What I want is to record last n seconds before trigger occurs , means suppose i have set n as 30 sec so the data would be continuously storing in a circular buffers which will have last n secons and when trigger occurs first this circular buffer would be store and then incoming data .
You may see this example using circular buffer from std::chrono for the same purpose (using opencv with gstreamer backend).
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Sorry for the confusion, the circular buffer in the example above was from boost (std::chrono was unrelated, just messed up when posting).
You can find an example for this here (in C): H.264 backlog recording example ($1760) · Snippets · freedesktop.org / Snippets · GitLab
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