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
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Sigismondo Boschi, PhD TotalWire S.r.l.
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