Can the identity plugin cause frame drop?

pisymbol . pisymbol at
Tue Jul 9 01:07:47 UTC 2019

On Mon, Jul 8, 2019 at 8:47 PM Michael Gruner <michael.gruner at>

> The handoff will be emitted for every buffer and won’t drop buffers.
> Recall, however, that signals block. I suspect that you have an indirect
> buffer drop on nvcamerasrc.
> Nvcamera src has an internal (limited) buffer queue. If you block the
> processing on the signal callback for too long, the queue will start
> filling up and, eventually, drop buffers. I believe that you can increase
> this queue size a lot, but if your signal processing takes more than 33ms
> (assuming a 30fps capture), eventually you’ll end up losing buffers in the
> same way.
> Make sure the processing your are doing on the callback actually is below
> your period deadline. If it’s below, but high, I recommend adding a queue
> after the identity to split processing in different threads.

Michael, after the identity? Not before?

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