Function renice

renice(child: ChildProcess, priority: number): void
Renice (change priority) of a running ffmpeg child process. On Linux/macOS: uses the renice command. Range: -20 (highest) to 19 (lowest). On Windows: uses wmic process to set priority class. Requires appropriate OS permissions for negative values on Unix.
Parameters
- child: ChildProcess
- priority: number
Returns void
Example
```
const proc = ffmpeg('input.mp4').output('out.mp4').spawn();
renice(proc.child, 10); // lower priority
```
- Defined in src/helpers/process.ts:16