Tag: Video

A few interesting observations about NVIDIA Turing video encoders

Posted on July 25, 2019July 29, 2019 by Roman

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

Posted on July 17, 2019July 17, 2019 by Roman

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.7.3.2.2.1 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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CleanPoint markup fun with a fragmented MP4 file and Media Foundation MPEG-4 Source

Posted on June 29, 2019 by Roman

MPEG-4 Media Foundation Source stubbornly keeps marking a second video sample with a MFSampleExtension_CleanPoint flag even though nothing suggests that the video frame is an IDR frame. The actual video frame is a P frame both in terms of MP4 box formatting and contained NAL units (the video is in fact an “infinite GOP” flavor…

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Use of ICodecAPI interface with a video encoder managed by Media Foundation Sink Writer instance

Posted on June 8, 2019 by Roman

A bump of StackOverflow post about Media Foundation design flaw related to video encoding. Set attributes via ICodecAPI for a H.264 IMFSinkWriter Encoder I am trying to tweak the attributes of the H.264 encoder created via ActivateObject() by retrieving the ICodecAPI interface to it. Although I do not get errors, my settings are not taken…

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State of video remoting

Posted on May 4, 2019May 4, 2019 by Roman

Some things are working decently well… A monitor of one system is remoted to another system where the latter is… Xbox One X. Perceivable latency with 1920×1080@60 monitor resolution is under 2 video frames even though there are so many things happening in between.

Video compression in AVerMedia Live Gamer Ultra GC553

Posted on April 7, 2019April 8, 2019 by Roman

“The next generation of game capture is here.” The device addresses needs of real time capture of video signal: offering a pass-through HDMI connection the box provides a video capture sink with USB 3.1 Type C interface and makes the video signal available to video capture applications via standard DirectShow and Media Foundation APIs. I…

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Infrared Camera in Media Foundation

Posted on March 3, 2019March 3, 2019 by Roman

The screenshot above shows Surface Pro tablet’s infrared camera (known as “Microsoft IR Camera Front” on the device) captured live, encoded and streamed (everything is hosted by Microsoft Media Foundation Media Session by this point) over network using WebSockets into Chrome’s HTML5 video tag by means of Media Source Extensions (MSE). Why? Because why not.…

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