iOS以编程方式将AVI转换为MP4格式 [英] iOS Convert AVI to MP4 Format programatically

问题描述

我的应用程序中有一个查询，因为我想将AVI格式的视频转换为MP4电影格式，所以有什么方法可以通过编程方式实现.

I have one query in my application, for that i want to convert my AVI formatted video to MP4 movie format, so is there any way to do this programatically.

任何代码段都会受到赞赏.

Any code snippet will be appreciated.

推荐答案

您需要使用AVAssetExportSession将视频转换为.mp4格式，以下方法将.avi格式的视频转换为.mp4.

You need to use AVAssetExportSession to convert videos to .mp4 format, below method convert .avi format videos to .mp4.

检查exportSession.outputFileType = AVFileTypeMPEG4;行，该行指定视频的输出格式.

Check the line exportSession.outputFileType = AVFileTypeMPEG4; it specify the output format of the video.

此处inputURL是视频的网址，需要转换，outputURL将是视频的最终目标.

Here inputURL is an url of video which needs to be converted and outputURL will be the final destination of video.

还有一件别忘了在outputURL视频文件中指定.mp4扩展名.

One more thing don't forget to specify .mp4 extension in outputURL video file.

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:@"MyVideo.mp4"];
NSURL *outputURL = [NSURL fileURLWithPath:filePath];

[self convertVideoToLowQuailtyWithInputURL:localUrl outputURL:outputURL handler:^(AVAssetExportSession *exportSession)
{
    if (exportSession.status == AVAssetExportSessionStatusCompleted) {
        // Video conversation completed
    }          
}];

- (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);
     }];
}

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