I am trying to achieve a speed ~540fps in decoding HD h264 videos using nvidia gpu. The speed ~540 fps on HD is based on this presentation file page 10:
I tried many settings but the best I can get is 310 fps decoding speed. I am using a GeForce GTX 970 graphic card. I tried to decode a HD 30fps video. Here is the configurations I am using to get 310 fps decoding speed:
Disable the frame rendering when decoding. I did this by setting g_bUseDisplay = false in renderVideoFrame() method inside NvDecodeGL.cpp, near line 1540. If I don’t do that the decoding speed is less than 100fps.
In generating test h264 video using ffmpeg:
- I set resolution to be 1920x1080
- I don’t use b frame
- I use main profile
- I use fastdecode option
This is my ffmpeg transcoding command I used in generating the test HD video, taking a 4K video as the input video:
ffmpeg -i jellyfish-120-mbps-4k-uhd-h264.mkv -c:v libx264 -profile:v main -vf scale=1920:1080 -b:v 50000k -an -tune fastdecode -coder 0 -flags -loop -g 30 -bf 0 -t 10 jellyfish-hd-50mbps_main_nosound_fast_short.mp4
I wonder is there a special sample video I can use, or is there a particular setting I need to use in writing the decoder code so that I can get the 540 fps decoding speed?
Thank you very much!