[FFmpeg-user] try to change complex filters on runtime

[lucie Lemonnier]

I try to use your patch to change parameters of crop, it works fine except when the input file has reached its end because the function filter_frame in vf_crop.c is not called when the input file has reached its end.
I try to find where the AVFilterLink is destroy, I found some lines of code that make me think that the link is destroyed but when I try to modify these lines, it doesn't work.
Can you help me, please?
Thanks.

> Date: Fri, 12 Jul 2013 15:16:32 +0200
> From: stefasab at gmail.com
> To: ffmpeg-user at ffmpeg.org
> Subject: Re: [FFmpeg-user] try to change complex filters on runtime
> 
> On date Wednesday 2013-07-10 15:43:57 +0200, lucie Lemonnier wrote:
> [...]
> > For
> >  example , I call reinit_filters_complex("[0:0] crop=960:1080:0:0 
> > [tin];[2:0] crop=960:1080:0:0 [tmv]);[tin][tmv]overlay=0:0").
> > I 
> > passed in parameters of ffmpeg -i videoSource.mp4 -i transp.mov -i 
> > objets.png -filter_complex "[0:0] crop=960:1080:0:0 [tin];[1:0] 
> > crop=960:1080:0:0 [tmv]".
> > But It crash on this change.
> 
> > I think it's because I free all in filtergraphs.
> > But I don't know what is missing for it to work.
> > Can you help me, please?
> > Thanks.
> 
> You could achieve the same by extending libavfilter and using commands
> to send interactive commands to filters. For example check my patch on
> ffmpeg-devel to change crop parameters, as for what regards changing
> overlay you could connect two movie sources and disable/enable the
> active overlay (check timeline), or maybe implement a switcher
> controlled by a command. Dynamically changing movie input is not
> currently supported.
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