I want to download live streaming video from some websites and it seems Internet Download Manager can handle the job. However, the video I want is just a small part of the live stream and the the stream itself never stops. Hence, IDM will just keep downloading all days and nights if I don't stop it myself.

The problem is, the downloaded file (stored in the temporary folder) is of .stream extension. Mediaplayer Classic can open it perfectly, but it'd be very inconvenient to have such extension since I don't think I can carry it around and play it on other computer.

I tried some video converters but all of them failed because the format is not supported.

So my questions are:

1. Is there a program specially made to download live rmtp video? IDM works, but the format is inconvenient.
2. How can I convert .stream file to other extension, say AVI?