kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder 37 libavcodec/videotoolbox.c #ifndef kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder 728 libavcodec/videotoolbox.c kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder,