Check if opencv is using the GPU enabled FFMPEG
I am trying to use the GPU version of ffmpeg with opencv. I got the GPU enabled version of FFMPEG from cloning https://git.ffmpeg.org/ffmpeg.git . I compiled opencv by specifying the paths of the GPU version.
When I run ffmpeg, I get:
ffmpeg version N-91329-g830695b Copyright (c) 2000-2018 the FFmpeg developers
built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.6) 20160609
configuration: --enable-cuda --enable-cuvid --enable-nvenc --enable-nonfree --enable-libnpp --extra-cflags=-I/usr/local/cuda/include --extra-ldflags=-L/usr/local/cuda/lib64 --enable-shared --disable-static
libavutil 56. 18.102 / 56. 18.102
libavcodec 58. 20.103 / 58. 20.103
libavformat 58. 17.100 / 58. 17.100
libavdevice 58. 4.101 / 58. 4.101
libavfilter 7. 25.100 / 7. 25.100
libswscale 5. 2.100 / 5. 2.100
libswresample 3. 2.100 / 3. 2.100
Hyper fast Audio and Video encoder
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...
When I run getBuildInformation from opencv I get:
Video I/O:
DC1394 1.x: NO
DC1394 2.x: YES (ver 2.2.4)
FFMPEG: YES
codec: YES (ver 58.20.103)
format: YES (ver 58.17.100)
util: YES (ver 56.18.102)
swscale: YES (ver 5.2.100)
resample: NO
gentoo-style: YES
GStreamer: NO
OpenNI: NO
OpenNI PrimeSensor Modules: NO
OpenNI2: NO
PvAPI: NO
GigEVisionSDK: NO
UniCap: NO
UniCap ucil: NO
V4L/V4L2: NO/YES
XIMEA: NO
Xine: NO
gPhoto2: NO
I assume that everything is compiled properly because the ffmpeg versions match. However when I run a small decoding program to test whether ffmpeg uses GPU or not, I do not see the program on nvidia-smi.
As another observation, the FFMPEG version mentioned above appears on nvidia-smi (uses 378 MB) when running
ffmpeg -vsync 0 -c:v h264_cuvid -i /home/user/video.mp4 -f rawvideo output.yuv
Is there any mistake in my procedure? How else can I validate my results? Any help would be greatly appreciated! Thank you!