Video playback in Reaper Daw (.mov) file type, not playing as smooth when i play it in VLC in windows

it freezes a bit.....how can i fix this?

 

Preferences -> Media -> Video.

Make sure output is set to DS EVR if it wasn't already. Check if it plays fine now, if it doesn't, in order of increasing difficulty:

- Install these Microsoft extensions from the Windows store: Web Media Extensions, AV1 Video Extension, VP9 Video Extensions, MPEG-2 Video Extension, HEVC Video Extensions (Device). Reset decoder priority to default.

- Install VLC. Make "vlc" the first item in the "Video decoder priority" setting. Click "Show decoder information" to verify that Reaper has picked up your VLC installation, re-install VLC if necessary.

- Install LAVFilters, make "dshow_depr" the first item in decoder priority. Verify with "Show decoder information".

- Install FFMPEG for Reaper, make "ffmpeg" the first item in decoder priority. Verify with "Show decoder information". Download from here: https://github.com/GyanD/codexffmpeg/releases or https://www.gyan.dev/ffmpeg/builds/

 

if you check video file/item properties in Reaper, what playback codec/engine do you see as "using"?
you should set Reaper to use VLC codecs, and/or ffmpeg
https://wiki.cockos.com/wiki/index.php/Video_Support
https://forum.cockos.com/showthread.php?t=82459