutorial): @IBAction func saveVideo(_ sender: UIBarButtonItem) { // 1 - Early exit if there's

问题 I need to be able to merge videos taken with the time lapse function in the Camera app on iOS and export as a single video. However, even if I try to export a single, unchanged time lapse video to the Photo Library, it saves as a completely black video (with the correct duration). Here is the sample code I wrote to just export a single, unchanged video (most of which is adapted from a Ray Wenderlich tutorial): @IBAction func saveVideo(_ sender: UIBarButtonItem) { // 1 - Early exit if there's

来源： https://stackoverflow.com/questions/64161544/avassettracks-preferredtransform-sometimes-seems-to-be-wrong-how-can-this-be-f

问题 when i export a video asset via AVAssetExportSession the result file is in landspace mode. (file grabbed via itune->apps->file sharing->my app). how can i export the video asset in portrait mode (rotate it)? 回答1: The video coming from the iPhone capture device are always landscape orientated whatever the device orientation is when capturing. If you want to rotate your video, the 'simple' solution is to assign a transform to the video track of the exported session. Create 2 mutable tracks in

问题 I am now trying to export an mp3 file that has been player using AVPlayer (using an url) so it doesn't have to be downloaded twice. This is my sample code: I've tried every outputFileType... self.exporter = [[AVAssetExportSession alloc] initWithAsset:self.asset presetName:AVAssetExportPresetPassthrough]; } NSError *error; NSLog(@"export.supportedFileTypes : %@",self.exporter.supportedFileTypes); // "com.apple.quicktime-movie", // "com.apple.m4a-audio", // "public.mpeg-4", // "com.apple.m4v