ffmpeg has memory leak

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Visual-Studio

MFC

ffmpeg

VS2012

I got some question, in my code,
this project will get video stream from camera,
and encoder with ffmpeg lib and x264,
then both save in a .mp4 file, upload to rtmp server.

now, when I stop get stream and encode,
VS2012 show the memory leak, but it cant locate the memory leak code.

can someone help me?
Or tell me, it's ffmpeg lib issue or my code issue.
thanks!

It's my Code: http://ideone.com/NJwjfW

OnStartThred() Funtion is the master function,
I use _CrtDumpMemoryLeaks() to find memory leak.

One of the memory leak, its at "avformat_close_input(&pFormatCtx);"
even I set pFormatCtx = NULL, also has memory leak,
I try fix it, but I cant....

note: memory leak is like

{710} normal block at 0x004D5B30, 29 bytes long.
 Data: <  c             > 18 B9 63 01 0C 00 00 00 0C 00 00 00 01 00 00 00
{697} normal block at 0x0048F7D0, 58 bytes long.
 Data: <  c )   )       > 18 B9 63 01 29 00 00 00 29 00 00 00 01 00 00 00
{694} client block at 0x004C2728, subtype c0, 204 bytes long.
a CObject object at $004C2728, 204 bytes long
{687} normal block at 0x0048F758, 53 bytes long.
 Data: <  c $   $       > 18 B9 63 01 24 00 00 00 24 00 00 00 01 00 00 00
Object dump complete.