最新做的一個功能涉及到了視頻的錄制、壓縮及上傳。根據網上諸多大神的經驗，終于算是調通了，但也發現了一些問題，所以把我的經驗分享一下。
首先，肯定是調用一下系統的相機或相冊
代碼很基本：
//選擇本地視頻 - (void)choosevideo { UIImagePickerController *ipc = [[UIImagePickerController alloc] init]; ipc.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;//sourcetype有三種分別是camera，photoLibrary和photoAlbum NSArray *availableMedia = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypeCamera];//Camera所支持的Media格式都有哪些,共有兩個分別是@"public.image",@"public.movie" ipc.mediaTypes = [NSArray arrayWithObject:availableMedia[1]];//設置媒體類型為public.movie [self presentViewController:ipc animated:YES completion:nil]; ipc.delegate = self;//設置委托 } //錄制視頻 - (void)startvideo { UIImagePickerController *ipc = [[UIImagePickerController alloc] init]; ipc.sourceType = UIImagePickerControllerSourceTypeCamera;//sourcetype有三種分別是camera，photoLibrary和photoAlbum NSArray *availableMedia = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypeCamera];//Camera所支持的Media格式都有哪些,共有兩個分別是@"public.image",@"public.movie" ipc.mediaTypes = [NSArray arrayWithObject:availableMedia[1]];//設置媒體類型為public.movie [self presentViewController:ipc animated:YES completion:nil]; ipc.videoMaximumDuration = 30.0f;//30秒 ipc.delegate = self;//設置委托 } iOS錄制的視頻格式是mov的，在Android和Pc上都不太好支持，所以要轉換為MP4格式的，而且壓縮一下，畢竟我們上傳的都是小視頻，不用特別清楚
為了反饋的清楚，先放兩個小代碼來獲取視頻的時長和大小，也是在網上找的，稍微改了一下。
- (CGFloat) getFileSize:(NSString *)path { NSLog(@"%@",path); NSFileManager *fileManager = [NSFileManager defaultManager]; float filesize = -1.0; if ([fileManager fileExistsAtPath:path]) { NSDictionary *fileDic = [fileManager attributesOfItemAtPath:path error:nil];//獲取文件的屬性 unsigned long long size = [[fileDic objectForKey:NSFileSize] longLongValue]; filesize = 1.0*size/1024; }else{ NSLog(@"找不到文件"); } return filesize; }//此方法可以獲取文件的大小，返回的是單位是KB。 - (CGFloat) getVideoLength:(NSURL *)URL { AVURLAsset *avUrl = [AVURLAsset assetWithURL:URL]; CMTime time = [avUrl duration]; int second = ceil(time.value/time.timescale); return second; }//此方法可以獲取視頻文件的時長。接收并壓縮
//完成視頻錄制，并壓縮后顯示大小、時長 - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { NSURL *sourceURL = [info objectForKey:UIImagePickerControllerMediaURL]; NSLog(@"%@",[NSString stringWithFormat:@"%f s", [self getVideoLength:sourceURL]]); NSLog(@"%@", [NSString stringWithFormat:@"%.2f kb", [self getFileSize:[sourceURL path]]]); NSURL *newVideoUrl ; //一般.mp4 NSDateFormatter *formater = [[NSDateFormatter alloc] init];//用時間給文件全名，以免重復，在測試的時候其實可以判斷文件是否存在若存在，則刪除，重新生成文件即可 [formater setDateFormat:@"yyyy-MM-dd-HH:mm:ss"]; newVideoUrl = [NSURL fileURLWithPath:[NSHomeDirectory() stringByAppendingFormat:@"/Documents/output-%@.mp4", [formater stringFromDate:[NSDate date]]]] ;//這個是保存在app自己的沙盒路徑里，后面可以選擇是否在上傳后刪除掉。我建議刪除掉，免得占空間。 [picker dismissViewControllerAnimated:YES completion:nil]; [self convertVideoQuailtyWithInputURL:sourceURL outputURL:newVideoUrl completeHandler:nil]; } - (void) convertVideoQuailtyWithInputURL:(NSURL*)inputURL outputURL:(NSURL*)outputURL completeHandler:(void (^)(AVAssetExportSession*))handler { AVURLAsset *avAsset = [AVURLAsset URLAssetWithURL:inputURL options:nil]; AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:avAsset presetName:AVAssetExportPresetMediumQuality]; // NSLog(resultPath); exportSession.outputURL = outputURL; exportSession.outputFileType = AVFileTypeMPEG4; exportSession.shouldOptimizeForNetworkUse= YES; [exportSession exportAsynchronouslyWithCompletionHandler:^(void) { switch (exportSession.status) { case AVAssetExportSessionStatusCancelled: NSLog(@"AVAssetExportSessionStatusCancelled"); break; case AVAssetExportSessionStatusUnknown: NSLog(@"AVAssetExportSessionStatusUnknown"); break; case AVAssetExportSessionStatusWaiting: NSLog(@"AVAssetExportSessionStatusWaiting"); break; case AVAssetExportSessionStatusExporting: NSLog(@"AVAssetExportSessionStatusExporting"); break; case AVAssetExportSessionStatusCompleted: NSLog(@"AVAssetExportSessionStatusCompleted"); NSLog(@"%@",[NSString stringWithFormat:@"%f s", [self getVideoLength:outputURL]]); NSLog(@"%@", [NSString stringWithFormat:@"%.2f kb", [self getFileSize:[outputURL path]]]); //UISaveVideoAtPathToSavedPhotosAlbum([outputURL path], self, nil, NULL);//這個是保存到手機相冊 [self alertUploadVideo:outputURL]; break; case AVAssetExportSessionStatusFailed: NSLog(@"AVAssetExportSessionStatusFailed"); break; } }]; } 我這里用了一個提醒，因為我的服務器比較弱，不能傳太大的文件
-(void)alertUploadVideo:(NSURL*)URL{ CGFloat size = [self getFileSize:[URL path]]; NSString *message; NSString *sizeString; CGFloat sizemb= size/1024; if(size<=1024){ sizeString = [NSString stringWithFormat:@"%.2fKB",size]; }else{ sizeString = [NSString stringWithFormat:@"%.2fMB",sizemb]; } if(sizemb<2){ [self uploadVideo:URL]; } else if(sizemb<=5){ message = [NSString stringWithFormat:@"視頻%@，大于2MB會有點慢，確定上傳嗎？", sizeString]; UIAlertController * alertController = [UIAlertController alertControllerWithTitle: nil message: message preferredStyle:UIAlertControllerStyleAlert]; [alertController addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) { [[NSNotificationCenter defaultCenter] postNotificationName:@"refreshwebpages" object:nil userInfo:nil]; [[NSFileManager defaultManager] removeItemAtPath:[URL path] error:nil];//取消之后就刪除，以免占用手機硬盤空間（沙盒） }]]; [alertController addAction:[UIAlertAction actionWithTitle:@"確定" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) { [self uploadVideo:URL]; }]]; [self presentViewController:alertController animated:YES completion:nil]; }else if(sizemb>5){ message = [NSString stringWithFormat:@"視頻%@，超過5MB，不能上傳，抱歉。", sizeString]; UIAlertController * alertController = [UIAlertController alertControllerWithTitle: nil message: message preferredStyle:UIAlertControllerStyleAlert]; [alertController addAction:[UIAlertAction actionWithTitle:@"確定" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) { [[NSNotificationCenter defaultCenter] postNotificationName:@"refreshwebpages" object:nil userInfo:nil]; [[NSFileManager defaultManager] removeItemAtPath:[URL path] error:nil];//取消之后就刪除，以免占用手機硬盤空間 }]]; [self presentViewController:alertController animated:YES completion:nil]; } } 最后上上傳的代碼，這個是根據服務器來的，而且還是用的MKNetworking，據說已經過時了，放上來大家參考一下吧，AFNet也差不多，就是把NSData傳上去。
-(void)uploadVideo:(NSURL*)URL{ //[MyTools showTipsWithNoDisappear:nil message:@"正在上傳..."]; NSData *data = [NSData dataWithContentsOfURL:URL]; MKNetworkEngine *engine = [[MKNetworkEngine alloc] initWithHostName:@"www.ylhuakai.com" customHeaderFields:nil]; NSMutableDictionary *dic = [[NSMutableDictionary alloc] init]; NSString *updateURL; updateURL = @"/alflower/Data/sendupdate"; [dic setValue:[NSString stringWithFormat:@"%@",User_id] forKey:@"openid"]; [dic setValue:[NSString stringWithFormat:@"%@",[self.web objectForKey:@"web_id"]] forKey:@"web_id"]; [dic setValue:[NSString stringWithFormat:@"%i",insertnumber] forKey:@"number"]; [dic setValue:[NSString stringWithFormat:@"%i",insertType] forKey:@"type"]; MKNetworkOperation *op = [engine operationWithPath:updateURL params:dic httpMethod:@"POST"]; [op addData:data forKey:@"video" mimeType:@"video/mpeg" fileName:@"aa.mp4"]; [op addCompletionHandler:^(MKNetworkOperation *operation) { NSLog(@"[operation responseData]-->>%@", [operation responseString]); NSData *data = [operation responseData]; NSDictionary *resweiboDict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil]; NSString *status = [[resweiboDict objectForKey:@"status"]stringValue]; NSLog(@"addfriendlist status is %@", status); NSString *info = [resweiboDict objectForKey:@"info"]; NSLog(@"addfriendlist info is %@", info); // [MyTools showTipsWithView:nil message:info]; // [SVProgressHUD showErrorWithStatus:info]; if ([status isEqualToString:@"1"]) { [[NSNotificationCenter defaultCenter] postNotificationName:@"refreshwebpages" object:nil userInfo:nil]; [[NSFileManager defaultManager] removeItemAtPath:[URL path] error:nil];//上傳之后就刪除，以免占用手機硬盤空間; }else { //[SVProgressHUD showErrorWithStatus:dic[@"info"]]; } // [[NSNotificationCenter defaultCenter] postNotificationName:@"StoryData" object:nil userInfo:nil]; }errorHandler:^(MKNetworkOperation *errorOp, NSError* err) { NSLog(@"MKNetwork request error : %@", [err localizedDescription]); }]; [engine enqueueOperation:op]; } 以上所述是小編給大家介紹的iOS視頻錄制（或選擇）壓縮及上傳功能（整理），希望對大家有所幫助，如果大家有任何疑問請給我留言，小編會及時回復大家的。在此也非常感謝大家對武林網網站的支持！
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