This browser is no longer supported.
Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(256, 0%, 34%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EH%3C/text%3E%3C/svg%3E)
There are multiple posts about thumbnails of HEVC encoded video files not working.
My app generates HEVC encoded video files, so I have complete control of the format. I wonder if there is anything that can be done to have the thumbnails working for HEVC on Windows 10/11.
Do you development UWP app? and Thumbnails for HEVC video files not working for explorer or UWP Thumbnails api?
The UWP app creates MP4 files. The thumbnails of the created MP4 files with HEVC encoding all look green as others have described. We are responsible for the code to generate MP4 files.
First, we would like to know if it is possible at all to have working thumbnails of HEVC MP4 files.
Can this MP4 file be played normally?
Yes, it plays flawlessly.
The problem looks not a develop issue, it more related with OS, I'd suggest you submit a feedback/feature request about this eature in the Feedback Hub. You could find the Feedback Hub in the Start Menu.
Thank you. This is all I need to know - whether one could tweak the code to make thumbnails for HEVC possible. Probably others have already provided the feedback.
Could you turn your comment into an answer for me to accept?
The thumbnails are working fine now.
I wonder if a recent Windows update fixed it.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(176, 24%, 27%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMA%3C/text%3E%3C/svg%3E)
Hi @Hong
For HEVC Codec and thumbnail . Please go to Microsoft store on your machine and search "HEVC Extension" there .
Download and install the Extension .
you might need to purchase the codec last time checked it was paid app for 1$
--If the reply is helpful, please Upvote and Accept it as an answer–
There is no problem in HEVC decoding. The HEVC video works flawlessly. Only the thumbnails are the issue.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(92.8, 23%, 18%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESS%3C/text%3E%3C/svg%3E)
Have you tried reinstalling HEVC codec?
No.
My current assumption is that Windows does not support thumbnails of HEVC encoded MP4 files. I have not seen any evidence showing Windows supports it after an extensive search. Have you seen such evidence?
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(243.2, 36%, 33%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ELA%3C/text%3E%3C/svg%3E)
I´ve been having, I´d say, sort of a related issue. My thumbnails appear to have some sort of color stains on the footage. Premiere has no problem with them, but Davinci Resolve seems to be reading those stains, and I can´t seem to get rid of them. 
The first thing to do is to check what codec is on the system. Thumbnails of mp4, mov containers with hevc streams may not be displayed in the system, but the codec itself may be present. To do this you need to open the media file with a player that does not support codecs itself but plays files using the system codecs - it is either windows media player classic or a similar application. If everything is OK, then it is not the codec, but the system settings.
After checking, I just installed icaros - a program that reconfigures windows explorer to either display thumbnails for certain containers (extensions) or not. No windows store needed in this case.