Workaround mesa (amd and intel driver issue): use hevc when mkv is used since mesa doesn't support global headers for h264
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@@ -106,3 +106,5 @@ Support I915_FORMAT_MOD_Y_TILED_CCS (and other power saving modifiers, see https
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Test if p2 state can be worked around by using pure nvenc api and overwriting cuInit/cuCtxCreate* to not do anything. Cuda might be loaded when using nvenc but it might not be used, with certain record options? (such as h264 p5).
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nvenc uses cuda when using b frames and rgb->yuv conversion, so convert the image ourselves instead.-
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Mesa doesn't support global headers (AV_CODEC_FLAG_GLOBAL_HEADER) with h264... which also breaks mkv since mkv requires global header.
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