ios 视频的裁剪，转换，压缩原创
honey缘木鱼
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编辑于2019年05月16日 09:34:15
摘要由AI智能服务提供本文描述了一个视频编辑功能的实现过程，该功能包括从相册选择视频、视频播放、视频裁剪、格式转换及压缩等。首先，通过`TZImagePickerController`选择视频，并利用`PHImageManager`和`AVURLAsset`获取视频原始资源。随后，利用`AVPlayer`和`AVPlayerLayer`实现视频播放功能。在视频裁剪功能上，通过添加`UIPanGestureRecognizer`手势识别器实现滑动裁剪视频的功能，用户可以通过拖动左右滑块来裁剪视频片段。此外，还提到了一些功能的具体实现步骤，如滑动手势的响应和裁剪视频的具体逻辑。整体流程涵盖了视频处理的基本步骤，包括选择、播放和编辑视频。
有用
反馈
最近项目中有一个视频编辑功能，类似一个视频处理工具，针对于视频的裁剪(大小和尺寸),格式的转换(mp4,mov,gif)，视频的压缩等功能。
实现功能截图
主要实现步骤为：
一.从相册选择视频播放
TZImagePickerController *imagePickerVc = [[TZImagePickerController alloc] initWithMaxImagesCount:1 delegate:nil];
imagePickerVc.allowPickingVideo = YES;
imagePickerVc.allowPickingImage = NO;
WS(ws);
[imagePickerVc setDidFinishPickingVideoHandle:^(UIImage *coverImage,id asset){
MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
hud.label.text = @"Processing...";
PHVideoRequestOptions *options = [[PHVideoRequestOptions alloc] init];
options.version = PHImageRequestOptionsVersionOriginal;
options.networkAccessAllowed = YES;
options.deliveryMode = PHVideoRequestOptionsDeliveryModeAutomatic;
PHImageManager *manager = [PHImageManager defaultManager];
[manager requestAVAssetForVideo:asset options:options resultHandler:^(AVAsset * _Nullable asset, AVAudioMix * _Nullable audioMix, NSDictionary * _Nullable info) { AVURLAsset *urlAsset = (AVURLAsset *)asset; NSURL *url = urlAsset.URL; dispatch_async(dispatch_get_main_queue(), ^{
[MBProgressHUD hideHUDForView:ws.view animated:YES];
NSString * sandboxExtensionTokenKey = info[@"PHImageFileSandboxExtensionTokenKey"]; NSArray * arr = [sandboxExtensionTokenKey componentsSeparatedByString:@";"]; NSString * filePath = [arr[arr.count - 1]substringFromIndex:9]; CGFloat size = [MyUtility getFileSize:filePath];
SNHVideoTrimmerController *vc = [[SNHVideoTrimmerController alloc] init];
vc.videoUrl = url;//视频地址
vc.fileSize = size;
vc.changeAsset = asset;
vc.flag = tap.view.tag;
[self.navigationController pushViewController:vc animated:YES];
});
}];
}];
[self presentViewController:imagePickerVc animated:YES completion:nil];二.用AVPlayer实现视频播放(自己封装个简单的播放器即可)
self.playerItem = [AVPlayerItem playerItemWithAsset:self.asset]; self.player = [AVPlayer playerWithPlayerItem:self.playerItem]; self.playerLayer = [AVPlayerLayer playerLayerWithPlayer:self.player]; self.playerLayer.videoGravity = AVLayerVideoGravityResizeAspect; self.player.actionAtItemEnd = AVPlayerActionAtItemEndNone; self.playerLayer.frame = self.videoPlayerView.bounds; [self.videoPlayerView.layer addSublayer:self.playerLayer];
三.具体功能的实现
(1).视频大小的裁剪主要是实现滑动视图(视图遮盖、左右滑动裁剪)功能。
//拖动手势:改变要截取的内容 UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(moveOverlayView:)]; panGestureRecognizer.maximumNumberOfTouches = 1; [self addGestureRecognizer:panGestureRecognizer];
用户左右滑动裁剪视频的主要功能代码的实现：
#pragma mark - =================== 滑动手势 ===================
- (void)moveOverlayView:(UIPanGestureRecognizer *)gesture
{
switch (gesture.state) {
case UIGestureRecognizerStateBegan:
{
CGFloat offsetWidth = 12;
CGPoint po = [gesture locationInView:self];
CGRect leftThumbViewRectInSelf = [self convertRect:CGRectMake(-offsetWidth, 0, _leftThumbView.frame.size.width + offsetWidth * 2, _leftThumbView.frame.size.height) fromView:_leftThumbView]; BOOL isLeft = CGRectContainsPoint(leftThumbViewRectInSelf, po);
_isDraggingLeftOverlayView = isLeft;
CGRect rightThumbViewRectInSelf = [self convertRect:CGRectMake(-offsetWidth, 0, _rightThumbView.frame.size.width + offsetWidth * 2, _rightThumbView.frame.size.height) fromView:_rightThumbView]; BOOL isRight = CGRectContainsPoint(rightThumbViewRectInSelf, po);
_isDraggingRightOverlayView = isRight;
if (!isLeft && !isRight) {
return;
} if (CMTimeGetSeconds([self.asset duration]) <= self.minLength) {
[self showNoSmallerTrimMessage];
return;
} if (isRight){
self.rightStartPoint = [gesture locationInView:self];
_isDraggingRightOverlayView = YES;
_isDraggingLeftOverlayView = NO;
}
else if (isLeft){
self.leftStartPoint = [gesture locationInView:self];
_isDraggingRightOverlayView = NO;
_isDraggingLeftOverlayView = YES;
}
}
break;
case UIGestureRecognizerStateChanged:
{
if (CMTimeGetSeconds([self.asset duration]) <= self.minLength) { return;
}
CGPoint point = [gesture locationInView:self]; //------------------------------------------------------------------------------------------------------------
// Right
if (_isDraggingRightOverlayView){
CGFloat deltaX = point.x - self.rightStartPoint.x;
CGPoint center = self.rightOverlayView.center;
center.x += deltaX; CGFloat newRightViewMidX = center.x; CGFloat minX = CGRectGetMaxX(self.leftOverlayView.frame) + self.minLength * self.widthPerSecond; CGFloat maxX = CMTimeGetSeconds([self.asset duration]) <= self.maxLength + 0.5 ? CGRectGetMaxX(self.frameView.frame) : CGRectGetWidth(self.frame) - self.thumbWidth; if (newRightViewMidX - self.overlayWidth/2 < minX) {
newRightViewMidX = minX + self.overlayWidth/2; //
[self showNoSmallerTrimMessage];
} else if (newRightViewMidX - self.overlayWidth/2 > maxX) {
newRightViewMidX = maxX + self.overlayWidth/2;
}
self.rightOverlayView.center = CGPointMake(newRightViewMidX, self.rightOverlayView.center.y); self.rightStartPoint = point;
} else if (_isDraggingLeftOverlayView){
//------------------------------------------------------------------------------------------------------------
// Left
CGFloat deltaX = point.x - self.leftStartPoint.x;
CGPoint center = self.leftOverlayView.center;
center.x += deltaX;
CGFloat newLeftViewMidX = center.x;
CGFloat maxWidth = CGRectGetMinX(self.rightOverlayView.frame) - (self.minLength * self.widthPerSecond); CGFloat newLeftViewMinX = newLeftViewMidX - self.overlayWidth/2; if (newLeftViewMinX < self.thumbWidth - self.overlayWidth) {
newLeftViewMidX = self.thumbWidth - self.overlayWidth + self.overlayWidth/2;
} else if (newLeftViewMinX + self.overlayWidth > maxWidth) {
newLeftViewMidX = maxWidth - self.overlayWidth / 2; //
[self showNoSmallerTrimMessage];
}
self.leftOverlayView.center = CGPointMake(newLeftViewMidX, self.leftOverlayView.center.y); self.leftStartPoint = point;
} //------------------------------------------------------------------------------------------------------------
[self updateBorderFrames];
[self notifyDelegateOfDidChange];
break;
}
case UIGestureRecognizerStateEnded:
{
if (CMTimeGetSeconds([self.asset duration]) <= self.minLength) { return;
}
[self notifyDelegateOfEndEditing];
}
default:
break;
}
}监听左右滑动距离，显示时间即为要裁剪的视频区间段。
- (void)trimmerView:(SNHVideoTrimmerView *)trimmerView didChangeLeftPosition:(CGFloat)startTime rightPosition:(CGFloat)endTime
{
_restartOnPlay = YES;
[self.player pause]; self.isPlaying = NO;
self.playBtn.hidden = NO;
[self stopPlaybackTimeChecker];
[self.trimmerView hideTracker:true];
if (startTime != self.startTime) {
//then it moved the left position, we should rearrange the bar
[self seekVideoToPos:startTime];
} else{ // right has changed
[self seekVideoToPos:endTime];
} self.startTime = startTime;
self.stopTime = endTime;
}(2).视频转换格式（mp4,mov,gif）
我们用手机录制视频时，一般格式为mov,所以我们就需要格式转化。
//转化为mov,mp4时
exporter.outputFileType = [self transOutPutFileType:fileType];
//导出的视频格式类型- (NSString *)transOutPutFileType:(NSString *)fileType {
if ([fileType isEqualToString:@"mov"]) {
return AVFileTypeQuickTimeMovie;
}else if ([fileType isEqualToString:@"mp4"]) {
return AVFileTypeMPEG4;
}else {
return AVFileTypeQuickTimeMovie;
}
}//mov转化为GIF(视频转化为图片，图片转化为GIF图)
//把视频转换成图片数组- (void)creatAvasset:(AVAsset *)asset{
AVAssetImageGenerator *imagegenerator = [AVAssetImageGenerator assetImageGeneratorWithAsset:asset]; CMTime time = asset.duration;
NSInteger totalTimer = (NSInteger)CMTimeGetSeconds(time); //总共要取的张数
NSInteger totalCount = 0;
//最多取的时常
if (totalTimer > Maxsconds) {
self.animationTimer = Maxsconds;
totalCount = Maxsconds * FTPNumber;
}else{
self.animationTimer = totalTimer;
totalCount = totalTimer * FTPNumber;
}
NSMutableArray *timeArray = [NSMutableArray array];
for (NSInteger i = 0; i < totalCount; i++) {
CMTime timeFrame = CMTimeMake(i, FTPNumber);
NSValue *timeValue = [NSValue valueWithCMTime:timeFrame];
[timeArray addObject:timeValue];
} //防止出现偏差
imagegenerator.requestedTimeToleranceBefore = kCMTimeZero;
imagegenerator.requestedTimeToleranceAfter = kCMTimeZero;
[self.totalImageArray removeAllObjects];
//转换成图片
[imagegenerator generateCGImagesAsynchronouslyForTimes:timeArray completionHandler:^(CMTime requestedTime, CGImageRef _Nullable image, CMTime actualTime, AVAssetImageGeneratorResult result, NSError * _Nullable error) {
switch (result) {
case AVAssetImageGeneratorFailed:
{ //获取失败
NSLog(@"获取失败");
} break;
case AVAssetImageGeneratorCancelled:
{// 获取已取消
NSLog(@"获取已经取消");
}
break;
case AVAssetImageGeneratorSucceeded:
{// 获取成功
NSData *data = UIImageJPEGRepresentation([UIImage imageWithCGImage:image], 0.6);
[self.totalImageArray addObject:data];
if ( requestedTime.value >= totalCount -1) {
dispatch_async(dispatch_get_main_queue(), ^{
if (self.blockVideo) {
self.blockVideo(@"成功处理");
//随便处理生产一个gif
[self ImageArrayToGif];
}
});
}
}
break;
default:
break;
}
}];
}//把图片转成gif
-(void)ImageArrayToGif{
NSMutableArray * images= [NSMutableArray array];
for (NSData *dataImage in self.totalImageArray) {
[images addObject:[UIImage imageWithData:dataImage]];
}//生成载gif的文件在Document中
NSString *path = [self creatPathGif];
self.gifPath = path; //配置gif属性
CGImageDestinationRef destion;
CFURLRef url = CFURLCreateWithFileSystemPath(kCFAllocatorDefault, (CFStringRef)path, kCFURLPOSIXPathStyle, false);
destion = CGImageDestinationCreateWithURL(url, kUTTypeGIF, images.count, NULL);
NSDictionary *frameDic = [NSDictionary dictionaryWithObject:[NSMutableDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithFloat:0.3],(NSString*)kCGImagePropertyGIFDelayTime, nil] forKey:(NSString*)kCGImagePropertyGIFDelayTime];
NSMutableDictionary *gifParmdict = [NSMutableDictionary dictionaryWithCapacity:2]; //颜色
[gifParmdict setObject:[NSNumber numberWithBool:YES] forKey:(NSString*)kCGImagePropertyGIFHasGlobalColorMap];// 颜色类型
[gifParmdict setObject:(NSString*)kCGImagePropertyColorModelRGB forKey:(NSString*)kCGImagePropertyColorModel];// 颜色深度
[gifParmdict setObject:[NSNumber numberWithInt:8] forKey:(NSString*)kCGImagePropertyDepth];// 是否重复
[gifParmdict setObject:[NSNumber numberWithInt:0] forKey:(NSString*)kCGImagePropertyGIFLoopCount];
NSDictionary *gifProperty = [NSDictionary dictionaryWithObject:gifParmdict forKey:(NSString*)kCGImagePropertyGIFDictionary];// 合成gif
for (UIImage *dimage in images) {
//可以在这里对图片进行压缩
CGImageDestinationAddImage(destion, dimage.CGImage, (__bridge CFDictionaryRef)frameDic);
}
CGImageDestinationSetProperties(destion,(__bridge CFDictionaryRef)gifProperty);
CGImageDestinationFinalize(destion);
CFRelease(destion);
if(self.getGifPath){
self.getGifPath(path);
}
}(3).视频压缩
AVAssetExportPresetLowQuality 低质量 可以通过移动网络分享 AVAssetExportPresetMediumQuality 中等质量 可以通过WIFI网络分享 AVAssetExportPresetHighestQuality 高等质量
关键代码为：
- (void) sliderChange:(id) sender {
if ([sender isKindOfClass:[UISlider class]]) {
UISlider * slider = sender;
int value = slider.value;
if(value<=30){
_compressType = AVAssetExportPresetLowQuality;
}else if (value>30&&value<=70){
_compressType = AVAssetExportPresetMediumQuality;
}else
{
_compressType = AVAssetExportPresetHighestQuality;
} if(self.fileSize*value/100>1024){
_targetTitle.text = [NSString stringWithFormat:@"Target size: %@(%d)%%",[NSString stringWithFormat:@"%d MB",(int)self.fileSize*value/100/1024],value];
}else
{
_targetTitle.text = [NSString stringWithFormat:@"Target size: %@(%d)%%",[NSString stringWithFormat:@"%d Kb",(int)self.fileSize*value/100],value];
}
}
}四.视频导出
当我们完成上述的功能后，需要保存新得到的视频，我们要先把新的视频导出，然后保存到本地。
//5.视频输出
self.outputURL = [NSURL fileURLWithPath: self.outPutPath];
AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset:
self.mixComposition presetName:self.presetName];
exporter.outputURL = self.outputURL;
exporter.videoComposition = self.videoComposition;
exporter.outputFileType = [self transOutPutFileType:fileType];
exporter.shouldOptimizeForNetworkUse = self.shouldOptimizeForNetworkUse;
[exporter exportAsynchronouslyWithCompletionHandler:^{
dispatch_async(dispatch_get_main_queue(), ^{
if (exporter.status == AVAssetExportSessionStatusCompleted) {
if (successBlock) {
successBlock(self.outputURL);
}
}else{
NSLog(@"exporter %@",exporter.error);
if (failureBlock) {
failureBlock(exporter.error);
}
}
});
}];具体实现请参考demo下载地址，如有错误，请评论指出！相互学习！
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