Hi Javier, On Wed, 2018-03-14 at 15:35 +0100, Javier Martin wrote: [...] > The encoder is running on a different system with an older 4.1.0 kernel. > Altough the firmware version in the code is 3.1.1 as well. > > Do you think I should try updating the system in the encoder to kernel > 4.15 too and see if that makes any difference? I don't think that should matter. It'd be more interesting if GOP size has a significant influence. Does the Problem also appear in I-frame only streams? regards Philipp