iOS视频转码 mov 转 mp4

利用AVFoundation框架实现视频格式转码，下面以mov转mp4为例：<pre>/**mov转mp4格式*/-(void)convertMovSourceURL:(NSURL *)sourceUrl{AVURLAsset *avAsset = [AVURLAsset URLAssetWithURL:sourceUrl options:nil];NSArray *compatiblePresets=[AVAssetExportSession exportPresetsCompatibleWithAsset:avAsset];//NSLog(@"%@",compatiblePresets);if ([compatiblePresets containsObject:AVAssetExportPresetHighestQuality]) {AVAssetExportSession *exportSession=[[AVAssetExportSession alloc] initWithAsset:avAsset presetName:AVAssetExportPresetHighestQuality];NSDateFormatter *formater=[[NSDateFormatter alloc] init];//用时间给文件全名[formater setDateFormat:@"yyyyMMddHHmmss"];NSString *mp4Path=[[NSUserDefaults standardUserDefaults] objectForKey:@"kMP4FilePath"];NSString *resultPath=[NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES)[0] stringByAppendingFormat:@"/output-%@.mp4", [formater stringFromDate:[NSDate date]]];
    exportSession.outputURL=[NSURL fileURLWithPath:resultPath];    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(@"resultPath = %@",resultPath);                 UIAlertController \*alert=[UIAlertController alertControllerWithTitle:@"提示" message:@"转换完成" preferredStyle:UIAlertControllerStyleAlert];                 UIAlertAction \*confirm=[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:nil];                 [alert addAction:confirm];                 [[UIApplication sharedApplication].keyWindow.rootViewController presentViewController:alert animated:YES completion:nil];                 BOOL success=[[NSFileManager defaultManager]moveItemAtPath:resultPath toPath:[mp4Path stringByAppendingPathComponent:@"1.mp4"] error:nil];                 if(success)                 {                     NSArray \*files=[[NSFileManager defaultManager] contentsOfDirectoryAtPath:mp4Path error:nil];                     NSLog(@"%@",files);                     NSLog(@"success");                 }                                  break;             }             case AVAssetExportSessionStatusFailed:                 NSLog(@"AVAssetExportSessionStatusFailed");                 break;         }     }];}
}</pre>
用法如下：
<pre>
@interface ViewController ()<UIImagePickerControllerDelegate,UINavigationControllerDelegate>
@end
@implementation ViewController
(void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor=[UIColor whiteColor];
self.navigationController.navigationBar.barStyle=UIBarStyleBlack;
self.title=@"视屏格式转换";
UIButton *btn=[[UIButton alloc]initWithFrame:CGRectMake(0, 0, 100, 50)];
[btn setTitle:@"转换" forState:UIControlStateNormal];
btn.backgroundColor=[UIColor orangeColor];
[self.view addSubview:btn];
[btn addTarget:self action:@selector(convert:) forControlEvents:UIControlEventTouchUpInside];
btn.center=self.view.center;
}
pragma mark - UIImagePicker
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
NSURL *videoURL=[info objectForKey:@"UIImagePickerControllerMediaURL"];
//[ProgressHUD show:@"转换中..."];
[self convertMovSourceURL:videoURL];
[picker dismissViewControllerAnimated:YES completion:nil];
}
-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
[picker dismissViewControllerAnimated:YES completion:nil];
}
</pre>


作者：CGPointZero
链接：http://www.jianshu.com/p/25c218019fa0
來源：简书
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