问题
对视频进行压缩并输出
解决方案
代码语言：javascript复制/// 压缩视频文件
-(void)videoCompressionWithUrl:(NSURL *)url
finish:(void(^)(NSURL * fileUrl))finishCallback
{
NSString *docuPath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];
#ifdef DEBUG
NSData * orgData = [NSData dataWithContentsOfURL:url];
NSLog(@"原视频长度:%d MB",orgData.length/1024/1024);
#endif
NSString *destFilePath = [docuPath stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.MOV",[[[NSUUID UUID]UUIDString]substringToIndex:8]]];
NSURL *destUrl = [NSURL fileURLWithPath:destFilePath];
//将视频文件copy到沙盒目录中
NSFileManager *manager = [NSFileManager defaultManager];
NSError *error = nil;
[manager copyItemAtURL:url toURL:destUrl error:&error];
//加载视频资源
AVAsset *asset = [AVAsset assetWithURL:destUrl];
//创建视频资源导出会话
AVAssetExportSession *session = [[AVAssetExportSession alloc] initWithAsset:asset presetName:AVAssetExportPresetMediumQuality];
//创建导出视频的URL
NSString *resultPath = [docuPath stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.MOV",[[[NSUUID UUID]UUIDString]substringToIndex:8]]];
session.outputURL = [NSURL fileURLWithPath:resultPath];
//必须配置输出属性
session.outputFileType = @"com.apple.quicktime-movie";
//导出视频
[session exportAsynchronouslyWithCompletionHandler:^{
#ifdef DEBUG
NSData * resultData = [NSData dataWithContentsOfURL:[NSURL URLWithString:resultPath]];
NSLog(@"压缩后的视频长度:%d MB",resultData.length/1024/1024);
#endif
NSLog(@"压缩后的视频地址为 %@",resultPath);
if (finishCallback) {
NSURL * resultPathUrl = [NSURL URLWithString:resultPath];
finishCallback(resultPathUrl);
}
//删除沙盒中的高质量视频文件
[manager removeItemAtPath:destFilePath error:nil];
}];
}
