Video Decoding Support for the Dragonwing EVK Board

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Qualcomm Dragonwing Technical Guide

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Qualcomm Dragonwing Technical Guide

Table of Contents [Sticky]

• Introduction
  • What is the Qualcomm Dragonwing IQ9?
  • Why the Qualcomm Dragonwing IQ9?
  • RidgeRun Services
  • RidgeRun Products
• Carrier Boards
  • IQ-9075 EVK
• EVK Board Bring Up
  • Yocto Build
    • Setup Environment
    • Building an Image - Qualcomm Linux 2.0
    • Building an Image - Qualcomm Linux 1.8
    • Flashing an Image
    • Getting into the Board
  • Ubuntu
    • Features Available
    • Setup Environment
    • Flashing Ubuntu
    • Getting into the Board
• GStreamer
  • Enable GStreamer Support
  • Example Pipelines
  • Performance
    • Element Latency
• Multimedia Support
  • Video
    • Video Capture
    • Video Encoding
    • Video Decoding
    • Video Transformation
  • Streaming
    • Streaming over UDP
    • Streaming over RTSP
    • Streaming over MoQ
  • Hardware Acceleration
    • GPU Enabling and Usage
    • ISP Enabling and Usage
    • VPU Enabling and Usage
    • NPU Enabling and Usage
• Security Features
  • Secure Boot
  • Disk Encryption
  • TEE
  • OTA
• Contact Us

IQ-9075 can decode H.264 and H.265 with software-based and hardware-accelerated elements. Use v4l2h264dec and v4l2h265dec for hardware-accelerated video decoding. Using the hardware-accelerated codecs can free in average between 2% and 7% of the CPU load, depending on the video resolution.

Problems running the pipelines shown on this page? Please see our GStreamer Debugging guide for help.

Info

The following tests were done with an IMX577 camera connected to the Dragonwing IQ-9075 EVK

Video Decoding

These elements are supported for the Ubuntu Image (Ubuntu 24.04.04) and files with a 1080p resolution generated in the last section were used to test average performance and element latency.

CPU Decoders

These are the supported CPU Decoders for the Dragonwing EVK Board:

• avdec_h264
  • Example pipeline for the avdec_h264 element:

gst-launch-1.0 -v filesrc location=avdec_h264-test.mp4 ! qtdemux ! h264parse ! avdec_h264 ! waylandsink

• Performance measurements for the avdec_h264 element:

Resolution	%MEM	RSS (KB)	GPU Utilization (%)	FPS	Mean FPS	CPU Usage (%)
1280x720	0.2	86240	0.88	29.990	30.092	6
1920x1080	0.3	118548	1.70	30.005	30.098	6
3840x2160	0.9	328588	1.69	29.988	30.057	11

• avdec_h265:
  • Example pipeline for the avdec_h265 element:

gst-launch-1.0 -v filesrc location=avdec_h265-test-test.mp4 ! qtdemux ! h265parse ! avdec_h265 ! waylandsink

• Performance measurements for the avdec_h264 element:

Resolution	%MEM	RSS (KB)	GPU Utilization (%)	FPS	Mean FPS	CPU Usage (%)
1280x720	0.2	96436	0.59	15.942	18.275	7
1920x1080	0.3	133392	0.00	10.307	12.072	8
3840x2160	1.0	372048	0.00	2.903	4.309	2

• avdec_mpeg4
• avdec_mpeg2video
• avdec_vp8
• avdec_vp9

VPU Decoders

These are the supported Hardware Accelerated Decoders for the Dragonwing EVK Board.

• v4l2h264dec
  • Example pipeline for the v4l2h264dec element:

 gst-launch-1.0 -e -v filesrc location=v4l2h264dec.mp4 ! qtdemux ! h264parse ! v4l2h264dec ! waylandsink

• Performance measurement forthe v4l2h264dec element:

Resolution	%MEM	RSS (KB)	GPU Utilization (%)	FPS	Mean FPS	CPU Usage (%)
1280x720	0.1	41484	0.76	30.000	30.102	4
1920x1080	0.1	41580	1.44	29.987	30.102	5
3840x2160	0.1	42116	1.44	30.011	30.096	4

• v4l2h265dec
  • Example pipeline for the v4l2h265dec element:

gst-launch-1.0 -e -v filesrc location=v4l2h265dec.mp4 ! qtdemux ! h265parse ! v4l2h265dec ! waylandsink

• Performance measurements for the v4l2h265dec element:

Resolution	%MEM	RSS (KB)	GPU Utilization (%)	FPS	Mean FPS	CPU Usage (%)
1280x720	0.1	48576	1.55	30.000	30.103	4
1920x1080	0.1	48696	1.45	29.996	30.101	4
3840x2160	0.1	49168	1.45	30.003	30.100	4

FAQ

Why use an explicit hardware decoder instead of decodebin?

decodebin can select a software decoder. Explicit pipeline definition is best for ensuring hardware-accelerated decoding.

Can IQ-9075 decode H.265 4K@30 fps video?

Yes, when using the v4l2h265dec hardware-accelerated element. The software-based avdec_h265 element decodes 4K video but can't keep up with the 30 fps, providing a mean framerate of 4.3 fps in our results.

Related pages

• Qualcomm Dragonwing Technical Guide/Multimedia Support/Video/Encoding
• Qualcomm Dragonwing Technical Guide/Multimedia Support/Video/Video
• Qualcomm Dragonwing Technical Guide/Multimedia Support/Acceleration/VPU Enabling and Usage
• Qualcomm Dragonwing Technical Guide/GStreamer/Performance

Qualcomm Dragonwing Technical Guide

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