ffmpeg update to june 23 version which fixes mp4 crash on still frames with 3...

source/patched-ffmpeg-mt/mt-work/todo.txt

Index: source/patched-ffmpeg-mt/mt-work/todo.txt
===================================================================
--- source/patched-ffmpeg-mt/mt-work/todo.txt	(revision 50820)
+++ source/patched-ffmpeg-mt/mt-work/todo.txt	(working copy)
@@ -34,8 +34,12 @@
 - ffmpeg with -vsync != 0 breaks A/V sync because
 it can't handle more than 1 frame of decoder delay.
 This can be seen with H.264 on mainline.
-- Error resilience has to run before ff_report_
-frame_progress() is called.
+- Decoding single-frame files with 3+ threads never
+outputs anything in ffmpeg. It should stop the initial
+delay and just return a frame immediately if one of the
+first N frames is an EOF packet.
+- Error resilience has to run before ff_report_frame_progress()
+is called.
 - 'make test' must pass. This means pthread emulation
 must work the same way without --enable-pthreads.
 There also seems to be some problem related to