如何修剪视频文件并使用Swift转换为20秒视频? [英] How to trim the video file and convert to 20 seconds video with Swift?
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问题描述
我想修剪一个视频文件。我想从图库中选择视频并将其转换为15秒的视频。我正在关注这 链接。它适合我,但我是Swift语言的初学者。任何人都可以帮我转换Swift中的代码吗?
I want to trim a video file. I want to just pick the video from gallery and convert it to a 15 second video. I am following this link for Objective C. It works fine for me but I'm a beginner with the Swift language. Can any one help me to convert this code in Swift?
以下是我在Objective C中的代码:
-(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(19.0, 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];
}];
}
-(void)writeVideoToPhotoLibrary:(NSURL*)aURL
{
NSURL *url = aURL;
NSData *data = [NSData dataWithContentsOfURL:url];
// Write it to cache directory
NSString *path = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingPathComponent:@"file.mov"];
[data writeToFile:path atomically:YES];
// After that use this path to save it to PhotoLibrary
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
[library writeVideoAtPathToSavedPhotosAlbum:[NSURL fileURLWithPath:path] completionBlock:^(NSURL *assetURL, NSError *error) {
if (error) {
NSLog(@"%@", error.description);
}else {
NSLog(@"Done :)");
}
}];
}
推荐答案
对于swift,您可以使用以下代码修剪视频。
For swift you can use the following code for trimming the video.
func trimVideo(sourceURL: NSURL, destinationURL: NSURL, trimPoints: TrimPoints, completion: TrimCompletion?) {
assert(sourceURL.fileURL)
assert(destinationURL.fileURL)
let options = [ AVURLAssetPreferPreciseDurationAndTimingKey: true ]
let asset = AVURLAsset(URL: sourceURL, options: options)
let preferredPreset = AVAssetExportPresetPassthrough
if verifyPresetForAsset(preferredPreset, asset) {
let composition = AVMutableComposition()
let videoCompTrack = composition.addMutableTrackWithMediaType(AVMediaTypeVideo, preferredTrackID: CMPersistentTrackID())
let audioCompTrack = composition.addMutableTrackWithMediaType(AVMediaTypeAudio, preferredTrackID: CMPersistentTrackID())
let assetVideoTrack: AVAssetTrack = asset.tracksWithMediaType(AVMediaTypeVideo).first as! AVAssetTrack
let assetAudioTrack: AVAssetTrack = asset.tracksWithMediaType(AVMediaTypeAudio).first as! AVAssetTrack
var compError: NSError?
var accumulatedTime = kCMTimeZero
for (startTimeForCurrentSlice, endTimeForCurrentSlice) in trimPoints {
let durationOfCurrentSlice = CMTimeSubtract(endTimeForCurrentSlice, startTimeForCurrentSlice)
let timeRangeForCurrentSlice = CMTimeRangeMake(startTimeForCurrentSlice, durationOfCurrentSlice)
videoCompTrack.insertTimeRange(timeRangeForCurrentSlice, ofTrack: assetVideoTrack, atTime: accumulatedTime, error: &compError)
audioCompTrack.insertTimeRange(timeRangeForCurrentSlice, ofTrack: assetAudioTrack, atTime: accumulatedTime, error: &compError)
if compError != nil {
NSLog("error during composition: \(compError)")
if let completion = completion {
completion(compError)
}
}
accumulatedTime = CMTimeAdd(accumulatedTime, durationOfCurrentSlice)
}
let exportSession = AVAssetExportSession(asset: composition, presetName: preferredPreset)
exportSession.outputURL = destinationURL
exportSession.outputFileType = AVFileTypeAppleM4V
exportSession.shouldOptimizeForNetworkUse = true
removeFileAtURLIfExists(destinationURL)
exportSession.exportAsynchronouslyWithCompletionHandler({ () -> Void in
if let completion = completion {
completion(exportSession.error)
}
})
} else {
NSLog("Could not find a suitable export preset for the input video")
let error = NSError(domain: "org.linuxguy.VideoLab", code: -1, userInfo: nil)
if let completion = completion {
completion(error)
}
}
}
TrimPoints是CMTime。
TrimPoints is a CMTime.
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