How iOS creates a video thumbnail image

How iOS creates a video thumbnail image

//writes the complete picture and the thumbnail image to the Temp folder
     nsdata *pngimage =  uiimagepngrepresentation (thumbnail) ;
 if  ([pngimage writetofile:[nsstring stringwithformat:@ "%@/tempimage.png", Temp_folder] atomically: yes]) {
 

UIImage *mythumbnail = [[UIImage alloc] initwithdata:pngimage];

Uigraphicsbeginimagecontext (Cgsizemake (60.0, 60.0));

[Mythumbnail Drawinrect:cgrectmake (0.0, 0.0, 60.0, 60.0)];

UIImage *newimage = Uigraphicsgetimagefromcurrentimagecontext ();

Uigraphicsendimagecontext ();

Uiimageview *thumbview = [[Uiimageview alloc] Initwithframe:cgrectmake (0.0, 0.0, 60.0, 60.0)];

Thumbview.image = NewImage;

[Self.view Addsubview:thumbview];

NSData *thumbdata = uiimagepngrepresentation (newimage);

if ([Thumbdata writetofile:[nsstring stringWithFormat:@ "%@/tempimagethumb.png"] atomically:YES]) {

NSLog (@ "thumb written!");

}

}

Video images can be captured from the video

_movieplayer = [[MPMoviePlayerController alloc]initwithcontenturl: Movieurl];

UIImage *thumbnail = [_movieplayerthumbnailimageattime:1.0 timeoption: Mpmovietimeoptionnearestkeyframe

How iOS creates a video thumbnail image