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OMX encoder dont work in low bitrate
ahkovitz
Join Date: 29 Jan 23
Posts: 1
Posted: Tue, 2023-02-21 05:04
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HI,

I have recently started exploring the video interface that provided by qualcomm SDK for Gstreamer. Unfortunately, some issues arose when working with the provided OMX encoder.

I invoked some pipeline that use omxh264enc plugin, For video that set at resolution 480P,I noticed that omxh264enc can work only with high bit-rate (5Mbit/sec), When i used lower bitrate as 2Mbit/sec, the video was grainy. 

pipeline: qtiqmmfsrc camera=1 device=hires latency=0 ! video/x-raw(memory:GBM),width=640,height=480,format=NV12,framerate=30/1 ! omxh264enc target-bitrate=2000000 control-rate=2 ! video/x-h264,profile=main !  h264parse ! rtph264pay name=pay0 pt=96

video: https://www.youtube.com/watch?v=o8xhjkZtAcU

* when tuning the profile parameter to high, the video was corrupted. Also i couldn't set the level param of the encoder.

At other effort  i used  the qtiqmmfsrc plugin with lower bitrate (1.2Mb/sec)  then i used in omxh264enc. I recevied clear stream as follow by this video 

pipeline: qtiqmmfsrc camera=1 device=hires video_0::bitrate=1200000 ! video/x-h264,width=640,height=480,format=NV12,framerate=30/1 ! h264parse ! rtph264pay name=pay0 pt=96

video: https://youtu.be/0SBMoc8VSB8

My question is how can i make the omxh264enc work with low bit rate ?

Thank you,
Amit.

 

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