.mp4 fails to playback

[Orange01]

Having used VLC for quite while, I have recently had an issue where VLC will not play an .mp4 file on my Windows 10 Pro (fully patched and up to date).
I tried several .mp4's and all fail to run in VLC. VLC opens the file and the first frame is display but that's all I get on a 57sec video, although the progress bar at the bottom appears to run ok from beginning to end.
Reset my desktop and un-installed VLC and re-installed but same issue. I downloaded the same file to my laptop (same VLC version) and it plays fine.

I installed 'Potplayer' onto my desktop and the file plays fine.
.mkv files work ok in VLC, so the only issue have is .mp4's?

My setup is a Windows 10 Pro 64bit
INTEL I9 10900K
Asus Maximus XII Formula
Asus Geforce RTX3060 Ti
32GB RAM
1TB M.2 Nvme Firecuda SSD

Thanks for any suggestions/help

AKJ

I did turn debug on and the only errors I get are:-

"1 * main error: buffer deadlock prevented
main debug: Decoder wait done in 313 ms
main warning: picture is too late to be displayed (missing 239 ms)
main warning: picture is too late to be displayed (missing 319 ms)
main warning: picture is too late to be displayed (missing 154 ms)
main warning: picture is too late to be displayed (missing 237 ms)
avcodec warning: More than 11 late frames, dropping frame
avcodec warning: More than 11 late frames, dropping frame
avcodec warning: More than 11 late frames, dropping frame
avcodec warning: More than 11 late frames, dropping frame
avcodec warning: More than 11 late frames, dropping frame
avcodec warning: More than 11 late frames, dropping frame
avcodec warning: More than 11 late frames, dropping frame
main debug: auto hiding mouse cursor
avcodec warning: More than 11 late frames, dropping frame
avcodec warning: More than 11 late frames, dropping frame
avcodec warning: More than 11 late frames, dropping frame
avcodec error: more than 5 seconds of late video -> dropping frame (computer too slow ?)
avcodec error: more than 5 seconds of late video -> dropping frame (computer too slow ?)
avcodec error: more than 5 seconds of late video -> dropping frame (computer too slow ?)
avcodec error: more than 5 seconds of late video -> dropping frame (computer too slow ?)
avcodec error: more than 5 seconds of late video -> dropping frame (computer too slow ?)
avcodec error: more than 5 seconds of late video -> dropping frame (computer too slow ?)
avcodec error: more than 5 seconds of late video -> dropping frame (computer too slow ?)
avcodec error: more than 5 seconds of late video -> dropping frame (computer too slow ?)
avcodec error: more than 5 seconds of late video -> dropping frame (computer too slow ?)
avcodec error: more than 5 seconds of late video -> dropping frame (computer too slow ?)
avcodec error: more than 5 seconds of late video -> dropping frame (computer too slow ?)"

[Lotesdelere]

Some tips:
https://forum.videolan.org/viewtopic.php?f=2&t=156428

[Orange01]

Thanks for the suggestions, this resolved my issue which was down to the number of threads.

'Tools', 'Preferences', select the checkbox 'All' at the bottom next to 'Show Settings', 'Input/Codecs', 'Video Codecs' and 'FFMPeg' under 'Threads' changed it from 0 to 4 (I suspect 0 is use all cores?), 'Save' and restarted VLC and it worked!!

Thanks for your help