ffmpeg inject video only can play first frame

I’m trying to inject a video into mediasoup. I’m following this demo

mp4 file : mediasoup-demo/video-audio-stereo.mp4 at v3 · versatica/mediasoup-demo · GitHub

Command : ( trying to send video only )

ffmpeg -re -v info -stream_loop -1 -i video-audio-stereo.mp4 -map 0:a:0 -acodec libopus -ab 128k -ac 2 -ar 48000 -map 0:v:0 -pix_fmt yuv420p -c:v libvpx -b:v 1000k -deadline realtime -cpu-used -5 -f tee "[select=v:f=rtp:ssrc=2222:payload_type=102]rtp://ip:42819?rtcpport=44932"

Result : on the web page only show the first frame of video, the video’s clock is not running

ffmpeg command seem fine, no error message, still sending video. The mediasoup log seem normal, too.

If I send audio only, it works fine.

Checked in chrome webrtc debug,

The framesReceived/s looks weird

Found the answer here H264 WebRTC video streamed from ffmpeg through Janus is very choppy on playback - Stack Overflow