uiimagepickercontroller - 带有mp4格式的iOS UIImagePicker

是否可以保存视频并将其添加到以MP4格式从UIImagePicker捕获的自定义ALAsset中？还是我必须将其保存在.mov中并通过AVAssetExportSession进行压缩？

最佳答案

是的，您可以使用AVAssetExportSession压缩视频。您可以在此处指定视频类型，质量和用于压缩视频的输出URL。

参见以下方法:

- (void) saveVideoToLocal:(NSURL *)videoURL {

    @try {
        NSArray *documentsDirectory = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        NSString *docPath = [documentsDirectory objectAtIndex:0];

        NSString *videoName = [NSString stringWithFormat:@"sampleVideo.mp4"];
        NSString *videoPath = [docPath stringByAppendingPathComponent:videoName];

        NSURL *outputURL = [NSURL fileURLWithPath:videoPath];

        NSLog(@"Loading video");

        [self convertVideoToLowQuailtyWithInputURL:videoURL outputURL:outputURL handler:^(AVAssetExportSession *exportSession) {

             if (exportSession.status == AVAssetExportSessionStatusCompleted) {
                 NSLog(@"Compression is done");
             }
             [self performSelectorOnMainThread:@selector(doneCompressing) withObject:nil waitUntilDone:YES];
         }];
    }
    @catch (NSException *exception) {
        NSLog(@"Exception :%@",exception.description);
        [self performSelectorOnMainThread:@selector(doneCompressing) withObject:nil waitUntilDone:YES];
    }
}


//---------------------------------------------------------------

- (void)convertVideoToLowQuailtyWithInputURL:(NSURL*)inputURL outputURL:(NSURL*)outputURL handler:(void (^)(AVAssetExportSession*))handler {
    [[NSFileManager defaultManager] removeItemAtURL:outputURL error:nil];
    AVURLAsset *asset = [AVURLAsset URLAssetWithURL:inputURL options:nil];
    AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:asset presetName:AVAssetExportPresetPassthrough];
    exportSession.outputURL = outputURL;
    exportSession.outputFileType = AVFileTypeMPEG4;
    [exportSession exportAsynchronouslyWithCompletionHandler:^(void) {
        handler(exportSession);
    }];
}

在这里，我将压缩视频保存到应用程序的文档目录中。您可以在下面的示例代码中检查其详细工作:

Sample demo:

关于uiimagepickercontroller - 带有mp4格式的iOS UIImagePicker，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/13912139/