uiimagepickercontroller – 具有mp4格式的IOS UIImagePicker

2023年9月25日 261次阅读

是否可以保存视频并将其添加到自定义ALAsset,从MP4格式的UI
ImagePicker捕获？或者我必须将它保存在.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.您可以在此处指定压缩视频的视频类型,质量和输出网址.

见下面的方法：

- (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);
    }];
}

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查看详细信息：

Sample demo:

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