AVAssetExportSession剪切视频转换问题
创始人
2024-11-12 20:00:33
0

使用AVMutableComposition、AVMutableVideoComposition和AVMutableAudioMix创建新的AVAsset,并将其导出为视频文件。下面是示例代码:

AVURLAsset *originalAsset = [[AVURLAsset alloc] initWithURL:originalURL options:nil];
AVMutableComposition *composition = [AVMutableComposition composition];

AVAssetTrack *videoTrack = [[originalAsset tracksWithMediaType:AVMediaTypeVideo] firstObject];
AVMutableCompositionTrack *compositionVideoTrack = [composition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];

[compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, originalAsset.duration)
                            ofTrack:videoTrack
                             atTime:kCMTimeZero
                              error:nil];

AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:composition presetName:AVAssetExportPresetMediumQuality];

AVMutableVideoComposition *videoComposition = [AVMutableVideoComposition videoComposition];
videoComposition.renderSize = CGSizeMake(640, 640);
videoComposition.frameDuration = CMTimeMake(1, 30);

AVMutableVideoCompositionInstruction *instruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction];
instruction.timeRange = CMTimeRangeMake(kCMTimeZero, composition.duration);

AVMutableVideoCompositionLayerInstruction *layerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:compositionVideoTrack];
[layerInstruction setTransform:CGAffineTransformMakeTranslation(64, 64) atTime:kCMTimeZero];

instruction.layerInstructions = @[layerInstruction];
videoComposition.instructions = @[instruction];
exportSession.videoComposition = videoComposition;
exportSession.outputFileType = AVFileTypeMPEG4;
exportSession.outputURL = outputFileURL;
[exportSession exportAsynchronouslyWithCompletionHandler:^{
    // Handle export completion or errors
}];

该代码将从原始视频文件中提取视频轨道,并使用AVMutableComposition创建新的AVAsset。AVMutableVideoComposition和AVMutableAudioMix对象用于对导出视频进行剪切和转换。最终,AVAssetExportSession用于将新的AVAsset导出为MPEG-4文件。

相关内容

热门资讯

透视能赢!aapoker辅助怎... 透视能赢!aapoker辅助怎么用(透视)真的假的(其实是有挂);1、aapoker辅助怎么用ai辅...
透视ai代打!德普软件(透视)... 透视ai代打!德普软件(透视)app安卓版破解版(一直真的是有挂)1、下载好德普软件辅助软件之后点击...
透视讲解!aapoker怎么设... 透视讲解!aapoker怎么设置提高好牌几率(透视)脚本(好像真的是有挂);1、进入到aapoker...
透视线上!德普之星透视辅助软件... 透视线上!德普之星透视辅助软件下载(透视)免费透视(本来是有挂)1、德普之星透视辅助软件下载ai辅助...
透视美元局!aapoker公共... 透视美元局!aapoker公共底牌(透视)透视脚本下载(本来存在有挂);aapoker公共底牌辅助器...
透视ai!德普之星私人局透视(... 透视ai!德普之星私人局透视(透视)辅助器app(其实真的有挂)1、在德普之星私人局透视ai机器人技...
透视计算!aapoker公共底... 透视计算!aapoker公共底牌(透视)辅助插件工具(果然是真的有挂)1、aapoker公共底牌ai...
透视攻略!德普之星透视辅助软件... 透视攻略!德普之星透视辅助软件是真的吗(透视)透视(总是是有挂)1、用户打开应用后不用登录就可以直接...
透视脚本!aapoker透视怎... 透视脚本!aapoker透视怎么用(透视)透视脚本入口(总是是有挂)所有人都在同一条线上,像星星一样...
透视了解!德扑圈透视(透视)私... 透视了解!德扑圈透视(透视)私人局透视(确实真的是有挂);1、点击下载安装,德扑圈透视插件透视分类一...