To enable streaming in HDS format, add the /media=hds/ parameter to the link. The link will return an xml manifest to the .f4m file.
Various options are available::
The actual segment size will vary, if there are more than ten seconds between keyframes - there may be empty segments.
Example:
http://video.ahcdn.com/key=sYQ7f-eRrPKBIbP05Tac0Q/media=hdsA/output.mp4