Filename with comma breaks

Running the command line specifying an output file containing a comma, produces a strange behavior:

```
dvbtee -C2 -I2 "-ofile://filename with, comma.ts"
```

Outputs a broken file of 0 bytes named `filename with`. I searched around and could not find a `, comma.ts` file on the filesystem anywhere. Not sure if the comma is a special control character or if this is a bug.