FFMpeg hardware acceleration.

Is there a way to make the encoder parameter configurable? This could make rendering time much faster.
For AMD GPU user they could use h264_amf or hevc_amf encoder.

https://github.com/3b1b/manim/blob/e336cf5ddc1b6766448189e2849b63b055e1e156/manimlib/scene/scene_file_writer.py#L421

Look at manimlib/scene/scene_file_writer.py line 421 where the encoder is currently set. Understand how FFmpeg hardware acceleration encoders like h264_amf or hevc_amf work. Check if there's a configuration system for render settings. The goal is to make the encoder parameter configurable, likely via a command-line argument or config file, to allow users to specify hardware-accelerated encoders.

Written by the indexing model from the issue text.