GPU-Accelerated Video Encoding for Tube Site

I need an expert in ffmpeg & CUDA for fast video encoding. Optimized encoding commands need to generate MP4 files that are similar in size to downloaded videos, but the encoding process must be expedited via GPU usage. Key Requirements: * The result should be in MP4 format. * Video quality and encoding speed are crucial. * The target video resolution is 480p. Ideal Skills: * Extensive knowledge of ffmpeg and CUDA. * Experience in video encoding, particularly fast encoding. * Detailed understanding of optimizing for video quality and speed under specific resolution constraints(i.e, 480p in this case).