nvidia – ffmpeg wit nvenc does not seem to utilize my GPU
I tried to convert a high-resolution video to 2k. I used this command:
ffmpeg -i input_video.mp4 -vf scale=1920:1080 -c:v h264_nvenc -preset slow -b:v 8M output_video.mp4
Based on the top and nvidia-semi results, my CPU was at maximum utilization, but my GPU was barely used. The ffmpeg process only used about 240 MiB of vram.
nvidia-smi dmon did show lots of enc activity. But the low vram usage and high CPU utilization makes me wonder if ffmpeg is fully utilize my GPU.
nvidia-smi dmon
# gpu pwr gtemp mtemp sm mem enc dec jpg ofa mclk pclk
# Idx W C C % % % % % % MHz MHz
0 - 74 - 6 8 66 0 - - 3504 420
0 - 74 - 6 8 71 0 - - 3504 420
0 - 74 - 6 8 70 0 - - 3504 420
0 - 74 - 6 8 71 0 - - 3504 420
0 - 74 - 6 7 63 0 - - 3504 420
0 - 74 - 5 7 56 0 - - 3504 420
0 - 74 - 6 8 70 0 - - 3504 420
0 - 74 - 6 8 67 0 - - 3504 420
0 - 74 - 6 8 69 0 - - 3504 420
0 - 74 - 6 8 71 0 - - 3504 420
0 - 74 - 6 8 68 0 - - 3504 420
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