Unable to process RAW .MOV file created from iPhoneX. pthread error thrown

**Describe the bug**
Using this to convert videos, its working so far good except any raw format. I created short 8 seconds vid via iPhoneX which is .mov, yun420p and it went to 22 frames and thrown pthread error. Not sure how to fix it.

**To Reproduce**
Steps to reproduce the behavior:
1. Record any video from iPhoneX with 4K at 30 FPS
2. Open the demo app for test https://ffmpegwasm.netlify.app/#demo (I have created my own using react but demo have same issue)
3. Open the DevTool and you will see the error.

**Expected behavior**
As I tried to convert that format with same command on my windows via cmd its working good, but on web its not.

**Screenshots**

**Desktop (please complete the following information):**
- OS: Windows
- Browser chrome

**Smartphone (please complete the following information):**
- Device: iPhoneX
- OS: iOS14
- Browser Safari & Chrome

**Additional context**
Add any other context about the problem here.