Video for Linux Two API Specification: Revision 0.24
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# 6.4. Experimental API Elements

The following V4L2 API elements are currently experimental and may change in the future.

- Video Output Overlay (OSD) Interface, Section 4.4.

- `V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY`, enum v4l2_buf_type, Table 3-2.

- `V4L2_CAP_VIDEO_OUTPUT_OVERLAY`, `VIDIOC_QUERYCAP` ioctl, Table 2.

- `VIDIOC_ENUM_FRAMESIZES` and `VIDIOC_ENUM_FRAMEINTERVALS` ioctls.

- `VIDIOC_G_ENC_INDEX` ioctl.

- `VIDIOC_ENCODER_CMD` and `VIDIOC_TRY_ENCODER_CMD` ioctls.

- `VIDIOC_DBG_G_REGISTER` and `VIDIOC_DBG_S_REGISTER` ioctls.

- `VIDIOC_G_CHIP_IDENT` ioctl.

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