@Andrew Sorry to bother you again on a subject you have already tried to explain over and over again. Reading this page: https://trac.ffmpeg.org/wiki/HWAccelIntro it is my understanding that when decoding (note: from here on I am only referring to decoding/playback!) you can use the "-hwaccel" option without any other settings. If the media file used supports hardware acceleration, then it will be used automatically without anything else to do. If it is not supported it will automatically switch to software decoding. There is no need to specify the device (because a device is automatically selected, even if it is not the preferred one), so it would be a generic feature that decides for itself when to run. Question, how can I impose "-hwaccel" when compiling CinGG? Another thing concerns decoding with Vulkan. Again, these are generic instructions and I would like to test it, however it requires device initialization, to be declared explicitly (although a generic term is fine: "vulkan=vk:0") and a few other options. See here: https://trac.ffmpeg.org/wiki/HWAccelIntro#Vulkan The question is always the same: How can I compile vulkan in CinGG to do some tests?