Using the Compressor App to make and save thumbnails.

Hi,

I have a lot of .mpg4/.h264 videos that I want to change the thumbnail/Poster frames. I have come across two ways of changing the thumbnails but neither of them actually save it. I want to change the thumbnails and have them appear with the new thumbnail on my IPad. I cannot figure this out for the life of me. Below is what I have tried:

1) Using the Photos app...

• Open the video in Photos
• Select Edit
• Move in timeline to the desired frame
• Select Image -> Make Poster Frame
• Select Done

Everything looks great within Photos, but when I transfer them to my Ipad I lose all the thumbnails.....I've tried exporting them from Photos into a new folder and I still lose the thumbnails. I have tried transferring them both using AirDrop and with the Finder Window (via USB-C cable). They always go back to the default first frame.

2) Using Quicktime...

• Open the video in Quicktime
• Move in timeline to the desired frame
• Press Command + C (Copy)
• Close Quicktime
• Press Command + I (Info) on the video you want to change the Poster frame.
• In the upper left corner select the Q icon and press Command + V (Paste)
• Close the Info window.

I am wondering if using Compressor there might be a way to permanantly change the Poster frame? I want it to show the correct frame no matter which device or app that I use.

I also don't want to change any of the settings (frame rate/Compression/ File type). I basically want to change the thumbnail / Poser Frame and not alter the video whatsoever....

Any thoughts would be helpful!! Thanks in advance!!