- (void)mov2mp4:(NSURL *)movUrl
{AVURLAsset *avAsset = [AVURLAsset URLAssetWithURL:movUrl options:nil];NSArray *compatiblePresets = [AVAssetExportSession exportPresetsCompatibleWithAsset:avAsset];/**AVAssetExportPresetMediumQuality 表示视频的转换质量，*/if ([compatiblePresets containsObject:AVAssetExportPresetMediumQuality]) {AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:avAsset presetName:AVAssetExportPresetMediumQuality];//转换完成保存的文件路径NSString * resultPath = [NSHomeDirectory() stringByAppendingFormat:@"/Documents/output-%@.mp4",@"cvt"];exportSession.outputURL = [NSURL fileURLWithPath:resultPath];//要转换的格式，这里使用 MP4exportSession.outputFileType = AVFileTypeMPEG4;//转换的数据是否对网络使用优化exportSession.shouldOptimizeForNetworkUse = YES;//异步处理开始转换[exportSession exportAsynchronouslyWithCompletionHandler:^(void){//转换状态监控switch (exportSession.status) {case AVAssetExportSessionStatusUnknown:NSLog(@"AVAssetExportSessionStatusUnknown");break;case AVAssetExportSessionStatusWaiting:NSLog(@"AVAssetExportSessionStatusWaiting");break;case AVAssetExportSessionStatusExporting:NSLog(@"AVAssetExportSessionStatusExporting");break;case AVAssetExportSessionStatusFailed:NSLog(@"AVAssetExportSessionStatusFailed");  break;case AVAssetExportSessionStatusCancelled:NSLog(@"AVAssetExportSessionStatusCancelled");break;case AVAssetExportSessionStatusCompleted:{//转换完成NSLog(@"AVAssetExportSessionStatusCompleted");//测试使用，保存在手机相册里面ALAssetsLibrary *assetLibrary = [[ALAssetsLibrary alloc] init];[assetLibrary writeVideoAtPathToSavedPhotosAlbum:exportSession.outputURL completionBlock:^(NSURL *assetURL, NSError *error){if (error) {NSLog(@"%@",error);}}];break;}}}];  }  }

#import <AssetsLibrary/AssetsLibrary.h>
#import <MobileCoreServices/MobileCoreServices.h>
#import <AVFoundation/AVFoundation.h>@interface ViewController ()<UIImagePickerControllerDelegate,UINavigationControllerDelegate>@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];}- (IBAction)startCampVD:(id)sender {UIImagePickerController *pickerCon = [[UIImagePickerController alloc]init];pickerCon.sourceType = UIImagePickerControllerSourceTypeCamera;pickerCon.mediaTypes = @[(NSString *)kUTTypeMovie];//设定相机为视频pickerCon.cameraDevice = UIImagePickerControllerCameraDeviceFront;//设置相机后摄像头pickerCon.videoMaximumDuration = 6;//最长拍摄时间pickerCon.videoQuality = UIImagePickerControllerQualityType640x480;//拍摄质量pickerCon.allowsEditing = NO;//是否可编辑pickerCon.delegate = self;[self presentViewController:pickerCon animated:YES completion:nil];}- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {NSLog(@"视频录制完成...");NSLog(@"%@",info);[self mov2mp4:[info objectForKey:UIImagePickerControllerMediaURL]];[self dismissViewControllerAnimated:YES completion:nil];}- (void)mov2mp4:(NSURL *)movUrl
{AVURLAsset *avAsset = [AVURLAsset URLAssetWithURL:movUrl options:nil];NSArray *compatiblePresets = [AVAssetExportSession exportPresetsCompatibleWithAsset:avAsset];/**AVAssetExportPresetMediumQuality 表示视频的转换质量，*/if ([compatiblePresets containsObject:AVAssetExportPresetMediumQuality]) {AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:avAsset presetName:AVAssetExportPresetMediumQuality];//转换完成保存的文件路径NSString * resultPath = [NSHomeDirectory() stringByAppendingFormat:@"/Documents/output-%@.mp4",@"cvt"];exportSession.outputURL = [NSURL fileURLWithPath:resultPath];//要转换的格式，这里使用 MP4exportSession.outputFileType = AVFileTypeMPEG4;//转换的数据是否对网络使用优化exportSession.shouldOptimizeForNetworkUse = YES;//异步处理开始转换[exportSession exportAsynchronouslyWithCompletionHandler:^(void){//转换状态监控switch (exportSession.status) {case AVAssetExportSessionStatusUnknown:NSLog(@"AVAssetExportSessionStatusUnknown");break;case AVAssetExportSessionStatusWaiting:NSLog(@"AVAssetExportSessionStatusWaiting");break;case AVAssetExportSessionStatusExporting:NSLog(@"AVAssetExportSessionStatusExporting");break;case AVAssetExportSessionStatusFailed:NSLog(@"AVAssetExportSessionStatusFailed");  break;case AVAssetExportSessionStatusCancelled:NSLog(@"AVAssetExportSessionStatusCancelled");break;case AVAssetExportSessionStatusCompleted:{//转换完成NSLog(@"AVAssetExportSessionStatusCompleted");//测试使用，保存在手机相册里面ALAssetsLibrary *assetLibrary = [[ALAssetsLibrary alloc] init];[assetLibrary writeVideoAtPathToSavedPhotosAlbum:exportSession.outputURL completionBlock:^(NSURL *assetURL, NSError *error){if (error) {NSLog(@"%@",error);}}];break;}}}];  }  }- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {[picker dismissViewControllerAnimated:YES completion:^{}];NSLog(@"视频录制取消了...");}