MP4 issues in Photoshop v27.6. When I open a video file in PS it just shows up blank. I'm able to open and play the video through apps like Quicktime and VLC.

I’m glad I tried to open my mp4 with Ps Beta 27.8 (it seemed fine when it opened), because Ps 27.6 suggested that I trash my “possibly-malware-ridden” file, which didn’t open.

On a whim, I tried to open another mp4 in Ps 2026. It opened, no problem.

Both files are H.264/MPEG-4 AAC.

mp4 is not a video format in itself but is a container for video and audio. To read the file format within it you need a matching codec.The best bet as advised by Ken below is to open it with a convertor utility such as Handbrake, check what format has been used for the video, and convert it to H.264. 

Dave

Hi ​@Giddy_Essence2115\ 

Sorry to hear about this experience, and thanks for sharing all the troubleshooting steps you've already tried. To help narrow this down, could you share a few more details?

• Does this happen with every video file, or only certain ones?
• If you create a brand-new Photoshop document and import a video (Layer → Video Layers → New Video Layer from File), does the same thing happen?
• What operating system and version are you using?
• Did this begin immediately after updating Photoshop to v27.6, or after any OS/GPU driver update?

• Can you please copy and paste the System Info from the Photoshop Help menu?

•  

  Also, under: Photoshop → Settings/ Edit > Prefernces → Performance

  Is “Use Graphics Processor” enabled?

• If you temporarily disable “Use Graphics Processor” and restart Photoshop, does video playback work?
• Do you see any error messages at all when opening the video, or does it simply stay on the white/gray checkerboard background?
• Finally, if possible, could you test with a very small/simple MP4 file (H.264 encoded) and let us know whether that works differently?

These details should help determine whether the issue is related to video decoding or a GPU acceleration issue in Photoshop 27.6.