ios - downloading video from youtube objective c -

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i'm trying download video youtube getting error.

error mention in code

my code 

-(void)downloadvideo{ lbyoutubeextractor *extractor = [[lbyoutubeextractor alloc] initwithurl:[nsurl urlwithstring:[nsstring stringwithformat:(@"https://www.youtube.com/watch?v=%@"), videoidtodownload ]] quality:lbyoutubevideoqualitylarge]; [extractor extractvideourlwithcompletionblock:^(nsurl *videourl, nserror *error) {     if(!error) {         nslog(@"did extract video url using completion block: %@", videourl);          dispatch_async(dispatch_get_global_queue(dispatch_queue_priority_default, 0), ^{              nserror* error = nil;             nsdata* data1 = [nsdata datawithcontentsofurl:videourl options:nsdatareadinguncached error:&error]; //data1 nill             if (error) { //error domain=nscocoaerrordomain code=256 "the file “3gpp;+codecs="mp4v.20.3,+mp4a.40.2"&fallback_host=tc.v8.cache4.googlevideo.com&itag=36” couldn’t opened."                 nslog(@"error=%@", error);             }else{             nsstring *filename = [nsstring stringwithformat:(@"video_%@.mp4"), videoidtodownload ];             [data1 writetofile:[dirpath stringbyappendingpathcomponent:filename] atomically:yes];             nslog(@"file %@ saved", filename);             }         });     } else {         nslog(@"failed extracting video url using block due error:%@", error);     } }];

}

using lib https://github.com/larcus94/lbyoutubeview

if solution please me.

thanks


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