Zynq Ult VCU TRD User Guide
43
UG1250 (v2019.1) May 29, 2019
Chapter 3:
APU Software Platform
describes the plug-ins used in the GStreamer interface library.
Table 3-7:
GStreamer Plug-ins
Plug-in
Description
v4l2src
v4l2src can be used to capture video from V4L2 devices like Xilinx HDMI-RX and TPG.
Example pipeline:
gst-launch-1.0 v4l2src ! kmssink
This pipeline shows the video captured from a
/dev/video0
and rendered on a display
unit.
kmssink
The kmssink is a simple video sink that renders raw video frames directly in a plane of a
DRM device.
Example pipeline:
gst-launch-1.0 v4l2src ! “video/x-raw, format=NV12, width=3840,
height=2160” ! kmssink
omxh26xdec Decoder omxh26xdec is a hardware-accelerated video decoder that decodes encoded
video frames.
Example pipeline:
gst-launch-1.0 filesrc location=/media/card/abc.mp4 ! qtdemux !
h26xparse ! omxh26xdec ! kmssink
This pipeline shows an
.mp4
multiplexed file where the encoded format is h26x encoded
video.
Note:
Use omxh264dec for H264 decoding and omxh265dec for H265 decoding.
omxh26xenc Encoder omxh26xenc is a hardware-accelerated video encoder that encodes raw video
frames.
Example pipeline:
gst-launch-1.0 v4l2src ! omxh26xenc ! filesink location=out.h26x
This pipeline shows the video captured from a V4L2 device that delivers raw data. The
data is encoded to the h26x encoded video type and stored to a file.
Note:
Use omxh264enc for H264 encoding and omxh265enc for H265 encoding.
alsasrc
The alsasrc plug-in can be used to capture audio from audio devices like Xilinx HDMI-RX.
Example pipeline:
gst-launch-1.0 alsasrc device=hw:1,1 ! queue ! audioconvert !
audioresample ! audio/x-raw, rate=48000, channels=2, format=S24_32LE !
alsasink device="hw:1,0"
This pipeline shows the audio captured from an ALSA source and plays on an ALSA sink.
alsasink
The alsasink is a simple audio sink that plays raw audio frames.
Example pipeline:
gst-launch-1.0 alsasrc device=hw:1,1 ! queue ! audioconvert !
audioresample ! audio/x-raw, rate=48000, channels=2, format=S24_32LE !
alsasink device="hw:1,0"
This pipeline shows the audio captured from the ALSA source and plays on an ALSA sink.
