id	summary	reporter	owner	description	type	status	priority	component	version	resolution	keywords	cc	blockedby	blocking	reproduced	analyzed
1639	concat filter frozen	chinshou		"The concat filter cause ffmpeg frozen.

prepare any mp4 video , rename it to 1.mp4. then copy it to 2.mp4.

finally execute following command to join the two videos

ffmpeg -f lavfi -i ""movie=1.mp4, scale=512:288 [v1] ; amovie=1.mp4 [a1] ;movie=2.mp4, scale=512:288 [v2] ; amovie=2.mp4 [a2] ;[v1] [v2] concat [out0] ; [a1] [a2] concat=v=0:a=1 [out1]"" join.avi

ffmpeg begin to encoding successfully , but frozen at 50% .

I used the ffmpeg 20120810 windows build from 
http://ffmpeg.zeranoe.com/builds/win32/static/ffmpeg-20120810-git-633b90c-win32-static.7z

I investigate the code and found the frozen caused by av_read_frame , the call will be blocked at 50% position.
"	defect	closed	normal	avfilter	git-master	fixed	movie				1	1