To enable streaming in DASH format, add the / media = dash / parameter to the link. The link will return an xml manifest to the manifest.mpd file.
Various options are available::
The actual segment size will vary, if there are more than ten seconds between key frames - there may be empty segments.
Example:
http://video.ahcdn.com/key=rF2ePSWHNL5wirg307aOqQ/media=dash/output.mp4