Unable to use object masking tool

Hi ​@default47yrqnsxcs1x ,

Please let us know some of the details below. That would help us to understand better what you're seeing. 

• Screen Recording: If possible, include a recording of your screen showing the issue.
• Premiere Version: How to find the exact version of Premiere you're using.
• Operating System: Specify Windows or macOS, along with the version.
• GPU Driver (Windows only): Please let us know your video card driver version. We recommend updating to the most recent version; for NVIDIA users, we strongly recommend the Studio version of the driver.
• Video Format: If the issue relates to playback or export, please specify the format (and ideally share a sample video).
  
  If you have time to check out the Help X articles below, they offer some support on how the new Object Masking tool works. 
  Masking in Adobe Premiere: Complete Guide 2026 , Adobe Premiere Object Masking Tutorial | Fast Mask & Track
  
  Let us know if this helps.
  Ian

What’s you’re media? Is it phone media? If so, and then it’s VFR, variable frame rate, you’re going to run into this. Using ShutterEncoder or Handbrake to convert this to CFR, constant frame rate, will fix that.