Tvheadend

https://ffmpeg.org/ffmpeg-filters.html#scale_005fnpp
https://github.com/Svechnikov/ffmpeg-scale-cuda-problem

scale_cuda https://ffmpeg.org/ffmpeg-filters.html#toc-scale_005fcuda

ffmpeg -y -vsync 0 -hwaccel cuvid -c:v h264_cuvid -i input.mp4 -vf scale_cuda=1280:720 -c:a copy -c:v h264_nvenc -b:v 5M output.mp4

scale_npp http://underpop.online.fr/f/ffmpeg/help/scale_005fnpp.htm.gz

ffmpeg -y -vsync 0 -hwaccel cuvid -c:v h264_cuvid -i input.mp4 -vf scale_npp=1280:720 -c:a copy -c:v h264_nvenc -b:v 5M output.mp4

https://stackoverflow.com/questions/55687189/how-to-use-gpu-to-accelerate-the-processing-speed-of-ffmpeg-filter

nice presentation
https://on-demand.gputechconf.com/gtc/2018/presentation/s8601-nvidia-gpu-video-technologies.pdf

Thank you for sharing the document, really nice presentation, i followed the steps in the scale_cuda and scale_npp but unfortunately did not work for me, attached is tvheadend log for both attempts

i used below ffmpeg lines (tried to keep it simple for testing scaling function)

/usr/bin/ffmpeg -y -vsync 0 -loglevel debug -hwaccel cuvid -c:v mpeg2_cuvid -i pipe:0 -vf scale_cuda=1280:720 -c:a copy -vcodec h264_nvenc -b:v 5M -f mpegts pipe:1

/usr/bin/ffmpeg -y -vsync 0 -loglevel debug -hwaccel cuvid -c:v mpeg2_cuvid -i pipe:0 -vf scale_npp=1280:720 -c:a copy -vcodec h264_nvenc -b:v 5M -f mpegts pipe:1

appreciate if you can check the logs and guide me where is my mistake,thanks in advance

Get url of some channel with pass profile, and test in command line with input url from tvh and output

 -f mpegts udp://239.5.5.5:5555?pkt_size=188&localaddr=192.168.0.20

use vlc to watch results

https://www.red5pro.com/docs/plugins/restreamer/mpeg-ts-ingest-plugin/

or test
this scenario
https://superuser.com/questions/1614417/how-to-split-and-scale-streams-in-ffmpeg-with-cuda

Thank you for your reply, i tried testing the output with the command you provided and was able to see the stream in vlc but unable to correlate this with the down scale using nvenc encoder with -vf scale_cuda or -vf scale_npp

I also noticed that adding -vf scale_cuda =1280:720 to ffmpeg in command line gives below error (no such filter invalid argument)

[aac 0x556b1236dc40] Using a PCE to encode channel layout "5.1(side)"
[AVFilterGraph 0x556b123cb100] No such filter: 'scale_cuda'
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:0
[aac 0x556b1236dc40] Qavg: 116.596
[aac 0x556b1236dc40] 2 frames left in the queue on closing
Conversion failed!

while using -vf scale_npp=1280:720 only sound is coming and video output gives green screen (attached for your reference)

what say

ffmpeg -h encoder=h264_nvenc

Ffmpeg -hwaccel cuvid -resize 1280x720 -i INPUT -c:a copy -c:v h264_nvenc -b:v 5M OUTPUT

https://github.com/philipl/nv-video-info

Dear, please find attached the output of encoder h264_nvenc and the error log when using -resize parameter with cuvid decoder, seems that - resize is not recognized and also i have some error related to memory allocation

encoder h264_nvenc output is attached for your reference
- resize error log is also attached

thanks a lot for all your help

(Resize (width)x(height)) specified for input file #0 has not been used
for any stream. The most likely reason is either wrong type (e.g. a video option
with no video streams) or that it is a private option of some decoder which was
not actually used for any stream.

[mpeg2video  0x561e5ba64cc0] No decoder surfaces left
Error while decoding stream #0:0: Cannot allocate memory
[mpeg2video  0x561e5ba64cc0] No decoder surfaces left
Error while decoding stream #0:0: Cannot allocate memory
[mpeg2video  0x561e5ba64cc0] No decoder surfaces left
Error while decoding stream #0:0: Cannot allocate memory
Impossible to convert between the formats supported by the filter 'Parsed_null_0
 and the filter 'auto_scaler_0'
Error reinitializing filters!
Failed to inject frame into filter network: Function not implemented
Error while processing the decoded data for stream #0:0
[aac  0x561e5bab3b40] Qavg: 114.072
[aac @ 0x561e5bab3b40] 2 frames left in the queue on closing
Conversion failed!

No decoder surfaces left
reduce surfaces in all transcoding to 8 by default is 20
/read again https://tvheadend.org/boards/5/topics/45187/

Guessing problem is with poor options enabled in your ffmpeg binary

  --extra-cflags="-I/usr/local/cuda/include/" \
  --extra-ldflags="-L/usr/local/cuda/lib64/" \
  --bindir="$HOME/bin" \
  --enable-gpl \
  --enable-shared  \
  --enable-nonfree \
  --enable-cuda \
  --enable-nvenc \
  --enable-opengl \
  --enable-libnpp \
  --enable-libass \
  --enable-libfdk-aac \
  --enable-libfreetype \
  --enable-libmp3lame \
  --enable-libopus \
  --enable-libtheora \
  --enable-libvorbis \
  --enable-libvpx \
  --enable-libx264 \
  --enable-libx265

it's time to attach second GPU Quadro K420 have boundaries.

Thank you for all your help, people like you make this domain even more interesting ,thanks

following your provided presentation file, I think somehow i manage to do GPU scale using below ffmpeg in command line

ffmpeg -vsync 0 -c:v mpeg2_cuvid -i http://addre -vf "hwupload_cuda,scale_npp=640:480,hwdownload,format=nv12" -c:a aac -b:a 160k -ar 44100 -c:v h264_nvenc -b:v 1M -f mpegts udp://addre

it works!!

however tvheadend stream profile did not work when adding the same

/usr/bin/ffmpeg -vsync 0 -loglevel debug -c:v mpeg2_cuvid -i pipe:0 -vf "hwupload_cuda,scale_npp=640:480,hwdownload,format=nv12" -c:a aac -b:a 160k -ar 44100 -c:v h264_nvenc -b:v 1M -f mpegts pipe:1

I am getting below same error message :-( in tvheadend stream profile

spawn: Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:0

I started thinking the issue could be in tvheadend build (my version is HTS Tvheadend 4.3-1967~geb59284b8)

Thank you

Finally, i reconfigured ffmpeg with the libraries you provided and it works with below command in tvheadend

/usr/bin/ffmpeg -y -hwaccel cuvid -c:v mpeg2_cuvid -resize 640x480 -i pipe:0 -c:a aac -ac 2 -ar 44100 -b:a 128k -c:v h264_nvenc -b:v 700k -f mpegts pipe:1

still -vf sacle_npp and scale_cuda are not working in tvheadend, but i do not care at least it is now working with mpeg2_cuvid decoder BIG THANK YOU

Install Cuda it include also video driver, maby some libraries missing
https://developer.nvidia.com/cuda-downloads?target_os=Linux&target_arch=x86_64&Distribution=Ubuntu

With this command line expect some artifacts on output when there is more motion.
always set framerate and surfaces

lot of time ago there was so many web sites with with can generate command line for FFPEG now thera are few of them but limited
http://www.mackinger.at/ffmpeg/

ffmpeg -i INPUT -c:v libx264 -b:v 4M -minrate 2M -preset ultrafast -vf scale=640:-1 -c:a aac -b:a 64K _converted.mp4

p.s.
try now in place of FFMPEG to use GStreamer commandline is different but who knows
https://developer.download.nvidia.com/embedded/L4T/r32_Release_v1.0/Docs/Accelerated_GStreamer_User_Guide.pdf
http://lifestyletransfer.com/how-to-install-nvidia-gstreamer-plugins-nvenc-nvdec-on-ubuntu/

next
https://github.com/rigaya/NVEnc

https://github.com/markus-perl/ffmpeg-build-script
ffmpeg build script with all extras , without AMF