add rec notify, try catch

zhangmeng

2019-08-07 4eab3ca9bf020df2bb53fa2a36aa4f57d684225c

 csrc/ffmpeg/format/FormatOut.cpp

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

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

        return flag;