Hi, There are V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING controls in V4L2 extended codec controls. [1] There are various layer structures. For example, the typical 3 layer structure is shown in https://www.w3.org/TR/webrtc-svc/#L1T3*. The document doesn't state the details about the layer structure that will be produced by a driver with the control. Is the layer structure up to a driver? Or must a driver produce a predetermined layer structure? [1] https://www.kernel.org/doc/html/latest/userspace-api/media/v4l/ext-ctrls-codec.html?highlight=V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING Best Regards, -Hiro
