Draxen's recorder

Draxen’s Recorder is an in-game recording mod designed to capture Minecraft gameplay without heavily affecting your game’s performance. It focuses on smooth recording, high-quality output, and keeping your gameplay experience responsive while recording.

f9/f10 - start/stop recording f7 - start streaming

Features can include lossless-quality recording, high-FPS capture, low performance overhead, and streaming support, all directly from Minecraft.