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-rw-r--r--Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst4
1 files changed, 3 insertions, 1 deletions
diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
index 76ebf86b9d0b..7ee8ae073b91 100644
--- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
@@ -3719,7 +3719,9 @@ enum v4l2_mpeg_video_hevc_size_of_length_field -
* - ``V4L2_MPEG_VIDEO_HEVC_START_CODE_NONE``
- 0
- Selecting this value specifies that HEVC slices are passed
- to the driver without any start code.
+ to the driver without any start code. The bitstream data should be
+ according to :ref:`hevc` 7.3.1.1 General NAL unit syntax, hence
+ contains emulation prevention bytes when required.
* - ``V4L2_MPEG_VIDEO_HEVC_START_CODE_ANNEX_B``
- 1
- Selecting this value specifies that HEVC slices are expected