kcv

iOS视频合成（图⽚和视频的合成，视频跟⾳频的合成）

这个给我的感觉就像是PPT播放⼀样。这⾥找了⼀些资料，学习视频合成⽅⾯的知识。

⼀：图⽚和视频的合成：

@interfaceViewController()

@property(nonatomic,strong)NSMutableArray*imageArr;

@property(nonatomic,strong)NSString*theVideoPath;

@end

@implementationViewController

-(void)viewDidLoad{

[superviewDidLoad];

rr=[[NSMutableArrayalloc]initWithObjects:

[UIImageimageNamed:@""],[UIImageimageNamed:@""],[UIImageimageNamed:@""],[UIImage

imageNamed:@""],[UIImageimageNamed:@""],[UIImageimageNamed:@""],[UIImage

imageNamed:@"7"],[UIImageimageNamed:@"8"],[UIImageimageNamed:@""],[UIImage

imageNamed:@""],[UIImageimageNamed:@""],[UIImageimageNamed:@""],[UIImage

imageNamed:@""],[UIImageimageNamed:@""],[UIImageimageNamed:@""],[UIImage

imageNamed:@""],[UIImageimageNamed:@""],[UIImageimageNamed:@""],[UIImage

imageNamed:@""],[UIImageimageNamed:@""],[UIImageimageNamed:@""],[UIImage

imageNamed:@""],[UIImageimageNamed:@""],nil];

UIButton*button=[UIButtonbuttonWithType:UIButtonTypeRoundedRect];

[buttontFrame:CGRectMake(100,100,100,100)];

[buttontTitle:@"合成"forState:UIControlStateNormal];

[buttonaddTarget:lf

action:@lector(testCompressionSession)forControlEvents:UIControlEventTouchUpInside];

[dSubview:button];

UIButton*button1=[UIButtonbuttonWithType:UIButtonTypeRoundedRect];

[button1tFrame:CGRectMake(100,200,100,100)];

[button1tTitle:@"播放"forState:UIControlStateNormal];

[button1addTarget:lfaction:@lector(playAction)forControlEvents:UIControlEventTouchUpInside];

[dSubview:button1];

//Doanyadditionaltupafterloadingtheview,typicallyfromanib.

}

-(void)testCompressionSession

{

NSLog(@"开始");

//NSString*moviePath=[[NSBundlemainBundle]pathForResource:@"Movie"ofType:@"mov"];

NSArray*paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUrDomainMask,YES);

NSString*moviePath=[[pathsobjectAtIndex:0]stringByAppendingPathComponent:[NSString

stringWithFormat:@"%@.mp4",@"2016全球三⼤超跑宣传⽚_超清"]];

eoPath=moviePath;

CGSizesize=CGSizeMake(320,400);//定义视频的⼤⼩

//[lfwriteImages:_imageArrToMovieAtPath:moviePathwithSize:sizeinDuration:4byFPS:30];//第2中⽅法

NSError*error=nil;

unlink([moviePathUTF8String]);

NSLog(@"path->%@",moviePath);

//—-initializecompressionengine

AVAstWriter*videoWriter=[[AVAstWriteralloc]initWithURL:[NSURL

fileURLWithPath:moviePath]fileType:AVFileTypeQuickTimeMovieerror:&error];

NSParameterAsrt(videoWriter);

if(error)

NSLog(@"error=%@",[errorlocalizedDescription]);

NSDictionary*videoSettings=[NSDictionary

dictionaryWithObjectsAndKeys:AVVideoCodecH264,AVVideoCodecKey,

[NSNumbernumberWithInt:],AVVideoWidthKey,

[NSNumbernumberWithInt:],AVVideoHeightKey,nil];

AVAstWriterInput*writerInput=[AVAstWriterInputastWriterInputWithMediaType:AVMediaTypeVideo

outputSettings:videoSettings];

NSDictionary*sourcePixelBufferAttributesDictionary=[NSDictionarydictionaryWithObjectsAndKeys:

[NSNumbernumberWithInt:kCVPixelFormatType_32ARGB],kCVPixelBufferPixelFormatTypeKey,nil];

AVAstWriterInputPixelBufferAdaptor*adaptor=[AVAstWriterInputPixelBufferAdaptor

astWriterInputPixelBufferAdaptorWithAstWriterInput:writerInput

sourcePixelBufferAttributes:sourcePixelBufferAttributesDictionary];

NSParameterAsrt(writerInput);

NSParameterAsrt([videoWritercanAddInput:writerInput]);

if([videoWritercanAddInput:writerInput])

NSLog(@"11111");

el

NSLog(@"22222");

[videoWriteraddInput:writerInput];

[videoWriterstartWriting];

[videoWriterstartSessionAtSourceTime:kCMTimeZero];

//合成多张图⽚为⼀个视频⽂件

dispatch_queue_tdispatchQueue=dispatch_queue_create("mediaInputQueue",NULL);

int__blockframe=0;

[writerInputrequestMediaDataWhenReadyOnQueue:dispatchQueueusingBlock:^{

while([writerInputisReadyForMoreMediaData])

{

if(++frame>=[rrcount]*10)

{

[writerInputmarkAsFinished];

[videoWriterfinishWriting];

break;}

CVPixelBufferRefbuffer=NULL;

intidx=frame/10;

NSLog(@"idx==%d",idx);

buffer=(CVPixelBufferRef)

[lfpixelBufferFromCGImage:[[rrobjectAtIndex:idx]CGImage]size:size];

if(buffer){

if(![adaptorappendPixelBuffer:bufferwithPrentationTime:CMTimeMake(frame,10)])

NSLog(@"FAIL");

el

NSLog(@"OK");

CFRelea(buffer);}}}];}

-(CVPixelBufferRef)pixelBufferFromCGImage:(CGImageRef)imagesize:(CGSize)size{

NSDictionary*options=[NSDictionarydictionaryWithObjectsAndKeys:

[NSNumbernumberWithBool:YES],kCVPixelBufferCGImageCompatibilityKey,

[NSNumbernumberWithBool:YES],kCVPixelBufferCGBitmapContextCompatibilityKey,nil];

CVPixelBufferRefpxbuffer=NULL;

CVReturnstatus

=CVPixelBufferCreate(kCFAllocatorDefault,,,kCVPixelFormatType_32ARGB,(__bridge

CFDictionaryRef)options,&pxbuffer);

NSParameterAsrt(status==kCVReturnSuccess&&pxbuffer!=NULL);

CVPixelBufferLockBaAddress(pxbuffer,0);

void*pxdata=CVPixelBufferGetBaAddress(pxbuffer);

NSParameterAsrt(pxdata!=NULL);

CGColorSpaceRefrgbColorSpace=CGColorSpaceCreateDeviceRGB();

CGContextRefcontext

=CGBitmapContextCreate(pxdata,,,8,4*,rgbColorSpace,kCGImageAlphaPremul

tipliedFirst);

NSParameterAsrt(context);

CGContextDrawImage(context,CGRectMake(0,0,CGImageGetWidth(image),CGImageGetHeight(image)),

image);

CGColorSpaceRelea(rgbColorSpace);

CGContextRelea(context);

CVPixelBufferUnlockBaAddress(pxbuffer,0);

returnpxbuffer;}

-(void)playAction{

MPMoviePlayerViewController*theMovie=[[MPMoviePlayerViewControlleralloc]initWithContentURL:

[NSURLfileURLWithPath:eoPath]];

[lfprentMoviePlayerViewControllerAnimated:theMovie];

ourceType=MPMovieSourceTypeFile;[layerplay];}

//第⼆种⽅式

-(void)writeImages:(NSArray*)imagesArrayToMovieAtPath:(NSString*)pathwithSize:(CGSize)size

inDuration:(float)durationbyFPS:(int32_t)fps{

//Wirethewriter:

NSError*error=nil;

AVAstWriter*videoWriter=[[AVAstWriteralloc]initWithURL:[NSURL

fileURLWithPath:path]fileType:AVFileTypeQuickTimeMovieerror:&error];

NSParameterAsrt(videoWriter);

NSDictionary*videoSettings=[NSDictionarydictionaryWithObjectsAndKeys:

AVVideoCodecH264,AVVideoCodecKey,

[NSNumbernumberWithInt:],AVVideoWidthKey,

[NSNumbernumberWithInt:],AVVideoHeightKey,nil];

AVAstWriterInput*videoWriterInput=[AVAstWriterInput

astWriterInputWithMediaType:AVMediaTypeVideooutputSettings:videoSettings];

AVAstWriterInputPixelBufferAdaptor*adaptor=

[AVAstWriterInputPixelBufferAdaptorastWriterInputPixelBufferAdaptorWithAstWriterInput:videoWri

terInputsourcePixelBufferAttributes:nil];

NSParameterAsrt(videoWriterInput);

NSParameterAsrt([videoWritercanAddInput:videoWriterInput]);

[videoWriteraddInput:videoWriterInput];

//Startassion:

[videoWriterstartWriting];

[videoWriterstartSessionAtSourceTime:kCMTimeZero];

//Writesomesamples:

CVPixelBufferRefbuffer=NULL;

intframeCount=0;

intimagesCount=[imagesArraycount];

floataverageTime=duration/imagesCount;

intaverageFrame=(int)(averageTime*fps);

for(UIImage*imginimagesArray){

buffer=[lfpixelBufferFromCGImage:[imgCGImage]size:size];

BOOLappend_ok=NO;

intj=0;

while(!append_ok&&j<=30)

{

if(orMoreMediaData)

{

printf("appending%dattemp%dn",frameCount,j);

CMTimeframeTime=CMTimeMake(frameCount,(int32_t)fps);floatframeSeconds

=CMTimeGetSeconds(frameTime);

NSLog(@"frameCount:%d,kRecordingFPS:%d,frameSeconds:%f",frameCount,fps,frameSeconds);

append_ok=[adaptorappendPixelBuffer:bufferwithPrentationTime:frameTime];

if(buffer)

[NSThreadsleepForTimeInterval:0.05];}el{

printf("adaptornotready%d,%dn",frameCount,j);

[NSThreadsleepForTimeInterval:0.1];}

j++;}

if(!append_ok){

printf("errorappendingimage%dtimes%dn",frameCount,j);}

frameCount=frameCount+averageFrame;}

//Finishthession:

[videoWriterInputmarkAsFinished];

[videoWriterfinishWriting];NSLog(@"finishWriting");}

⼆：视频跟⾳频的合成

//混合⾳乐

-(void)merge{

//mbp提⽰框

//[MBProgressHUDshowMessage:@"正在处理中"];

//路径

NSString*documents=[NSHomeDirectory()stringByAppendingPathComponent:@"Documents"];

//声⾳来源

NSURL*audioInputUrl=[NSURLfileURLWithPath:[[NSBundlemainBundle]pathForResource:@"蓝瘦⾹菇"

ofType:@"mp3"]];

//视频来源

NSURL*videoInputUrl=[NSURLfileURLWithPath:[[NSBundlemainBundle]pathForResource:@"2016全球三

⼤超跑宣传⽚_超清"ofType:@"mp4"]];

//最终合成输出路径

NSString*outPutFilePath=[documentsstringByAppendingPathComponent:@"4"];

//添加合成路径

NSURL*outputFileUrl=[NSURLfileURLWithPath:outPutFilePath];

//时间起点

CMTimenextClistartTime=kCMTimeZero;

//创建可变的⾳视频组合

AVMutableComposition*comosition=[AVMutableCompositioncomposition];

//视频采集

AVURLAst*videoAst=[[AVURLAstalloc]initWithURL:videoInputUrloptions:nil];

//视频时间范围

CMTimeRangevideoTimeRange=CMTimeRangeMake(kCMTimeZero,on);

//视频通道枚举kCMPersistentTrackID_Invalid=0

AVMutableCompositionTrack*videoTrack=[comosition

addMutableTrackWithMediaType:AVMediaTypeVideopreferredTrackID:kCMPersistentTrackID_Invalid];

//视频采集通道

AVAstTrack*videoAstTrack=[[videoAsttracksWithMediaType:AVMediaTypeVideo]firstObject];

//把采集轨道数据加⼊到可变轨道之中

[videoTrackinrtTimeRange:videoTimeRangeofTrack:videoAstTrackatTime:nextClistartTimeerror:nil];

//声⾳采集

AVURLAst*audioAst=[[AVURLAstalloc]initWithURL:audioInputUrloptions:nil];

//因为视频短这⾥就直接⽤视频长度了,如果⾃动化需要⾃⼰写判断

CMTimeRangeaudioTimeRange=videoTimeRange;

//⾳频通道

AVMutableCompositionTrack*audioTrack=[comosition

addMutableTrackWithMediaType:AVMediaTypeAudiopreferredTrackID:kCMPersistentTrackID_Invalid];

//⾳频采集通道

AVAstTrack*audioAstTrack=[[audioAsttracksWithMediaType:AVMediaTypeAudio]firstObject];

//加⼊合成轨道之中

[audioTrackinrtTimeRange:audioTimeRangeofTrack:audioAstTrackatTime:nextClistartTimeerror:nil];

//创建⼀个输出

AVAstExportSession*astExport=[[AVAstExportSessionalloc]initWithAst:comosition

pretName:AVAstExportPretMediumQuality];

//输出类型

FileType=AVFileTypeQuickTimeMovie;

//输出地址

URL=outputFileUrl;

//优化

OptimizeForNetworkU=YES;

//合成完毕

[astExportexportAsynchronouslyWithCompletionHandler:^{

//回到主线程

dispatch_async(dispatch_get_main_queue(),^{

//调⽤播放⽅法outputFileUrl这个就是合成视频跟⾳频的视频

[lfplayWithUrl:outputFileUrl];

});

}];

}