如何使用 iOS SDK 修剪视频文件并转换为 15 秒视频

How to trim the video file and convert to 15 seconds video with iOS SDK?(如何使用 iOS SDK 修剪视频文件并转换为 15 秒视频?)

问题描述

我想修剪视频文件.我只想从画廊中挑选视频并将其转换为 15 秒视频.如果我使用选择器视图控制器进行正常修剪，它不会指定时间而只显示帧，但我需要固定 15 秒.我怎样才能做到这一点?

I want to trim a video file. I want to just pick the video from a gallery and convert it to a 15-second video. If I use normal trimming with picker view controller, it does not specify a time and just shows the frames, but I need to be fixed for 15 seconds. How can I achieve this?

推荐答案

Objective-C

-(void)cropVideo:(NSURL*)videoToTrimURL{
    AVURLAsset *asset = [AVURLAsset URLAssetWithURL:videoToTrimURL options:nil];
    AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:asset presetName:AVAssetExportPresetHighestQuality];

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *outputURL = paths[0];
    NSFileManager *manager = [NSFileManager defaultManager];
    [manager createDirectoryAtPath:outputURL withIntermediateDirectories:YES attributes:nil error:nil];
    outputURL = [outputURL stringByAppendingPathComponent:@"output.mp4"];
    // Remove Existing File
    [manager removeItemAtPath:outputURL error:nil];


    exportSession.outputURL = [NSURL fileURLWithPath:outputURL];
    exportSession.shouldOptimizeForNetworkUse = YES;
    exportSession.outputFileType = AVFileTypeQuickTimeMovie;
    CMTime start = CMTimeMakeWithSeconds(1.0, 600); // you will modify time range here
    CMTime duration = CMTimeMakeWithSeconds(15.0, 600);
    CMTimeRange range = CMTimeRangeMake(start, duration);
    exportSession.timeRange = range;
    [exportSession exportAsynchronouslyWithCompletionHandler:^(void)
     {
         switch (exportSession.status) {
             case AVAssetExportSessionStatusCompleted:
                 [self writeVideoToPhotoLibrary:[NSURL fileURLWithPath:outputURL]];
                 NSLog(@"Export Complete %d %@", exportSession.status, exportSession.error);
                 break;
             case AVAssetExportSessionStatusFailed:
                 NSLog(@"Failed:%@",exportSession.error);
                 break;
             case AVAssetExportSessionStatusCancelled:
                 NSLog(@"Canceled:%@",exportSession.error);
                 break;
             default:
                 break;
         }

         //[exportSession release];
     }];
}

在 Swift 4.0 中

    static func cropVideo(atURL url:URL) {
    let asset = AVURLAsset(url: url)
    let exportSession = AVAssetExportSession.init(asset: asset, presetName: AVAssetExportPresetHighestQuality)!
    var outputURL = URL(string:NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory, FileManager.SearchPathDomainMask.userDomainMask, true).last!)

    let fileManager = FileManager.default
    do {
        try fileManager.createDirectory(at: outputURL!, withIntermediateDirectories: true, attributes: nil)
    } catch {

    }

    outputURL?.appendPathComponent("output.mp4")
    // Remove existing file
    do {
        try fileManager.removeItem(at: outputURL!)
    }
    catch {

    }

    exportSession.outputURL = outputURL
    exportSession.shouldOptimizeForNetworkUse = true
    exportSession.outputFileType = AVFileTypeQuickTimeMovie
    let start = CMTimeMakeWithSeconds(1.0, 600) // you will modify time range here
    let duration = CMTimeMakeWithSeconds(15.0, 600)
    let range = CMTimeRangeMake(start, duration)
    exportSession.timeRange = range
    exportSession.exportAsynchronously {
        switch(exportSession.status) {
        case .completed: break
            //
        case .failed: break
            //
        case .cancelled: break
            //
        default: break
        }
    }
}

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