On 11/26/2013 12:34 AM, Dídac Pérez wrote:
Hi all,
I am using ffmpeg C++ libraries for connecting to network IP cameras
and retrieve the video stream through RTSP. I need to synchronize the
video frames to another video stream whose frames have timestamps that
come from a GPS signal. The problem is that I am not able to find the
absolute timestamp of the frames I get from the cameras. pts/dts
values are zero-based relative to the first frame, but I don't know
how to know the absolute timestamps (for instance, relative to 1 Jan
1900). In addition, I don't know if it is actually possible.
Please, I am stuck in this point and I need urgent help with this, and
I will really appreciate any help from you. Thank you so much.
Kindest regards,
Dídac Pérez
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RTCP Sender Reports can be used and ip cams usually include them
in-band. http://tools.ietf.org/html/rfc3550#section-6.4.1
THe camera manufacturer should have more info on setting up a local
network clock for the cameras to sync their clocks to.
Using Axis? they have so much documentation that you can accomplish
everything you can imagine.
Andy
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