(1): Main10 - GST_V4L2_H265_VIDENC_MAIN10_PROFILE (3): FREXT - GST_V4L2_H265_VIDENC_FREXT_PROFILE Property Meaning Type and Range Example/Notes Platforms qp-range Sets quantization paramenter range for P, I and B frame String, 1 to 51 ...
If your device can perform more than one of the above functions, a separate V4L2 device should be registered for each of the supported functions. In V4L2, however, any of the registered devices can be called upon to function in any of the supported modes. What it comes down to is that,...
Thetypefield describes the type of I/O to be done; it will usually be eitherV4L2_BUF_TYPE_VIDEO_CAPTUREfor a video acquisition device orV4L2_BUF_TYPE_VIDEO_OUTPUTfor an output device. There are other types, but they are beyond the scope of this article. If the application wants to use ...
For video capture (and output) devices, thepixfield of the union is of interest. This is thev4l2_pix_formatstructure seen in the previous installment; the driver should fill in that structure with the current hardware settings and return. This call should not normally fail unless something is ...
capabilityis a set of capability flags; the only one currently defined isV4L2_CAP_TIMEPERFRAMEwhich indicates that the device can vary its frame rate.capturemodeis another flag field with exactly one flag defined:V4L2_MODE_HIGHQUALITY, intended to put the hardware into a high-quality mode suita...
V4L2_CAP_AUDIO: It can capture audio data. V4L2_CAP_RADIO: It is a radio device. V4L2_CAP_READWRITE: It supports theread()and/orwrite()system calls; very few devices will support both. It makes little sense to write to a camera, normally. ...