Recording previous few seconds of a live-stream

[puneet]

Hi,

I am writing a live stream to a .mp4 file using the gstreamer APIs. My
pipeline is appsrc --> x264enc --> mp4mux --> filesink.  I capture frames
from a webcam, put a timestamp and push the buffer to appsrc.  This push of
buffer happens only at certain points of time, when there is a certain event
(in video), otherwise, I do not record frames.  What I would like to achieve
is to record previous 2 seconds of the event whenever I start recording. 
Currently, I have implemented this by maintaining a queue of buffers of past
2 seconds and then push them all in one go when I have to record.  Although
this works, it consumes almost 1 ms per push (perhaps because I am using
python wrappers), so at 15 fps pushing 30 buffers means 30 ms delay.  Is
there are better way of achieving this?

Thanks,
Puneet



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