iphone sdk > 3.0 . Video Thumbnail?

Question

From what i have read apple doesnt expose the api to allow developers to get a thumbnail of a movie using the current sdk.

Can any one share some code as to how the

Answer 1

Hope my code could help you guys. It's ugly. I think apple should open this kind of APIs. Of course, all NSLog() should be removed. It's just for demonstration.

alvin

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
 // e.g.
 NSString *tempFilePath = [(NSURL *)[info valueForKey:UIImagePickerControllerMediaURL] absoluteString];
 NSLog(@"didFinishPickingMediaWithInfo: %@",tempFilePath);
 // e.g. /private/var/mobile/Applications/D1E784A4-EC1A-402B-81BF-F36D3A08A332/tmp/capture/capturedvideo.MOV
 tempFilePath = [[tempFilePath substringFromIndex:16] retain];
 NSLog(@"didFinishPickingMediaWithInfo: %@",tempFilePath);
 NSLog(@"===Try to save video to camera roll.===");
 NSLog(@"UIVideoAtPathIsCompatibleWithSavedPhotosAlbum: %@",UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(tempFilePath)? @"YES":@"NO");
 // Check if the video file can be saved to camera roll.
    if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(tempFilePath)){
  // YES. Copy it to the camera roll.
  UISaveVideoAtPathToSavedPhotosAlbum(tempFilePath, self, @selector(video:didFinishSavingWithError:contextInfo:), tempFilePath);
 }

 [self dismissModalViewControllerAnimated:YES];
}

- (void)video:(NSString *)videoPath didFinishSavingWithError:(NSError *)error contextInfo:(NSString *)contextInfo{
 NSLog(@"didFinishSavingWithError--videoPath in camera roll:%@",videoPath);
 NSLog(@"didFinishSavingWithError--videoPath in temp directory:%@",contextInfo);
 // The thumbnail jpg should located in this directory.
 NSString *thumbnailDirectory = [[contextInfo stringByDeletingLastPathComponent] stringByDeletingLastPathComponent];

 // Debug info. list all files in the directory of the video file.
 // e.g. /private/var/mobile/Applications/D1E784A4-EC1A-402B-81BF-F36D3A08A332/tmp/capture
 NSLog([contextInfo stringByDeletingLastPathComponent]);
 NSLog([[[NSFileManager defaultManager] contentsOfDirectoryAtPath:[contextInfo stringByDeletingLastPathComponent] error:nil] description]);
 // Debug info. list all files in the parent directory of the video file, i.e. the "~/tmp" directory.
 // e.g. /private/var/mobile/Applications/D1E784A4-EC1A-402B-81BF-F36D3A08A332/tmp
 NSLog(thumbnailDirectory);
 NSLog([[[NSFileManager defaultManager] contentsOfDirectoryAtPath:thumbnailDirectory error:nil] description]);
 ///////////////////

 // Find the thumbnail for the video just recorded.
 NSString *file,*latestFile;
 NSDate *latestDate = [NSDate distantPast];
 NSDirectoryEnumerator *dirEnum = [[NSFileManager defaultManager] enumeratorAtPath:[[contextInfo stringByDeletingLastPathComponent]stringByDeletingLastPathComponent]];
 // Enumerate all files in the ~/tmp directory
 while (file = [dirEnum nextObject]) {
  // Only check files with jpg extension.
  if ([[file pathExtension] isEqualToString: @"jpg"]) {
   NSLog(@"***latestDate:%@",latestDate);
   NSLog(@"***file name:%@",file);
   NSLog(@"***NSFileSize:%@", [[dirEnum fileAttributes] valueForKey:@"NSFileSize"]);
   NSLog(@"***NSFileModificationDate:%@", [[dirEnum fileAttributes] valueForKey:@"NSFileModificationDate"]);
   // Check if current jpg file is the latest one.
   if ([(NSDate *)[[dirEnum fileAttributes] valueForKey:@"NSFileModificationDate"] compare:latestDate] == NSOrderedDescending){
    latestDate = [[dirEnum fileAttributes] valueForKey:@"NSFileModificationDate"];
    latestFile = file;
    NSLog(@"***latestFile changed:%@",latestFile);
   }
  }
 }
 // The thumbnail path.
 latestFile = [NSTemporaryDirectory() stringByAppendingPathComponent:latestFile];
 NSLog(@"****** The thumbnail file should be this one:%@",latestFile);

 // Your code ...
 // Your code ...
 // Your code ...
}