[FFmpeg-user] libavformat, RTSP: periodically read last available frame of live stream

[Sandro Mani]

Hello,

I would like to periodically (say every second) grab the latest frame 
from a rtsp live stream of a webcam. I am able to successfully open the 
stream and read and decode frames, however if I read one frame every 
second, I am still reading subsequent frames (as opposed to frames which 
are i.e. one second apart). I guess I need to seek to the last available 
frame before reading the next frame. Can anyone point out how this can 
be done?

For reference, my code is here: [1] [2].

Thanks for any inputs.

Sandro


[1] http://smani.fedorapeople.org/VideoCapture.hpp
[2] http://smani.fedorapeople.org/VideoCapture.cpp