iOS-视频格式转换(MOV->MP4)

AVURLAsset *avAsset = [AVURLAsset URLAssetWithURL:[NSURL fileURLWithPath:path] options:nil];
NSArray *compatiblePresets = [AVAssetExportSession exportPresetsCompatibleWithAsset:avAsset];

if ([compatiblePresets containsObject:AVAssetExportPresetLowQuality])

{

AVAssetExportSession *exportSession = [[AVAssetExportSession alloc]initWithAsset:avAsset presetName:AVAssetExportPresetPassthrough];
NSString *exportPath = [NSString stringWithFormat:@"%@/%@.mp4",
[NSHomeDirectory() stringByAppendingString:@"/tmp"],
@"1"];
exportSession.outputURL = [NSURL fileURLWithPath:exportPath];
NSLog(@"%@", exportPath);
exportSession.outputFileType = AVFileTypeMPEG4;
[exportSession exportAsynchronouslyWithCompletionHandler:^{

switch ([exportSession status]) {
case AVAssetExportSessionStatusFailed:
NSLog(@"Export failed: %@", [[exportSession error] localizedDescription]);
break;
case AVAssetExportSessionStatusCancelled:
NSLog(@"Export canceled");
break;
case AVAssetExportSessionStatusCompleted:
NSLog(@"转换成功");
break;
default:
break;
}
}];
}