Playing youtube video using HCYoutubeParser - ios

Question

I am using HCYoutubeParser(https://github.com/hellozimi/HCYoutubeParser) to play some videos in my ios app. When I am trying to play some video, it doesn't seem to play it.
The code looks like this:
- (void)playVideo:(id)sender
{
if (_urlToLoad)
{
MPMoviePlayerViewController *player = [[MPMoviePlayerViewController alloc]initWithContentURL:_urlToLoad];
_mp = player;
[self presentViewController:_mp animated:YES completion:nil];
}
}
- (void)submitYouTubeURL:(id)sender {
[playButton setImage:nil forState:UIControlStateNormal];
NSURL *url = [NSURL URLWithString:_urlOfYoutube];
activityIndicator.hidden = NO;
[HCYoutubeParser thumbnailForYoutubeURL:url thumbnailSize:YouTubeThumbnailDefaultHighQuality completeBlock:^(UIImage *image, NSError *error) {
if (!error) {
[playButton setBackgroundImage:image forState:UIControlStateNormal];
playButton.hidden = NO;
NSDictionary *qualities = [HCYoutubeParser h264videosWithYoutubeURL:url];
_urlToLoad = nil;
_urlToLoad = [NSURL URLWithString:[qualities objectForKey:#"medium"]];
NSLog(#"%#",[NSURL URLWithString:[qualities objectForKey:#"medium"]]);
activityIndicator.hidden = YES;
[playButton setImage:[UIImage imageNamed:#"play_button"] forState:UIControlStateNormal];
}
else {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Error" message:[error localizedDescription] delegate:nil cancelButtonTitle:#"Dismiss" otherButtonTitles:nil];
[alert show];
}
}];
}
The line that gives the problem is _urlToLoad = [NSURL URLWithString:[qualities objectForKey:#"medium"]];
[NSURL URLWithString:[qualities objectForKey:#"medium"]] returns null..
How do I solve this?

Answer 1

In my case , I was getting 0 key value pair for
NSDictionary *qualities = [HCYoutubeParser h264videosWithYoutubeURL:url];
Ie , I was getting qualities having 0 key value pair.
I found that code in HCYoutubeParser.m , in method + (NSDictionary *)h264videosWithYoutubeID:(NSString *)youtubeID a variable signature variable was not getting initialized , so I replaced NSString *signature = nil; with NSString *signature = #"";