1，首先我们要做视频导出合并这些基本的操作
这部分代码网上都有基本都是比较简单没什么坑，首先导入视频地址，拿到AVAsset,然后利用AVMutableComposition去配置合并就行了
NSDictionary*optDict = [NSDictionarydictionaryWithObject:[NSNumbernumberWithBool:NO]forKey:AVURLAssetPreferPreciseDurationAndTimingKey];
AVAsset*firstAsset = [[AVURLAssetalloc]initWithURL:((FetchObject*)[videoArraysobjectAtIndex:0]).fileUroptions:optDict];
AVAsset*secondAsset = [[AVURLAssetalloc]initWithURL:((FetchObject*)[videoArraysobjectAtIndex:1]).fileUroptions:optDict];
AVAsset*endedAsset;
if(videoArrays.count>=3)
{
endedAsset= [[AVURLAssetalloc]initWithURL:((FetchObject*)[videoArraysobjectAtIndex:2]).fileUroptions:optDict];
}
AVMutableComposition*composition = [AVMutableCompositioncomposition];
//为视频类型的的Track
AVMutableCompositionTrack*compositionTrack = [compositionaddMutableTrackWithMediaType:AVMediaTypeVideopreferredTrackID:kCMPersistentTrackID_Invalid];
//CMTimeRangeMake 指定起去始位置
CMTimeRangefirstTimeRange =CMTimeRangeMake(kCMTimeZero, firstAsset.duration);
CMTimeRangesecondTimeRange =CMTimeRangeMake(kCMTimeZero, secondAsset.duration);
CMTimeRangeendedTimeRange=CMTimeRangeMake(kCMTimeZero, endedAsset.duration);
[compositionTrackinsertTimeRange:firstTimeRangeofTrack:[firstAssettracksWithMediaType:AVMediaTypeVideo][0]atTime:kCMTimeZeroerror:nil];
[compositionTrackinsertTimeRange:secondTimeRangeofTrack:[secondAssettracksWithMediaType:AVMediaTypeVideo][0]atTime:firstTimeRange.durationerror:nil];
if(endedAsset!=nil)
{
[compositionTrackinsertTimeRange:endedTimeRangeofTrack:[endedAssettracksWithMediaType:AVMediaTypeVideo][0]atTime:secondTimeRange.durationerror:nil];
}
//只合并视频，导出后声音会消失，所以需要把声音插入到混淆器中
//添加音频,添加本地其他音乐也可以,与视频一致
AVMutableCompositionTrack*audioTrack = [compositionaddMutableTrackWithMediaType:AVMediaTypeAudiopreferredTrackID:kCMPersistentTrackID_Invalid];
if([firstAssettracksWithMediaType:AVMediaTypeAudio].count>0)
{
[audioTrackinsertTimeRange:firstTimeRangeofTrack:[firstAssettracksWithMediaType:AVMediaTypeAudio][0]atTime:kCMTimeZeroerror:nil];
}
//CMTimeRange totalTimeRange=CMTimeRangeMake(kCMTimeZero,CMTimeAdd(CMTimeAdd(secondTimeRange.duration, firstTimeRange.duration), endedTimeRange.duration));
if([secondAssettracksWithMediaType:AVMediaTypeAudio].count>0)
{
[audioTrackinsertTimeRange:secondTimeRangeofTrack:[secondAssettracksWithMediaType:AVMediaTypeAudio][0]atTime:firstAsset.durationerror:nil];
}
if(endedAsset!=nil)
{
if([endedAssettracksWithMediaType:AVMediaTypeAudio].count>0) {
[audioTrackinsertTimeRange:endedTimeRangeofTrack:[endedAssettracksWithMediaType:AVMediaTypeAudio][0]atTime:secondAsset.durationerror:nil];
}
}
拆分配置好后可以用AVAssetExportSession 导出
exporterSession= [[AVAssetExportSessionalloc]initWithAsset:compositionpresetName:AVAssetExportPreset1280x720];
if(videoComposition!=nil) {
exporterSession.videoComposition=videoComposition;
}
exporterSession.outputFileType=AVFileTypeQuickTimeMovie;
//混合后的视频输出路径
NSString*outPutPath =MERAGVIDEOPATH;
if([[NSFileManagerdefaultManager]fileExistsAtPath:outPutPath])
{
[[NSFileManagerdefaultManager]removeItemAtPath:outPutPatherror:nil];
}
NSURL*outPutUrl = [NSURLfileURLWithPath:outPutPath];
exporterSession.outputURL= outPutUrl;//如果文件已存在，将造成导出失败
exporterSession.shouldOptimizeForNetworkUse=YES;//用于互联网传输
[exporterSessionexportAsynchronouslyWithCompletionHandler:^{
2.我们可以利用gpuimage 第三方框架做滤镜(这里面有很多坑。。)
gpuimage 是个老外写的滤镜第三方库支持图片和视频 https://github.com/BradLarson/GPUImage
首先第一个坑: 美工给你什么做滤镜，最好要你们美工导出oringal lookup table格子图 就是gpuimage里面有的让你们美工按照你们需要的滤镜调用ps导出
fitler=[[GPUImageFilteralloc]init];
self.filterLookup= [[GPUImageLookupFilteralloc]init];
self.lookupImageSource= [[GPUImagePicturealloc]initWithImage:[UIImageimageNamed:@"N1.png"]];
[self.lookupImageSourceaddTarget:self.filterLookupatTextureLocation:1];
[self.lookupImageSourceuseNextFrameForImageCapture];
[self.lookupImageSourceprocessImage];
fitler=self.filterLookup;
这样子你就可以配置出一个你需要的滤镜fitler
然后你要播放预览加了滤镜的视频
我们不能用传统的播放器，我们需要自己写一个播放器，需要用到avplayer 和avplayeritem,还有GPUImageMovie gpuimage的本地视频播放
- (void)setFitlerView:(GPUImageFilter*)fitler{
_avplayer=[[AVPlayeralloc]init];
_avplayerItem=[[AVPlayerItemalloc]initWithURL:_videoUrl];
[_avplayerreplaceCurrentItemWithPlayerItem:_avplayerItem];
[selfsetFillMode:kGPUImageFillModePreserveAspectRatioAndFill];
_movieFile=[[GPUImageMoviealloc]initWithPlayerItem:_avplayerItem];
_movieFile.url=_videoUrl;
[_movieFilesetPlayAtActualSpeed:YES];
[_movieFilesetShouldRepeat:YES];
[_movieFileaddTarget:fitler];
[fitleraddTarget:self];
[_movieFilestartProcessing];
[_avplayerplay];
}
3.添加音乐，这个用原生avfoundation,
4.添加水印动画（这里面也有很多坑。。）
