id	summary	reporter	owner	description	type	status	priority	component	version	resolution	keywords	cc	blockedby	blocking	reproduced	analyzed
977	stream copy duration does not match the one specified by -t when -ss is used	overclokkato		"Hello,
i'm trying to cut an Adobe postprocessed F4v video (h.264 + mp3) with this command :

ffmpeg -ss 00:10:00 -t 10 -i c:\video.f4v -vcodec copy -acodec copy -f flv -async 1 videoout.f4v

but the output file duration is inaccurate;in my case 12 second and not 10 second .
If i try to insert an odd number in -ss (for example -ss 00:10:00) i have this issue while an even number the duration is correct.
Can you help me to resolve this issue ?
Is the command above right?
I tried to download last ffmpeg version and compile one version too but with the same results,
Thanks a lot in advance
Best regards"	defect	open	normal	FFmpeg	git-master						1	0