Hi,
We don’t support ffmpeg with hardware acceleration on Jetson platforms. There is a community contribution. Please check FAQ
Q: Is hardware acceleration enabled in ffmpeg?
You may consider to use tegra_multimedia_api or gstreamer.
NVENC and NVDEC are independent hardware engines for video encoding/decoding. Please check Tegra X1 SoC Technical Reference Manual in
https://developer.nvidia.com/embedded/downloads#?search=trm