我以120FPS录制了视频。这是SLOW_Mo视频。如果我使用PHImageManager在CameraRoll中导出该视频。一切正常，就像VIDEO Effect为slow_mo。我可以使用QuickPlayer和AVPlayer播放它，效果是120FPS。
这是我的工作代码：
PHAsset *oneVideo = [[PHAsset fetchAssetsWithMediaType:PHAssetMediaTypeVideo options:nil] lastObject];
PHVideoRequestOptions *options = [PHVideoRequestOptions new];
options.networkAccessAllowed = YES;
options.version = PHVideoRequestOptionsVersionCurrent;
options.deliveryMode = PHVideoRequestOptionsDeliveryModeHighQualityFormat;
[[PHImageManager defaultManager] requestAVAssetForVideo:oneVideo options:options resultHandler:^(AVAsset *asset, AVAudioMix *audioMix, NSDictionary *info) {
if(([asset isKindOfClass:[AVComposition class]])){
BOOL bResult = FALSE;
DebugLog(@"\navPlayer.outputFileURL.absoluteString:%@", URl);
bResult = [[NSFileManager defaultManager] removeItemAtURL:URl error:nil];
DebugLog(@"\nremoveItemAtPath:%d", bResult);
//Begin slow mo video export
AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset:asset presetName:AVAssetExportPresetHighestQuality];
exporter.outputURL = avPlayer.outputFileURL;
// exporter.outputURL = urlFirstVideoPath;
exporter.outputFileType = AVFileTypeQuickTimeMovie;
exporter.shouldOptimizeForNetworkUse = YES;
[exporter exportAsynchronouslyWithCompletionHandler:^{
NSLog(@"Video test run exported video into file: %@", exporter.outputURL);
NSLog(@"exportSession.status: %ld", (long)exporter.status);
dispatch_async(dispatch_get_main_queue(), ^{
if (exporter.status == AVAssetExportSessionStatusCompleted) {
NSLog(@"exportSession.status: okkkkkkk");
}
});
}];
}
}];
现在，我不想将该视频保存在CAMERAROLL中。我将视频保存在“文档”文件夹中。并获得AVAsets。但是效果不是不是slow_mo 120FPS ，我读到了有关的信息，并知道应该使用AVComposition来导出slow_mo视频。但是我做不到。下面是我的无效代码。
AVAsset *assetURL = [AVURLAsset URLAssetWithURL:URl options:nil];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = paths.firstObject;
NSString *myPathDocs = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"mergeSlowMoVideo-%d.mov",arc4random() % 1000]];
NSURL *_filePath = [NSURL fileURLWithPath:myPathDocs];
AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset:assetURL presetName:AVAssetExportPresetHighestQuality];
exporter.outputURL = _filePath;
exporter.outputFileType = AVFileTypeQuickTimeMovie;
exporter.shouldOptimizeForNetworkUse = YES;
[exporter exportAsynchronouslyWithCompletionHandler:^{ //start
NSLog(@"Export failed: %@", [[exporter error] localizedDescription]);
NSLog(@"Video test run exported video into file: %@", exporter.outputURL);
NSLog(@"export %ld", (long)exporter.status);
dispatch_async(dispatch_get_main_queue(), ^{
if (exporter.status == AVAssetExportSessionStatusCompleted) {
}
});
}];
请任何专家帮助我。
更新：这是我的实际问题。