VideoWriter to rtmp by gstreamer

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Hei,

I have to send opencv Mat frames to youtube channel. So i'm using rtmpsink that can accept only flv format (because there is no other alternative). I am thinking about the same scenario as creating simple .flv file by specifying CV_FOURCC('F','L','V','1') or something like that. Instead of saving to file, i will try to send on server. Can anyone comment this ?

Is there anyone that already tested this scenario ?

Thanks!