When I opened this:
http://cp401489-vh.akamaihd.net/i/iplaye...10_1_av.ts
I got:
An error occurred while processing your request.
Reference #216.a7d0d93f.1494085681.17f69f4

But:
http://cp401489-vh.akamaihd.net/i/iplaye...t1_1_av.ts
is fine.

What's the problem?

Sorry. We don't support whatever mucking around you are doing with BBC streams outside of get_iplayer. Thread closed.