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Multi-GPU (Vulkan decoders on several Vulkan devices) - #512
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vulkanN uses the Vulkan device N (e.g. internal+vulkan0+vulkan1), vulkan the default device, up to 2 decoders on a device and 8 decoders. auto uses all discrete GPUs, else the first GPU, with a second decoder on big GPUs. A requested Vulkan device which is not available stops the processing.
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Follow-up of #511 (2 vulkan decoders on the same device).
Decoder values
vulkan: default Vulkan device (index 0), as before.vulkanN: Vulkan device N. The index is the one used by FFmpeg (-init_hw_device vulkan:N) and shown byvulkaninfo.internal+vulkan+vulkan(as in Decoding: GPU and CPU together faster with big GPUs #511) orinternal+vulkan0+vulkan0+vulkan1. Values can be in any order.auto
The list of devices comes from the instance of the default device, which was already created for the detection. No other device is created for the detection.