avconv -re -i /tmp/test.mp4 -f flv rtmp://xxx.xxx.xx.xx/rediff/test

Failed to update header with correct duration.e=137.09 bitrate=1798.1kbits/s
[flv @ 0xc69b40] Failed to update header with correct filesize.

[flv @ 0x98a8e0] max_analyze_duration reached