Gst-nvvideo4linux2¶
DeepStream extends the open source V4L2 codec plugins (here called Gst-v4l2) to support hardware-accelerated codecs.
Decoder¶
The OSS Gst-nvvideo4linux2 plugin leverages the hardware decoding engines on Jetson and DGPU platforms by interfacing with libv4l2 plugins on those platforms. It supports H.264, H.265, JPEG and MJPEG formats. The plugin accepts an encoded bitstream and uses the NVDEC hardware engine to decode the bitstream. The decoded output is in NV12 format.
Note
When you use the v4l2 decoder for decoding JPEG images, you must use the open source jpegparse plugin before the decoder to parse encoded JPEG images.
Inputs and Outputs¶
Inputs
An encoded bitstream. Supported formats are H.264, H.265, JPEG and MJPEG
Control Parameters
gpu-id
num-extra-surfaces
skip-frames
cudadec-memtype
drop-frame-interval
Output
Gst Buffer with decoded output in NV12 format
Features¶
The following table summarizes the features of the Gst-nvvideo4linux2 decoder plugin.
Feature |
Description |
Release |
|---|---|---|
Supports H.264 decode |
— |
DS 4.0 |
Supports H.265 decode |
— |
DS 4.0 |
Supports JPEG/MJPEG decode |
_ |
DS 4.0 |
User-configurable CUDA memory type (Pinned/Device/Unified) for output buffers |
— |
DS 4.0 |
Gst Properties¶
The following table summarizes the Gst properties of the Gst-nvvideo4linux2 decoder plugin.
Property |
Meaning |
Type and Range |
Example/Notes |
Platforms |
|---|---|---|---|---|
gpu-id |
Device ID of GPU to use for decoding. |
Integer, 0 to 4,294,967,295 |
gpu-id=0 |
dGPU |
num-extra-surfaces |
Number of surfaces in addition to min decode surfaces given by the V4L2 driver. |
Integer, 1 to 24 |
num-decode-surfaces=24 Default: 0 |
dGPU Jetson |
skip-frames |
Type of frames to skip during decoding. Represented internally by enum SkipFrame. 0 (decode_all): decode all frames 1 (decode_non_ref): decode non-ref frames 2 (decode_key): decode key frames |
Integer, 0, 1, or 2 |
skip-frames=0 Default: 0 |
dGPU Jetson |
drop-frame-interval |
Interval to drop the frames, e.g. a value of 5 means the decoder receives every fifth frame, and others are dropped. |
Integer, 1 to 30 |
Default: 0 |
dGPU Jetson |
cudadec-memtype |
Memory type for CUDA decoder buffers. Represented internally by enum CudaDecMemType. 0 (memtype_device): Device 1 (memtype_pinned): Host Pinned 2 (memtype_unified): Unified |
Integer, 0, 1, or 2 |
cuda-memory-type=1 Default: 2 |
dGPU |
Encoder¶
The OSS Gst-nvvideo4linux2 plugin leverages the hardware accelerated encoding engine available on Jetson and dGPU platforms by interfacing with libv4l2 plugins on those platforms. The plugin accepts RAW data in I420 format. It uses the NVENC hardware engine to encode RAW input. Encoded output is in elementary bitstream supported format.
Inputs and Outputs¶
Inputs RAW input in I420 format
Control parameters
gpu-id (dGPU only)
profile
bitrate
control-rate
iframeinterval
Output
Gst Buffer with encoded output in H264 and H265 format.
Features¶
The following table summarizes the features of the Gst-nvvideo4linux2 encoder plugin.
Feature |
Description |
Release |
|---|---|---|
Supports H.264 encode |
— |
DS 4.0 |
Supports H.265 encode |
— |
DS 4.0 |
Gst Properties¶
The following table summarizes the Gst properties of the Gst-nvvideo4linux2 encoder plugin.
Property |
Meaning |
Type and Range |
Example/Notes |
Platforms |
|---|---|---|---|---|
gpu-id |
Device ID of GPU to used. |
Integer, 0 to 4,294,967,295 |
gpu-id=0 |
dGPU |
bitrate |
Sets bitrate for encoding, in bits/seconds. |
Integer, 0 to 4,294,967,295 |
Default:4000000 |
dGPU Jetson |
iframeinterval |
Encoding intra-frame occurrence frequency. |
Integer, 0 to 4,294,967,295 |
Default: 30 |
dGPU Jetson |
Profile |
H.264/H.265 encoder profile; represented internally by enum GstV4l2VideoEncProfileType. For H.264: 0 (GST_V4L2_H264_VIDENC_BASELINE_PROFILE): Baseline 2 (GST_V4L2_H264_VIDENC_MAIN_PROFILE): Main 4 (GST_V4L2_H264_VIDENC_HIGH_PROFILE): High For H.265: 0 (GST_V4L2_H265_VIDENC_MAIN_PROFILE): Main 1 (GST_V4L2_H265_VIDENC_MAIN10_PROFILE): Main10 |
Values of enum GstV4l2VideoEncProfileType |
Default Baseline Default: 0 |
dGPU Jetson |