iOS AVFoundation 视频添加的水印，动画

作者: 秋叶红90 | 来源:发表于2020-06-06 00:39 被阅读0次

iOS AVFoundation 视频添加的水印，动画
[iOS] 视频添加动效水印实现介绍
iOS粒子特效、仿微信朋友圈、转场动画、抢红包动画等源码
『ios』视频编辑入门【画中画实现】改变视频尺寸与图片并排放置
[iOS] 视频添加动效水印实现介绍
【iOS学习】视频添加动效水印步骤简介
短视频从无到有 (四)视频添加水印
iOS音视频及相机相关
FFMpeg常用指令
AVFoundation教程：给视频添加边框、水印、动画以及3D

composition.animationTool = AVVideoCompositionCoreAnimationTool.init(postProcessingAsVideoLayer: videoLayer, in: parentLayer)

AVVideoCompositionCoreAnimationTool 此类专门为视频添加动画，
而且只针对parentLayer 子类才能做动画，包括videoLayer 和其他layer 但是不包括更下一级的子类

AVFoundation framework提供了丰富的功能类以便于编辑资源的音视频。

AVAsset:素材库里的素材;
AVAssetTrack:素材的轨道;
AVFoundation编辑API的核心就是compositions(合成);
composition就是从一个或多个不同的资源中获取到的简单的track(轨道)的集合;
AVMutableComposition:一个用来合成视频的工程文件;
AVMutableCompositionTrack:工程文件中的轨道，有有音频轨、视频轨等，里面可以插入各种对应的素材;
AVMutableVideoCompositionLayerInstruction:视频轨道中的一个视频，可以缩放、旋转等;
AVMutableVideoCompositionInstruction:一个视频轨道，包含了这个轨道上的所有视频素材;
AVMutableVideoCompositionInstruction和AVMutableVideoCompositionLayerInstruction一般是配合使用，用来给视频添加水印或者旋转方向的;
AVMutableVideoComposition:管理所有视频轨道，可以决定最终视频的尺寸，裁剪需要在这里进行;
AVMutableAudioMix是给视频添加音频的;
AVAssetExportSession:配置渲染参数并渲染。
你可以使用AVMutableAudioMix类编辑你的音频track。比如你可以设置最大音量以及音轨坡度。
你可以使用AVMutableVideoComposition类直接编辑视频轨道。

创建Composition

你可以使用AVMutableComposition类创建composition。你必须添加一个或多个composition track到你的composition里，相当于使用AVMutableCompositionTrack类。最简单的composition就是一个视频一个音频track。

let mutableComposition = AVMutableComposition()
    let mutableCompositionVideoTrack = mutableComposition.addMutableTrackWithMediaType(AVMediaTypeVideo, preferredTrackID: kCMPersistentTrackID_Invalid) //视频轨道
    let mutableCompositionAudioTrack = mutableComposition.addMutableTrackWithMediaType(AVMediaTypeAudio, preferredTrackID: kCMPersistentTrackID_Invalid) //音频轨道

多种方式初始化Composition Track
当添加新的track到composition，你必须提供媒体类型和Track ID。尽管音视频是我们常用额媒体的类型，但是同样，我们可以使用其他类型，比如AVMediaTypeSubtitle或AVMediaTypeText.

添加试听数据到Composition
一旦你的composition有一个或者多个tracks，你可以添加新的数据到合适的tracks上。你可以使用可变的composition接口放置多个曲目相同的底层媒体类型在同一轨道上。

let videoAsset = AVAsset(URL:NSURL(string:"http://140.207.205.6/sohu/v1/TmwmTmxATmXG9vhNXRDFk9CBJpakEWJmopXAOCkytHrChWoIymcAr.mp4?k=mlU3Gr&p=j9lvzSwUopPGqmwCoSwGqSoCqpXWsUwIWFo7oB2svm12ZDeS0tvGRD6sWYNsfY1svmfCZMbVwmfVZD6HfYXswmNCNF2OWYdXfGN4wm6AZDNXfY1swm1BqVPcgYeSoMAARDx&r=TmI20LscWOoUgt8IS3HTaI2yT8XPLNGWVEt88eILOfkHkg9kjdxLYf9SlZEmrW49JLzSxm0KOyOHXIY&q=OpC7hW7IWJodRDbOwmfCyY2sWF1HfJ1tlG6t5G64WYo2ZDv4fFesWGNOwm4cWhbOvmscWY&cip=140.207.16.150")!)  //视频资源1

 let anotherAsset = AVAsset(URL: NSURL(string: "http://data.vod.itc.cn/?new=/218/117/QH0duE89EFks1QWyHBshuL.mp4&vid=3088596&plat=17&mkey=CLfbS51YewD-mLXpGv4ZyKSwDrzD1heG&ch=tv&uid=1602171411153447&SOHUSVP=EtzMYkA639BAKmIufcqZ2lpZcDeNMTd-V15MB1rYf9k&pt=5&prod=h5&pg=1&eye=0&cv=1.0.0&qd=68000&src=11060001&ca=4&cateCode=115&_c=1&appid=tv&oth=&cd=")!) //视频资源2
    let videoAssetTrack = videoAsset.tracksWithMediaType(AVMediaTypeVideo)[0] as AVAssetTrack //视频资源1的视频轨
    let anotherVideoAssetTrack = anotherAsset.tracksWithMediaType(AVMediaTypeVideo)[0] as AVAssetTrack //视频资源2的视频轨
    //
    try! mutableCompositionVideoTrack.insertTimeRange(CMTimeRangeMake(kCMTimeZero, videoAssetTrack.timeRange.duration), ofTrack: videoAssetTrack, atTime: kCMTimeZero) //在视频轨道里插入视频资源1的视频轨
    try! mutableCompositionVideoTrack.insertTimeRange(CMTimeRangeMake(kCMTimeZero, anotherVideoAssetTrack.timeRange.duration), ofTrack: anotherVideoAssetTrack, atTime: videoAssetTrack.timeRange.duration) ////在视频轨道里插入视频资源2的视频轨。
    //这样两个视频轨道就合成到一个视频轨道里了！！

检索兼容的composition tracks

可能的话，你应该只有唯一的composition track 对应每个媒体类型。统一资源的兼容能使资源使用最小化。当连续地呈现媒体数据的时候，你应该将相同媒体类型的数据放到相同的composition track(组合曲目)里。你可以对可变的composition里查找你的composition tracks是否兼容你想要的那个资源曲目：


let compatibleCompositiontrack = mutableComposition.mutableTrackCompatibleWithTrack(videoAssetTrack)

    if (compatibleCompositiontrack != nil) {
        //
    }

生成音量坡度

一个AVMutableAudioMix对象可以在你的composition所有音频track里单独执行自定义音频处理。你通过audioMix类方法创建一个audio mix(音频混合)，然后使用AVMutableAudioMixInputParameters的实例将audio mix与你composition里的指定track进行关联。audio mix可以被用于改变audio track的音量:


let mutableAudioMix = AVMutableAudioMix()
    let mixParamters = AVMutableAudioMixInputParameters(track: mutableCompositionAudioTrack)
    mixParamters.setVolumeRampFromStartVolume(1.0, toEndVolume: 0.0, timeRange:CMTimeRangeMake(kCMTimeZero, mutableComposition.duration))
    mutableAudioMix.inputParameters = [mixParamters]

自定义视频处理

对应audio mix，你也只需要一个AVMutableVideoComposition对象在你的composition里所有视频track里单独执行自定义视频处理。你可以使用视频composition直接为你的视频track设置size、scale、frame rate。

改变composition的背景色

所有的视频composition必须有包含至少一组视频合成指令的AVVideoCompositionInstruction数组，你可以使用AVMutableVideoCompositionInstruction创建自己的视频合成指令。利用视频合成指令，你可以修改构图的背景颜色，指定是否需要处理或者应用层指令。

//改变背景色
    let mutableVideoCompositionInstuction = AVMutableVideoCompositionInstruction()
    mutableVideoCompositionInstuction.timeRange = CMTimeRangeMake(kCMTimeZero, mutableComposition.duration)
    mutableVideoCompositionInstuction.backgroundColor = UIColor.redColor().CGColor

应用不透明坡道

视频组合指令也可以被用于视频组合层指令。一个AVMutableVideoCompositionLayerInstruction可以进行转换,转换坡度，不透明和透明度坡度



let mutableComposition = AVMutableComposition()
    let mutableCompositionVideoTrack = mutableComposition.addMutableTrackWithMediaType(AVMediaTypeVideo, preferredTrackID: kCMPersistentTrackID_Invalid)
    let firstVideoAssetk = AVAsset(URL:NSURL(string:"http://data.vod.itc.cn/?new=/218/117/QH0duE89EFks1QWyHBshuL.mp4&vid=3088596&plat=17&mkey=CLfbS51YewD-mLXpGv4ZyKSwDrzD1heG&ch=tv&uid=1602171411153447&SOHUSVP=EtzMYkA639BAKmIufcqZ2lpZcDeNMTd-V15MB1rYf9k&pt=5&prod=h5&pg=1&eye=0&cv=1.0.0&qd=68000&src=11060001&ca=4&cateCode=115&_c=1&appid=tv&oth=&cd=")!)
    let firstVideoAssetTrack = firstVideoAssetk.tracksWithMediaType(AVMediaTypeVideo)[0] as AVAssetTrack
    let firstVideoCompositionInstruction = AVMutableVideoCompositionInstruction()
    firstVideoCompositionInstruction.timeRange = CMTimeRangeMake(kCMTimeZero, firstVideoAssetTrack.timeRange.duration)
    let firstVideoLayerInstruction = AVMutableVideoCompositionLayerInstruction(assetTrack:mutableCompositionVideoTrack)
    firstVideoLayerInstruction.setOpacityRampFromStartOpacity(1, toEndOpacity: 0, timeRange: CMTimeRangeMake(kCMTimeZero, firstVideoAssetTrack.timeRange.duration))

    let secondVideoAssetk = AVAsset(URL:NSURL(string:"http://data.vod.itc.cn/?new=/13/41/ISfD3DLpScKctFu1HKheqB.mp4&amp;vid=3088680&amp;plat=17&amp;mkey=F6E2ruSK6YflEML59DnzvUYrCDunhuIQ&amp;ch=tv&amp;uid=1602171411153447&amp;SOHUSVP=EtzMYkA639AXH-8Jc72Vn_bYjYnF97iVz4-oU02a_pE&amp;pt=5&amp;prod=h5&amp;pg=1&amp;eye=0&amp;cv=1.0.0&amp;qd=68000&amp;src=11060001&amp;ca=4&amp;cateCode=115&amp;_c=1&amp;appid=tv&amp;oth=&amp;cd=")!)
    let secondVideoAssetTrack = secondVideoAssetk.tracksWithMediaType(AVMediaTypeVideo)[0] as AVAssetTrack
    let secondVideoCompositionInstruction = AVMutableVideoCompositionInstruction()
    secondVideoCompositionInstruction.timeRange = CMTimeRangeMake(firstVideoAssetTrack.timeRange.duration,CMTimeAdd(firstVideoAssetTrack.timeRange.duration, secondVideoAssetTrack.timeRange.duration))

    let secondVideoLayerInstruction = AVMutableVideoCompositionLayerInstruction(assetTrack:mutableCompositionVideoTrack)
    secondVideoLayerInstruction.setOpacityRampFromStartOpacity(1, toEndOpacity: 0, timeRange: CMTimeRangeMake(kCMTimeZero, firstVideoAssetTrack.timeRange.duration))

    firstVideoCompositionInstruction.layerInstructions = [firstVideoLayerInstruction]
    secondVideoCompositionInstruction.layerInstructions = [secondVideoLayerInstruction]

    let mutableVideoComposition = AVMutableVideoComposition()
    mutableVideoComposition.instructions = [firstVideoCompositionInstruction,secondVideoCompositionInstruction]
    videoComposition.renderSize = CGSizeMake(300, 200) //裁剪出对应大小
    videoComposition.frameDuration = CMTimeMake(1, 30)

合并核心动画效果
一个合成视频可以通过animationTool属性添加核心动画，通过animationTool,你可以完成类似水印、添加标题、动画覆盖等任务。核心动画有两种使用方式：你可以添加一个单独的核心动画层作为它单独的合成轨道，你也可以将核心动画直接添加到视频帧里。

//待续
例子
ss

//
import UIKit
import AVFoundation
import MobileCoreServices
import AssetsLibrary

//无效

class CompositionViewController: FCFBaseViewController {
var kDateFormatter:NSDateFormatter?
override func viewDidLoad() {
    super.viewDidLoad()
    //工程文件
    let mutableComposition = AVMutableComposition()
    //视频轨道
    let videoCompositionTrack = mutableComposition.addMutableTrackWithMediaType(AVMediaTypeVideo, preferredTrackID: kCMPersistentTrackID_Invalid)
    //音频轨道
    let audioCompositionTrack = mutableComposition.addMutableTrackWithMediaType(AVMediaTypeAudio, preferredTrackID: kCMPersistentTrackID_Invalid)
    //添加资源
//        let firstVideoAssetTrack = AVAsset(URL: NSURL(string: "http://down.treney.com/mov/test.mp4")!).tracksWithMediaType(AVMediaTypeVideo)[0] as AVAssetTrack
    let videoAsset = AVAsset(URL:NSURL(string:"http://down.treney.com/mov/test.mp4")!)
    //视频素材1的视频轨
    let firstVideoAssetTrack = videoAsset.tracksWithMediaType(AVMediaTypeVideo)[0] as AVAssetTrack
    //在视频轨道里插入视频素材1的视频轨
    try! videoCompositionTrack.insertTimeRange(CMTimeRangeMake(kCMTimeZero, firstVideoAssetTrack.timeRange.duration), ofTrack: firstVideoAssetTrack, atTime: kCMTimeZero)

//        let secondVideoAssetTrack = AVAsset(URL: NSURL(string: "http://119.6.239.159/sohu/v1/TmwioEItfBc7R8PRfDAsg4eg0MbG0FyFMTENWEKl5m47fFoGRMNiNw.mp4?k=Qn4Gfr&p=j9lvzSwUopPGqmwCoSwGqSoCqpXWsUwIWFo7oB2svm12ZDeS0tvGRD6sWYNsfY1svmfCZMbVwmfVZD6HfYXswmNCNF2OfO1XWDWOwm6AZDNXfY1swm1BqVPcgYeSoMAARDx&r=TmI20LscWOoUgt8IS3TT9qLEWqTt5YYoWqkTkjysaY24WGeaRJZcfJsXwJoSKODOfoIWDd4wmXAyBj&q=OpCUhW7IWJodRDbOwmfCyY2sWF1HfJ1tlG6t5G64WYo2ZDv4fFeOWJ6Xvm4cRY1SqF2OY&cip=140.207.16.150")!).tracksWithMediaType(AVMediaTypeVideo)[0] as AVAssetTrack
    let anotherAsset = AVAsset(URL: NSURL(string: "http://119.6.239.159/sohu/v1/TmwioEItfBc7R8PRfDAsg4eg0MbG0FyFMTENWEKl5m47fFoGRMNiNw.mp4?k=Qn4Gfr&p=j9lvzSwUopPGqmwCoSwGqSoCqpXWsUwIWFo7oB2svm12ZDeS0tvGRD6sWYNsfY1svmfCZMbVwmfVZD6HfYXswmNCNF2OfO1XWDWOwm6AZDNXfY1swm1BqVPcgYeSoMAARDx&r=TmI20LscWOoUgt8IS3TT9qLEWqTt5YYoWqkTkjysaY24WGeaRJZcfJsXwJoSKODOfoIWDd4wmXAyBj&q=OpCUhW7IWJodRDbOwmfCyY2sWF1HfJ1tlG6t5G64WYo2ZDv4fFeOWJ6Xvm4cRY1SqF2OY&cip=140.207.16.150")!)
    //视频素材2的视频轨
    let secondVideoAssetTrack = anotherAsset.tracksWithMediaType(AVMediaTypeVideo)[0] as AVAssetTrack
    //在视频轨道里插入视频素材2的视频轨
    try! videoCompositionTrack.insertTimeRange(CMTimeRangeMake(kCMTimeZero, secondVideoAssetTrack.timeRange.duration), ofTrack: secondVideoAssetTrack, atTime: firstVideoAssetTrack.timeRange.duration)


//        try! videoCompositionTrack.insertTimeRange(CMTimeRangeMake(kCMTimeZero, firstVideoAssetTrack.timeRange.duration), ofTrack: firstVideoAssetTrack, atTime: kCMTimeZero)
//        try! videoCompositionTrack.insertTimeRange(CMTimeRangeMake(kCMTimeZero, secondVideoAssetTrack.timeRange.duration), ofTrack: secondVideoAssetTrack, atTime: firstVideoAssetTrack.timeRange.duration)
    try! audioCompositionTrack.insertTimeRange(CMTimeRangeMake(kCMTimeZero, CMTimeAdd(firstVideoAssetTrack.timeRange.duration, secondVideoAssetTrack.timeRange.duration)), ofTrack: AVAsset(URL: NSURL(string: "http://tsmusic128.tc.qq.com/37023937.mp3")!).tracksWithMediaType(AVMediaTypeAudio)[0] as AVAssetTrack, atTime: kCMTimeZero)

    //
    var isFirstVideoPortrait = false
    let firstTransform = firstVideoAssetTrack.preferredTransform
    if firstTransform.a == 0 && firstTransform.d == 0 && (firstTransform.b == 1.0 || firstTransform.b == -1.0) && (firstTransform.c == 1.0 || firstTransform.c == -1.0) {
        isFirstVideoPortrait = true
    }
    var isSecondVideoPortrait = false
    let secondTransform = secondVideoAssetTrack.preferredTransform
    if secondTransform.a == 0 && secondTransform.d == 0 && (secondTransform.b == 1.0 || secondTransform.b == -1.0) && (secondTransform.c == 1.0 || secondTransform.c == -1.0) {
        isSecondVideoPortrait = true
    }
    if (isFirstVideoPortrait && !isSecondVideoPortrait) || (!isFirstVideoPortrait && isSecondVideoPortrait) {
        let alertController = UIAlertController.init(title: "Error!", message: "cannot combine a video shot in portrait mode with a video shot in landscape mode", preferredStyle: UIAlertControllerStyle.Alert)
        alertController.addAction(UIAlertAction.init(title: "dismiss", style: UIAlertActionStyle.Cancel, handler: { (action) in

        }))
        self.presentViewController(alertController, animated: true){}
    }

    //应用指令
    let firstVideoCompositionInstruction = AVMutableVideoCompositionInstruction()
    firstVideoCompositionInstruction.timeRange = CMTimeRangeMake(kCMTimeZero, firstVideoAssetTrack.timeRange.duration)
    let secondVideoCompositionInstruction = AVMutableVideoCompositionInstruction()
    secondVideoCompositionInstruction.timeRange = CMTimeRangeMake(firstVideoAssetTrack.timeRange.duration, CMTimeAdd(firstVideoAssetTrack.timeRange.duration, secondVideoAssetTrack.timeRange.duration))

    let firstVideoCompositionLayerInstruction = AVMutableVideoCompositionLayerInstruction(assetTrack:videoCompositionTrack)
    firstVideoCompositionLayerInstruction.setTransform(firstTransform, atTime: kCMTimeZero)

    let secondVideoCompositionLayerInstruction = AVMutableVideoCompositionLayerInstruction(assetTrack: videoCompositionTrack)
    secondVideoCompositionLayerInstruction.setTransform(secondTransform, atTime: firstVideoAssetTrack.timeRange.duration)

    firstVideoCompositionInstruction.layerInstructions = [firstVideoCompositionLayerInstruction]
    secondVideoCompositionInstruction.layerInstructions = [secondVideoCompositionLayerInstruction]

    let mutableVideoComposition = AVMutableVideoComposition()
    mutableVideoComposition.instructions = [firstVideoCompositionInstruction,secondVideoCompositionInstruction]

    //
    var naturalSizeFirst:CGSize!
    var naturalSizeSecond:CGSize!
    if isFirstVideoPortrait {
        naturalSizeFirst = CGSizeMake(firstVideoAssetTrack.naturalSize.height, firstVideoAssetTrack.naturalSize.width)
        naturalSizeSecond = CGSizeMake(secondVideoAssetTrack.naturalSize.height, secondVideoAssetTrack.naturalSize.width)
    }else{
        naturalSizeFirst = firstVideoAssetTrack.naturalSize
        naturalSizeSecond = secondVideoAssetTrack.naturalSize
    }
    var renderWidth:CGFloat!
    var renderHeight:CGFloat!
    if naturalSizeFirst.width > naturalSizeSecond.width {
        renderWidth = naturalSizeFirst.width
    }else{
        renderWidth = naturalSizeSecond.width
    }
    if naturalSizeFirst.height > naturalSizeSecond.height {
        renderHeight = naturalSizeFirst.height
    }else{
        renderHeight = naturalSizeSecond.height
    }
    mutableVideoComposition.renderSize = CGSizeMake(renderWidth, renderHeight)
    mutableVideoComposition.frameDuration = CMTimeMake(1,30)

    if kDateFormatter==nil {
        kDateFormatter = NSDateFormatter()
        kDateFormatter?.dateStyle = NSDateFormatterStyle.MediumStyle
        kDateFormatter?.timeStyle = NSDateFormatterStyle.ShortStyle
    }

    let exporter = AVAssetExportSession.init(asset: mutableComposition, presetName: AVAssetExportPresetHighestQuality)
    var outputURL:NSURL?
    let fileManager = NSFileManager.defaultManager()
    do{
        try outputURL = fileManager.URLForDirectory(.DocumentDirectory, inDomain: .UserDomainMask, appropriateForURL: nil, create: true)
        outputURL?.URLByAppendingPathComponent((kDateFormatter?.stringFromDate(NSDate()))!).URLByAppendingPathExtension(String(UTTypeCopyPreferredTagWithClass(AVFileTypeQuickTimeMovie as CFStringRef,kUTTagClassFilenameExtension)))

    }catch{

    }

    exporter?.outputURL = outputURL
    exporter?.outputFileType = AVFileTypeQuickTimeMovie
    exporter?.shouldOptimizeForNetworkUse = true
    exporter?.videoComposition = mutableVideoComposition
    exporter?.exportAsynchronouslyWithCompletionHandler({ 
        dispatch_async(dispatch_get_main_queue(), { 
            if exporter?.status == AVAssetExportSessionStatus.Completed {
                let library = ALAssetsLibrary()
                if library.videoAtPathIsCompatibleWithSavedPhotosAlbum(outputURL) {
                    library.writeVideoAtPathToSavedPhotosAlbum(outputURL,
                        completionBlock:nil)
                }
            }
        })
    })
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


/*
// MARK: - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    // Get the new view controller using segue.destinationViewController.
    // Pass the selected object to the new view controller.
}
*/
}

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