Tag: H.265

Media Foundation API primitive styling of WinRT windows.mediaCodec

An interesting Media Foundation question on StackOverflow: Weird connection between CoInitializeSecurity() and Media Foundation Encoders A developer has reasons to discard standard COM security and go RPC_C_IMP_LEVEL_ANONYMOUS. Surprisingly this has effect on Windows Media Foundation API in the part of available codecs (Media Foundation Transforms). Sample code: CoInitializeSecurity line in the code above removes the…

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A few interesting observations about NVIDIA Turing video encoders

GPU NVIDIA GeForce GTX 1080 Ti NVIDIA GeForce GTX 1660 Ti Microarchitecture Pascal Turing H.264 NV_ENC_CAPS_SUPPORT_FIELD_ENCODING Yes No H.264 NV_ENC_PRESET_HP_GUID entropyCodingMode NV_ENC_H264_ENTROPY_CODING_MODE_CAVLC NV_ENC_H264_ENTROPY_CODING_MODE_CABAC H.265/HEVC NV_ENC_CAPS_NUM_MAX_BFRAMES 0 5 H.265/HEVC NV_ENC_CAPS_SUPPORT_TEMPORAL_AQ No Yes Apart from the capabilities, a whitepaper mentions these H.265/HEVC improvements: Turing GPUs also ship with an enhanced NVENC encoder unit that adds support for…

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Media Foundation incorrectly reports resolution for H.265/HEVC video tracks

Another problem (bug) with Microsoft Media Foundation MPEG-4 Media Source H.265/HEVC handler is that it ignores conformance_window_flagflag and values from H.265’s seq_parameter_set_rbsp (see H.265 spec, F. General sequence parameter set RBSP syntax). The problem might or might not be limited to fragmented MP4 variants. It is overall questionable whether it has been a good idea…

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