First,what you have to do is throw the oject on the floor.

Then save and quit to main menu.

Then go back into the same world and there should be the item on the floor in front of you.

Then pick the items up and go into your inventory [not saving it]

And red cross the minecraft tab

Go back to minecraft log in and go on the same world.

When you spawn,you will have double the amount of objects.

Keep trying because sometimes it doesnt work.

Also can you comment to tell me how to upload vids on blogs?