Controlling number of frames in video with Splitmuxsink split-now

Hi all,

I am pushing frames onto a pipeline as follows:

app_src --> ... ---> splitmuxsink

When I push frames onto app_src after every 15th frame I call "split-now"
on splitmuxsink.

My expectation is the video will have 15 frames in it. But when I check, it
has exactly 30 frames every time.

The output to screen shows 2 or 3 calls to split-now  before the
split-mux-sink format-location-callback output saying it's saving a video.

Could it be that the split-now calls are occurring too frequently so
splitmux sink is setting the preferred time that it can save data to the
next feasible split-now point which happens to encompass two split-now
calls, therefore 30 frames are in the video ?

Thanks.

Dwight Kulkarni