[asterisk-dev] why no sequence numbers with video frames over IAX ?

[Kevin P. Fleming]

Luigi Rizzo wrote:

> ok thanks for the clarification.
> The absence of sequence number makes it slightly difficult to detect
> missing frames though... 

Not really... sequence numbers (especially in the video media world)
aren't a reliable way to order packets and check for missing packets
anyway, as sequence numbers can be 'consumed' by non-media frames in
some situations, and IIRC there are also video formats where multiple
frames can be sent with the same sequence number.

Using the timestamps and duration of the frames allows the receiver to
determine if any time period is missing media.

-- 
Kevin P. Fleming
Director of Software Technologies
Digium, Inc. - "The Genuine Asterisk Experience" (TM)