[Live-devel] Trick play with scrambled content

[Paul Osborne]

Trick play of clear streams by re-pidding 
video to 0xe0 (as suggested in other posts) works OK for a number of MPEG2 transport streams we have been testing with.

I am interested in trick play of scrambled/encrypted content as produced by typical conditional access or DRM systems.

Normal playout of encrypted streams and pause works well but 
trick play of _encrypted_ streams does not work. 

During trick play ... 

- the streams don't contain any ECMs (Entitlement Control Messages) 
special TS packets for conditional access/DRM 
- the transport stream scramble codes in the TS packet header have been 
reset 

It looks likely the server remultiplexes the I 
frames during trick play. 

I think the basic indexing process is working 
OK with the encrypted file as enough information is in the clear to spot the I frame start codes. 

Send instant messages to your online friends http://au.messenger.yahoo.com 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.live555.com/pipermail/live-devel/attachments/20080514/e5a16369/attachment.html>