what's the deference between Nvidia video converter in tegra media low level api pixel format V4L2_PIX_FMT_YUV420M and stantard X264_CSP_I420

Please refer to the sample based on ~/tegra_multimedia_api/samples/09_camera_jpeg_capture and run
./camera_jpeg_capture --pre-res 1920x1080
main.cpp (22.3 KB)