最近做了一个项目,我把其中的核心功能拿出来和大家分享一下,重点还是自己梳理一下。
这里关于视频转码存储我整理了两个方法,这两个方法都是针对相册内视频进行处理的。
1、该方法没有对视频进行压缩,只是将视频原封不动地从相册拿出来放到沙盒路径下,目的是拿到视频的NSData以便上传
这里我传了一个URL,这个URL有点特别,是相册文件URL,所以我说过只针对相册视频进行处理
//将原始视频的URL转化为NSData数据,写入沙盒 + (void)videoWithUrl:(NSString *)url withFileName:(NSString *)fileName { ALAssetsLibrary *assetLibrary = [[ALAssetsLibrary alloc] init]; dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0),^{ if (url) { [assetLibrary assetForURL:[NSURL URLWithString:url] resultBlock:^(ALAsset *asset) { ALAssetRepresentation *rep = [asset defaultRepresentation]; NSString *pathDocuments = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]; NSString *imagePath = [NSString stringWithFormat:@"%@/Image", pathDocuments]; NSString *dbFilePath = [imagePath stringByAppendingPathComponent:fileName]; char const *cvideoPath = [dbFilePath UTF8String]; FILE *file = fopen(cvideoPath, "a+"); if (file) { const int bufferSize = 11024 * 1024; // 初始化一个1M的buffer Byte *buffer = (Byte*)malloc(bufferSize); NSUInteger read = 0, offset = 0, written = 0; NSError* err = nil; if (rep.size != 0) { do { read = [rep getBytes:buffer fromOffset:offset length:bufferSize error:&err]; written = fwrite(buffer, sizeof(char), read, file); offset += read; } while (read != 0 && !err);//没到结尾,没出错,ok继续 } // 释放缓冲区,关闭文件 free(buffer); buffer = NULL; fclose(file); file = NULL; } } failureBlock:nil]; } }); }
2、推荐使用该方法,该方法对视频进行压缩处理,压缩的程度可调
这里我传的是模型过去,将我的URL带过去的,然后压缩完毕用模型把NSData带出来,数据大家根据自己需求自由发挥
+ (void) convertVideoWithModel:(RZProjectFileModel *) model { model.filename = [NSString stringWithFormat:@"%ld.mp4",RandomNum]; //保存至沙盒路径 NSString *pathDocuments = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]; NSString *videoPath = [NSString stringWithFormat:@"%@/Image", pathDocuments]; model.sandBoxFilePath = [videoPath stringByAppendingPathComponent:model.filename]; //转码配置 AVURLAsset *asset = [AVURLAsset URLAssetWithURL:model.assetFilePath options:nil]; AVAssetExportSession *exportSession= [[AVAssetExportSession alloc] initWithAsset:asset presetName:AVAssetExportPresetMediumQuality]; exportSession.shouldOptimizeForNetworkUse = YES; exportSession.outputURL = [NSURL fileURLWithPath:model.sandBoxFilePath]; exportSession.outputFileType = AVFileTypeMPEG4; [exportSession exportAsynchronouslyWithCompletionHandler:^{ int exportStatus = exportSession.status; RZLog(@"%d",exportStatus); switch (exportStatus) { case AVAssetExportSessionStatusFailed: { // log error to text view NSError *exportError = exportSession.error; NSLog (@"AVAssetExportSessionStatusFailed: %@", exportError); break; } case AVAssetExportSessionStatusCompleted: { RZLog(@"视频转码成功"); NSData *data = [NSData dataWithContentsOfFile:model.sandBoxFilePath]; model.fileData = data; } } }]; }
在这里你可以修改压缩比例,苹果官方都封装好了,根据需求调整
AVAssetExportSession *exportSession= [[AVAssetExportSession alloc] initWithAsset:asset presetName:AVAssetExportPresetMediumQuality];
在这里修改输出类型,正常情况下选MP4不会有什么问题的
exportSession.outputFileType = AVFileTypeMPEG4;
Mark一下图片压缩用这个,image是图片,0.4是比例,大小可调
model.fileData = UIImageJPEGRepresentation(image, 0.4);
这样你就很愉快地拿到转码过后的NSData了,然后播放一下试试
MPMoviePlayerViewController* playerView = [[MPMoviePlayerViewController alloc] initWithContentURL:[NSURL fileURLWithPath:sandBoxFilePath]]; [superVC presentViewController:playerView animated:YES completion:nil];
备注一下
可以发现我这里使用了沙盒存储,在下一节我整理一下用代码管理应用沙盒。
更新
最近发现好多人联系我,问我要Demo,最近我也整理了一下,目前挂在github上,望大神们指正。https://github.com/Snoopy008/SelectVideoAndConvert
文/Snoopy008(简书作者)
原文链接:http://www.jianshu.com/p/1eeaec2ae0fa
转自:http://blog.5ibc.net/p/89566.html
时间: 2024-10-08 11:55:57