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fix(rtmp2rtc): fix video payload type for rtmp to rtc bridge (ossrs#3041)
#3041
当 rtc 推流后,rtc source对应的video payload type会因sdp协商结果发生变化;
此后如果发生rtmp to rtc或者srt to rtc时,bridge构造rtp packet的video payload type为默认值 102,这与此前存在不匹配的情况,从而导致webrtc拉流端不能正确获取video track
修正办法:把bridge构造rtp packet的video payload type的值设置为rtc source对应的video payload type