iOS视频压缩存储至本地并上传至服务器-b
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
posted on 2016-09-03 23:24 🌞Bob 阅读(1621) 评论(0) 编辑 收藏 举报