Move _STREAM_BOUNDARY before _STREAM_PART #3720
                
     Merged
            
            
          
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The boundary delimiter (_STREAM_BOUNDARY) needs to be send before the body part (_STREAM_PART) too follow RFC2046. This caused
ffplay/ffmpegto fail to open the MJPEG stream.RFC2046: 5.1. Multipart Media Type
"... The body must then contain one or more body parts, each preceded by a boundary delimiter line, and the last one followed by a closing boundary delimiter line. ..."
After the change
ffplay,ffmpegandmplayerworked fine with the MJPEG stream.