Every video frame is sent as a keyframe

[mmdGhanbari]

Hi. First of all, thanks for your awesome work!

I'm developing a streaming application where native clients stream a vp9 video file to a media server using WebRTC, and there's also a web client where I can consume and view the incoming video track. The video file is in IVF format (vp9) and I can confirm with ffprobe that there's a keyframe every 4 seconds.

I read the IVF video file and stream it using the play_from_disk_vpx example code (IVFReader). But in the web client, when I investigate the webrtc-internals stats, I can see that the number of decoded frames and decoded keyframes are equal. So, somehow every video frame is sent as a keyframe.

I wonder if there's something that I'm missing? Should I do something manually to mark specific RTP packets as keyframes?
Thanks in advance.

[mmdGhanbari]

I should add that when I encode the IVF file as VP8, everything is fine and the number of decoded keyframes is as expected. So, the problem only exists when I'm streaming a VP9 video file.