In multithreading mode(core-mt), there are still some issues present

**Describe the bug**
Thank you very much for the updates in version 0.12.8, which have resolved many issues!
I tried running it in 'react-vite-app' and it worked fine with the original sample files.
However, when I adapted it to replace the sample with my own AVI video(bigger size), it didn't complete the task when using the core-mt multithreading mode.
There were no issues when I didn't use the multithreading mode.

my sample file:
[stock-footage.avi.zip](https://github.com/ffmpegwasm/ffmpeg.wasm/files/13702711/stock-footage.avi.zip)

**Screenshots**
Change example code:

When using core-mt(work fail):

When using core(work success):

**Desktop (please complete the following information):**
- OS: macOS Monterey 12.3
- Browser: Chrome 119.0.6045.159 (arm64)
- Version: 0.12.8