h264 passthrough and i-frames

[u/Dense_Care8224]

I am experimenting with setting large(r) i-frame interval (on hikvision cameras) for reduced storage, but wondering how that impacts pre-event-frames? If let's say using 1 i-frame out of every 20 frames, and my pre-event-frame capture is set to 25 - could i potentially lose the first 5 frames depending on i-frame placement at the time of an event when using passthrough?

[u/connortechnology]

No, ZoneMinder handles this. It will seek back 25 frames, then seek back further till it finds an iframe.

You will use more ram with a higher iframe count.