Decoding two H264s at the same time will cause the decoding time to increase？

Gaming and Visualization Technologies Visualization Video Processing & Optical Flow
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1

When two videos are hard decoded and played at the same time, the decoding time increases. One video decoding time is usually 0ms~3ms; However, if you pull up two processes to decode the video at the same time, it will take 100ms to 200ms to decode

RTX 2070
WIN 11
nvidia-smi 512.52,driver version 512.52 cuda version 11.6

2

You mean like when Chrome has two videos HW decoded?

3

I modified the demo（Video_Codec_SDK\Samples\AppDecode\AppDecD3D）, support rtsp video input, rtsp fixed resolution 1920x1080;
Start two programs to play two videos simultaneously
AppDecD3D.exe rtsp://192.168.0.88:8554/test1
AppDecD3D.exe rtsp://192.168.0.88:8555/test2

When only one video is played, the video is smooth, and the decoding time（dec.Decode()) is generally 0ms~4ms;

If the two videos are opened at the same time, the decoding time and printing will be more than 170ms from time to time, resulting in the video display stutter

4

Hi happy886, it would help tremendously if you could share your code modifications so we could check what might be going wrong.

Also, being a sample app, I am not sure the sample is coded with concurrent runs in mind, so it might miss necessary optimizations in the first place.