[FFmpeg-devel] [PATCH] ffplay: fix a crash caused by aborting the video queue

avcoder ffmpeg at gmail.com
Sat Aug 27 13:44:30 CEST 2011

On Sat, Aug 27, 2011 at 6:09 PM, Marton Balint <cus at passwd.hu> wrote:
> Yes, the patch description is probably not entirely correct, sorry, my
> mistake. The thought of changing w_index somehow remained in my mind from
> the time I debugged this.
> The main problem with the code is that multiple ALLOC events may occur at
> the same time if we don't pop them from the event queue on abort. If these
> alloc events tries to allocate the same vp, vp->bmp changes (free-d, and the
> then allocated again), I typically got the crash when
> SDL_LockYUVOverlay(vp->bmp) was called from the video thread, after
> SDL_FreeYUVOverlay(vp->bmp) was called from the main thread.

Why do you get multiple ALLOC envents?

I checked the ALLOC events, FF_ALLOC_EVENT is only pushed in
"queue_picture()" which is called by "video_thread()", it is
impossible to have MULTIPLE FF_ALLOC_EVENT.

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