I have several Lumix GH4 cameras which I use to record classical and jazz concerts. I record at 4K 100Mbps, IPB compression, and I end each concert with ~80GB per camera.

All my projects are destined for web or DVD, and I would prefer to record at ~50Mbmps. On our Canon rig, we can use Magic Lantern to select our preferred bitrate (sort of), so that we can keep the transfer/editing/processing workflow as efficient as we need.

**Is it possible to record at a lower bitrate in 4K on a GH4?**

Thank you.

Only in HD modes you have different bitrate choices and since as far as I know no hack exists for the GH4 then, no, you can't choose a lower bitrate.