id	summary	reporter	owner	description	type	status	priority	component	version	resolution	keywords	cc	blockedby	blocking	reproduced	analyzed
1876	vc1dec.c multi-threading decode crash issue	DonMoir		"In vc1_decode_frame there is:

if (ff_msmpeg4_decode_init(avctx) < 0 ||
  ff_vc1_decode_init_alloc_tables(v) < 0)

If this entire statement is not locked down in a multi-threaded multi-video environment, then crash and burn.

No way I know of to reproduce crash using ffmpeg command line tools.

The way I produce crash is to pump more than one WMV3 files at ffmpeg simultaneously. Multiple instances of a file are using for playback, thumbnails, and other things. Then when calling avcodec_decode_video2 you will get spurious crashes depending on the current state of things.

All other file formats I have tested seem to be ok. Just any format that makes use of vc1_decode_frame is suspect.

The file I used for testing is located here: (283 MB)

http://sms.pangolin.com/temp/WMV3_vc1_decode_frame_crash.wmv
"	defect	closed	important	avcodec	unspecified	invalid	vc1 crash	onemda@…			1	1