Get error when using type h264

[snaillp]

i publish images to a rostopic using type Image，and expect to get a video stream from web_video_server. The video cannot play at the url http://localhost:8080/stream?topic={ROS_TOPIC}&type=h264 , and i get error like "[mp4 @ 0x7f2a4c1813a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 1 >= 1".
if thre url turn to http://localhost:8080/stream?topic={ROS_TOPIC}, it can play, but actully became to an image stream.
what should i do to get a video stream instead of an image stream?