A few silly questions on topics already addressed several times. I was reading about hardware acceleration in ffmpeg. In my system ffmpeg I have: $ ffmpeg -hwaccels ffmpeg version n7.1 Copyright (c) 2000-2024 the FFmpeg developers built with gcc 14.2.1 (GCC) 20250207 configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-amf --enable-avisynth --enable-cuda-llvm --enable-lto --enable-fontconfig --enable-frei0r --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libdav1d --enable-libdrm --enable-libdvdnav --enable-libdvdread --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgsm --enable-libharfbuzz --enable-libiec61883 --enable-libjack --enable-libjxl --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libplacebo --enable-libpulse --enable-librav1e --enable-librsvg --enable-librubberband --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpl --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-nvdec --enable-nvenc --enable-opencl --enable-opengl --enable-shared --enable-vapoursynth --enable-version3 --enable-vulkan libavutil 59. 39.100 / 59. 39.100 libavcodec 61. 19.100 / 61. 19.100 libavformat 61. 7.100 / 61. 7.100 libavdevice 61. 3.100 / 61. 3.100 libavfilter 10. 4.100 / 10. 4.100 libswscale 8. 3.100 / 8. 3.100 libswresample 5. 3.100 / 5. 3.100 libpostproc 58. 3.100 / 58. 3.100 Hardware acceleration methods: vdpau cuda vaapi qsv drm opencl vulkan If I try the same command with ffmpeg contained in .../thirdparty/ffmpeg-7.0 I get: ./ffmpeg -hwaccels Hardware acceleration methods: vdpau cuda vaapi vulkan So I guess OpenCL; Qsv and drm can only be obtained by manually compiling them. With what exact options in ./configure? (I never know when to use “--with-” and when to use “--enable-”). “drm” can serve in CinGG? Another thing: vulkan is already included in CinGG, but I have never been able to activate the device and get it working. How to do that? With system ffmpeg I can activate it without any problems. I am attaching the part of ffmpeg's documentation regarding hardware acceleration. The following part (regarding decoding) seems important to me: "Note that most acceleration methods are intended for playback and will not be faster than software decoding on modern CPUs. Additionally, ffmpeg will usually need to copy the decoded frames from the GPU memory into the system memory, resulting in further performance loss. This option is thus mainly useful for testing." As usual, I thought it would be a good thing to have playback in hardware but it is not. (However, there is a video of Adam where he manages to get better decoding with his Nvidia: https://www.youtube.com/watch?v=IZdJqrObnik).