GST Pipleline Description for Decoding, Scaling, and trans-formating H264 Video.

[pmac_scw]

Hello,

I am having trouble using the vaapipostproc GStreamer plugin, and I could use help creating a pipeline description to solve my problem.

In this case the test file I am using is an H264 ES @720P and 20 FPS.

The following software only pipeline works well and uses about 24% of a CPU core:

"gst-launch-1.0 -vf filesrc location=./test.h264 ! h264parse ! avdec_h264 ! videoconvert ! video/x-raw,format=RGBA ! glimagesink"

This next pipeline works well and uses the vaapih264dec plugin for decoding. It consumes about 16% of a CPU core, and improvement of 33%, over the first pipleine:

"gst-launch-1.0 -vf filesrc location=./test.h264 ! h264parse ! vaapih264dec ! videoconvert ! video/x-raw,format=RGBA ! glimagesink"

I would like to use vaapipostproc instead of videoconvert, however the following pipeline does not work:

"gst-launch-1.0 -vf filesrc location=./test.h264 ! h264parse ! vaapih264dec ! vaapipostproc ! video/x-raw,format=RGBA ! glimagesink"

I have tried many variations of the pipeline using vaapipostproc, but none work.

Could you recommend a pipeline description for decoding, and trans-formatting using vaapi plugins? I need to output RGBA data to an appsink, and I am testing pipelines.

Here is the output from my vainfo:

libva info: VA-API version 1.8.0
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/iHD_drv_video.so
libva info: Found init function __vaDriverInit_1_8
libva info: va_openDriver() returns 0
vainfo: VA-API version: 1.8 (libva 2.8.0)
vainfo: Driver version: Intel iHD driver for Intel(R) Gen Graphics - 20.2.0 ()

I am using ubuntu 20.10:

CPU: Quad Core 11th Gen Intel Core i7-1165G7 (-MT MCP-)
speed/min/max: 1275/400/4700 MHz Kernel: 5.8.0-48-generic x86_64 Up: 21h 05m
Mem: 2591.5/15709.0 MiB (16.5%) Storage: 953.87 GiB (2.2% used) Procs: 270
Shell: Bash inxi: 3.1.07

Thank you,

Paul