Could not save .mp4 video file to iphone camera roll? - iphone

Question

I received the video file contents in the format of NSData and I am playing that file in MPMoviePlayerController successfully with following code
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *FileExtension=[[NSString alloc]init];
if([contentType hasPrefix:#"video"] || [contentType isEqualToString:#"application/video"]) {
FileExtension=#"mov";
//FileExtension=#"mp4";
}
else
{
FileExtension=[contentType lastPathComponent];
}
//appFile is type of NSString.
appFile = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:#"MyFile.%#",FileExtension]];
//videoData is type of NSData
[videoData writeToFile:appFile atomically:YES];
NSURL *fileURL = [NSURL fileURLWithPath:appFile isDirectory:NO];
moviePlayerController = [[MPMoviePlayerController alloc] initWithContentURL:fileURL];
moviePlayerController.view.frame = self.view.bounds;
moviePlayerController.movieSourceType = MPMovieSourceTypeFile;
moviePlayerController.fullscreen = YES;
moviePlayerController.shouldAutoplay=NO;
[self.view addSubview:moviePlayerController.view];
[moviePlayerController prepareToPlay];
but I am unable to write/save this video file to camera roll,this is my code for writing code to the camera roll.
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
NSURL *filePathURL = [NSURL fileURLWithPath:appFile isDirectory:NO];
if ([library videoAtPathIsCompatibleWithSavedPhotosAlbum:filePathURL]) {
[library writeVideoAtPathToSavedPhotosAlbum:filePathURL completionBlock:^(NSURL *assetURL, NSError *error){
if (error) {
NSLog(#"Not success");
} else {
NSLog(#"success");
}
}];
}
this code is work fine when I set mimeType/file_format as .mov & .3Gp but I have problem related to save video to the camera roll when mimeType/file_format as .mp4 file.

Answer 1

You can convert your .mp4 to .mov if you change your appFile this way:
Your code:
appFile = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:#"MyFile.%#",FileExtension]];
New code:
appFile = [documentsDirectory stringByAppendingPathComponent:#"MyFile.mov"];
The SO automatically converts .mp4 to .mov