Issues with multi-file processing solved

Multi-file processing, a distinctive feature of FFmpeg Batch AV Converter, has experienced random issues in fast computers, causing crashes, missing output files.
After some digging, long timed searched cause has been found, so now multi-file processing should work reliably on any computer.

In case you use this feature, you can replace your current executable with this updated version:
https://drive.upm.es/index.php/s/8RcbVoVXwa2YMz6/download

Cheers
Abel