fix thread quit

zhangmeng

2019-08-05 2d4b871401ace5a54eaff1cbfacd008c586ad928

 csrc/ffmpeg/format/FormatOut.cpp

@@ -364,6 +364,7 @@
    bool FormatOut::endWriter(){

        auto flag =  writeTrailer();
        closeResource();
        record_ = false;

        return flag;