# v4l2vp9dec Source: [https://docs.qualcomm.com/doc/80-70015-50/topic/v4l2vp9dec.html](https://docs.qualcomm.com/doc/80-70015-50/topic/v4l2vp9dec.html) The v4l2vp9dec plugin uses the V4L2 APIs to decode the video stream. This plugin uses the VP9 video decoder to provide hardware accelerated VP9 decoding on platforms that support it. It is based on the [GstVideoDecoder](https://gstreamer.freedesktop.org/documentation/video/gstvideodecoder.html) base class. ## Inheritance chain [GObject](https://docs.gtk.org/gobject/) → [GstObject](https://gstreamer.freedesktop.org/documentation/gstreamer/gstobject.html?gi-language=c) → [GstElement](https://gstreamer.freedesktop.org/documentation/gstreamer/gstelement.html?gi-language=c) → [GstVideoDecoder](https://gstreamer.freedesktop.org/documentation/video/gstvideodecoder.html) → GstV4l2VideoDec → v4l2vp9dec The following tables provide information on pad templates and element properties of v4l2vp9dec. For use cases, see [Video playback use cases](https://docs.qualcomm.com/doc/80-70015-50/topic/video-playback-use-cases.html). ## Pad configuration | Pad Name | Capabilities | Capabilities | Capabilities | | --- | --- | --- | --- | | SINK template: 'sink'

Availability: Always

Direction: sink

Availability: Always

Direction: source

| video/x-raw | format: | { (string)NV12, (string)NV21 } | | SRC template: 'src'

Availability: Always

Direction: source

Availability: Always

Direction: source

Availability: Always

Direction: source

| video/x-raw | framerate: | [ 0/1, 2147483647/1 ] | | | | | | | | | | | | | | | | ## Element configuration Note: For the current release, in the read-write properties, only **capture-io-mode** and **output-io-mode** are supported with **(5): dmabuf-import - GST\_V4L2\_IO\_DMABUF\_IMPORT** property. Table : Element properties of v4l2vp9dec | Property | Description | | --- | --- | | automatic-request-sync-point-flags: | Flags to use when automatically requesting sync points.

flags: readable, writable

Flags "GstVideoDecoderRequestSyncPointFlags" Default:
0x00000003, "corrupt-output+discard-input"
- (0x00000001): discard-input -
  GST_VIDEO_DECODER_REQUEST_SYNC_POINT_DISCARD_INPUT
- (0x00000002): corrupt-output -
  GST_VIDEO_DECODER_REQUEST_SYNC_POINT_CORRUPT_OUTPUT

| | automatic-request-sync-points | Automatically request sync points when required.

flags: readable, writable

Boolean. Default: false

| | capture-io-mode | Capture I/O mode (matches src pad).

flags: readable, writable

Enum "GstV4l2IOMode" Default: 0, "auto"
- (0): auto - GST_V4L2_IO_AUTO
- (1): rw - GST_V4L2_IO_RW
- (2): mmap - GST_V4L2_IO_MMAP
- (3): userptr - GST_V4L2_IO_USERPTR
- (4): dmabuf - GST_V4L2_IO_DMABUF
- (5): dmabuf-import - GST_V4L2_IO_DMABUF_IMPORT

| | device | Device location.

flags: readable

String. Default: "/dev/video0"

| | device-fd | File descriptor of the device.

flags: readable

Integer. Range: -1 - 2147483647 Default: -1

| | device-name | Name of the device.

flags: readable

String. Default: null

| | discard-corrupted-frames | Discard frames marked as corrupted instead of outputting
them.

flags: readable, writable

Boolean. Default: false

| | extra-controls | Extra v4l2 controls (CIDs) for the device.

flags: readable, writable

Boxed pointer of type "GstStructure"

| | max-errors | Maximum consecutive decoder errors before returning flow
error.

flags: readable, writable

Integer. Range: -1 - 2147483647 Default: 10

| | min-force-key-unit-interval | Minimum interval between force-keyunit requests in
nanoseconds.

flags: readable, writable

Unsigned Integer64. Range: 0 - 18446744073709551615 Default:
0

| | name | The name of the object.

flags: readable, writable, 0x2000

String. Default: "v4l2vp9dec0"

| | output-io-mode | Output side I/O mode (matches sink pad).

flags: readable, writable

Enum "GstV4l2IOMode" Default: 0, "auto"
- (0): auto - GST_V4L2_IO_AUTO
- (1): rw - GST_V4L2_IO_RW
- (2): mmap - GST_V4L2_IO_MMAP
- (3): userptr - GST_V4L2_IO_USERPTR
- (4): dmabuf - GST_V4L2_IO_DMABUF
- (5): dmabuf-import - GST_V4L2_IO_DMABUF_IMPORT

| | parent | The parent of the object.

flags: readable, writable, 0x2000

Object of type "GstObject"

| | qos | Handle Quality-of-Service events from downstream.

flags: readable, writable

Boolean. Default: true

| **Parent Topic:** [Display, camera, encode and decode plugins](https://docs.qualcomm.com/doc/80-70015-50/topic/display-plugins.html) Last Published: Oct 27, 2025 [Previous Topic v4l2h265enc](https://docs.qualcomm.com/bundle/publicresource/80-70015-50/topics/v4l2h265enc.md) [Next Topic Audio plugins](https://docs.qualcomm.com/bundle/publicresource/80-70015-50/topics/audio-plugins.md)