Convert MP4 to JPEG

[Fern49]

In Windows 10. I used Prism converter to convert my video to AV1 for playing on the tv, ( a file that it supports) only to find that during the process the photos became blurred. I now want to change a video file from MP4 to JPEG, the video is in Windows Media Player but I cannot 'save' the file to get it into video converter because WMP doesn't have any 'save' box to click on. I tried saving them to  burn, only to find since downloading Windows 10 even my DVD burner now only supports WMA, JPEG, MKV, MP3.

Microsoft