Importance of metadata in RTMP streaming

I came across an article saying RTMP Pushing the stream , If you don’t send flv metadata, It can also be displayed normally , Because… Is used for the display at the receiving end H264 in SPS、PPS In the parameters of the .

So I did an experiment and didn’t send metadata, Send only SPS/PPS package 、 Video frame （I Frame and normal frame ）, use VLC Pull flow can indeed be displayed normally .

What’s the actual situation RTMP In the use , This metadata Is it important? ？ Or it depends on whether the pull end is used metadata To decide