[Live-devel] mpeg and user data

[Sigismondo Boschi]

Ross Finlayson wrote:
>> we have developed a streaming server based on live555, that gets mpeg4 
>> frames and streams them as a MPEG elementary stream.
>>
>> Now I need to add some user data to each frame.
> 
> Is this 'user data' really 'per frame' - i.e., tightly associated with 
> the MPEG-4 frame data?  If so, then the best way to do this would be to 
> try to find some provision in the MPEG-4 video specification for such 
> data, and just carry it inside the MPEG-4 frame data somehow.  (I don't 
> know whether the MPEG-4 spec has any provision for this, though.)

Yes, you are right - I have found finally the mpeg4 way to do this. I am 
  trying to inject user-data frames in the mpeg4 stream, that is frames 
starting with USER_DATA_START_CODE (0x000001B2). Actually, it seems to 
work just fine!

It has taken a lot to me to figure out this info, but then I have 
discovered that Sony and Axis cameras add trigger data in this way.

That's much easier than my first idea. Thanks for your time,
    Sigismondo




-- 
------------------------------------------------------------------
Sigismondo Boschi, PhD                     TotalWire S.r.l.
s.boschi at totalwire.it                      http://www.totalwire.it
cell: +39 346 7911896                      tel:  +39 051 302696
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