视频压缩iOS

最新推荐文章于 2020-11-25 13:33:01 发布

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本文介绍了一种在iOS设备上实现视频转码的方法，通过使用AVFoundation框架中的AVAssetExportSession进行视频压缩与格式转换，并提供了详细的代码实现过程。

注意：需要判断之前的文件是否存在 ，如果存在则删除文件     [fileManager createDirectoryAtPath:createPath withIntermediateDirectories:YES attributes:nil error:nil];

- (void)convertVideoWithModel
{
    [self creatSandBoxFilePathIfNoExist];
    //保存至沙盒路径
    NSString *pathDocuments = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    NSString *videoPath = [NSString stringWithFormat:@"%@/Video", pathDocuments];
    //转码配置
    AVURLAsset *asset = [AVURLAsset URLAssetWithURL:self.videoURL options:nil];
    
    //AVAssetExportPresetMediumQuality可以更改，是枚举类型，官方有提供，更改该值可以改变视频的压缩比例
    AVAssetExportSession *exportSession= [[AVAssetExportSession alloc] initWithAsset:asset presetName:AVAssetExportPresetMediumQuality];
    exportSession.shouldOptimizeForNetworkUse = YES;
    exportSession.outputURL = [NSURL fileURLWithPath:[videoPath stringByAppendingPathComponent:@"fourmVideo.mp4"]];
    //AVFileTypeMPEG4 文件输出类型，可以更改，是枚举类型，官方有提供，更改该值也可以改变视频的压缩比例
    exportSession.outputFileType = AVFileTypeQuickTimeMovie;
    [exportSession exportAsynchronouslyWithCompletionHandler:^{
        int exportStatus = exportSession.status;
        NSLog(@"%d",exportStatus);
        switch (exportStatus)
        {
            case AVAssetExportSessionStatusFailed:
            {
                // log error to text view
                NSError *exportError = exportSession.error;
                NSLog (@"AVAssetExportSessionStatusFailed: %@", exportError);
                NSData *videoData = [NSData dataWithContentsOfURL:self.videoURL];
                self.loadVideoData(self.videoURL,videoData);

                break;
            }
            case AVAssetExportSessionStatusCompleted:
            {
                NSLog(@"视频转码成功");
                NSData *videoData = [NSData dataWithContentsOfFile:[videoPath stringByAppendingPathComponent:@"fourmVideo.mp4"]];
                self.loadVideoData(_videoURL,videoData);
            }
        }
    }];
    
}


- (void)creatSandBoxFilePathIfNoExist
{
    //沙盒路径
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentDirectory = [paths objectAtIndex:0];
    NSLog(@"databse--->%@",documentDirectory);
    
    NSFileManager *fileManager = [[NSFileManager alloc] init];
    NSString *pathDocuments = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    //创建目录
    NSString *createPath = [NSString stringWithFormat:@"%@/Video", pathDocuments];
    // 判断文件夹是否存在，如果不存在，则创建
    if ([[NSFileManager defaultManager] fileExistsAtPath:createPath]) {
        NSError *error;
        if ([[NSFileManager defaultManager] removeItemAtPath:createPath error:&error] == NO) {
            NSLog(@"removeitematpath %@ error :%@", createPath, error);
        }
    }
    [fileManager createDirectoryAtPath:createPath withIntermediateDirectories:YES attributes:nil error:nil];

}