I have just downloaded your video downloader. I am finding it wont work on the site using the Stream Downloader.
When I use the DVR say on a 60 minute video it will download for 3-4 minutes then cut out and start again, then again and again
so I end up with a whole list of 1-2 minute parts of the 60minute video. When it stops and starts another part download I sometimes get an audible sound.
Adjust your split on silence levels or switch off completely. Settings > DVR