v4l2compress_omx latency increases with time

[jrannou]

I am developing application with Pi4 and usb camera.
I am using your v4l2tools and v4l2rtspserver.

If i use v4l2compress_omx to compress the video in h264 format there is a latency about 2s at the beginning and the latency increase to 12s after 1 hour.
If i use v4l2compress (sw compressor) i have no latency but the CPU is very loaded.

Does someone have the same phenomenon ?
Is there a solution to reduce and stabilize the latency ?