How to transfer ripped movies on ATV1 external hard drive to ITunes?

I have 1st gen with external hard drive. My hard drive on computer crashed and I lost the movies in ITunes that I had ripped and synced with the ATV1 external harddrive.

I want to transfer the movies on ATV1 exteranl hardive to Itunes on my Mac. But I am concerned that it may erase movies in ATV1 since there is nothing in itunes.

Please help with how to get the ripped movies back to iTunes on Mac?