I believe from what I've read that this card's driver doesn't support the features after trying all known troubleshooting methods.

ffmpeg -i uservideoRendered.mp4 -filter:v hwupload_cuda,scale_npp=w=1920:h=1080:format=nv12:interp_algo=lanczos,hwdownload -c:v hevc_nvenc -profile main -preset slow -rc vbr_hq -c:a copy uservideoRendered.mp4-test

ffmpeg -i uservideoRendered.mp4 -filter:v hwupload_cuda,scale_npp=w=1920:h=1080:format=nv12:interp_algo=lanczos,hwdownload -c:v hevc_nvenc -profile:v main -preset fast -rc vbr_hq -c:a copy uservideoRendered-test.mp4

Could not initialize the CUDA driver API
[AVFilterGraph @ 0x39d9500] Error initializing filter 'hwupload_cuda'
Error reinitializing filters!
Failed to inject frame into filter network: Unknown error occurred
Error while processing the decoded data for stream #0:0

sudo apt-get install nvidia-cuda-toolkit

ffmpeg -i uservideoRendered.mp4 -filter:v hwupload_cuda,scale_npp=w=1920:h=1080:format=nv12:interp_algo=lanczos,hwdownload -c:v hevc_nvenc -profile main -preset fast -rc vbr_hq -c:a copy uservideoRendered-test.mp4
[AVFilterGraph @ 0x31465e0] No such filter: 'scale_npp'
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:0
Conversion failed!


ffmpeg -i uservideoRendered.mp4 -filter:v hwupload_cuda,scale_npp=w=1316:h=1080:format=yuv420p:interp_algo=lanczos,hwdownload,format=yuv420p -c:v hevc_nvenc -profile main -preset fast -rc vbr_hq -c:a copy uservideoRendered-test.mp4
[AVFilterGraph @ 0x32d7860] No such filter: 'scale_npp'
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:0


/home/one/ffmpeg-3.3.2/ffmpeg -i uservideoRendered.mp4 -filter:v hwupload_cuda,scale_npp=w=1316:h=1080:format=yuv420p:interp_algo=lanczos,hwdownload,format=yuv420p -c:v hevc_nvenc -profile main -preset fast -rc vbr_hq -c:a copy uservideoRendered-test.mp4

=========

ffmpeg -i uservideoRendered.mp4 -i "/pathlogo-creation/2017-good-final/ORDER150f1.png" -filter_complex overlay=x=w-tw-10:y=h-th-10 uservideoRendered.mp4-branded.mp4

[nvenc_hevc @ 0x2659760] This encoder is deprecated, use 'hevc_nvenc' instead
Cannot load NvEncodeAPIGetMaxSupportedVersion
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

ffmpeg -i uservideoRendered.mp4 -i "/pathlogo-creation/2017-good-final/ORDER150f1.png" -filter_complex overlay=x=w-tw-10:y=h-th-10 uservideoRendered.mp4-branded.mp4

Cannot load NvEncodeAPIGetMaxSupportedVersion
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height


ffmpeg -i $sourcevideo -i "$watermarkfile" -c copy  -c:v h264_nvenc -profile high444p -pixel_format yuv444p -preset default -filter_complex overlay=W-w-25:H-h-25 $outputfile

Please use -profile:a or -profile:v, -profile is ambiguous



ffmpeg -i $sourcevideo -i "$watermarkfile" -c copy  -c:v hevc_nvenc -profile:a main -preset slow -filter_complex overlay=W-w-25:H-h-25 $outputfile
[NULL @ 0x31b5a60] [Eval @ 0x7ffd44eff2d0] Undefined constant or missing '(' in 'main'
[NULL @ 0x31b5a60] Unable to parse option value "main"
[NULL @ 0x31b5a60] Error setting option profile to value main.
Error setting up codec context options.

ffmpeg -i $sourcevideo -i "$watermarkfile" -c copy -c:v hevc_nvenc -profile:v main10 -preset slow -filter_complex overlay=W-w-25:H-h-25 $outputfile
Cannot load NvEncodeAPIGetMaxSupportedVersion
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

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