[Bug 759470] input-selector: add mode that waits for keyframe before switching inputs

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=759470

--- Comment #19 from Tapas Kumar Kundu <tapascst at gmail.com> ---
(In reply to Tapas Kumar Kundu from comment #18)
> (In reply to Tapas Kumar Kundu from comment #17)
> > Here the debug log from input-selector element:
> > https://drive.google.com/file/d/0B1cSMS8_GuAEeVM5MV9FOVlSZzA/view?usp=sharing
> > 
> > You can search for "startcam" to see exact line where camera switch happens
> > from application side. This is generated with proposed patch on git master.
> > 
> > I really need some help to understand where the delay is occurring inside
> > input-selector element during cam switch. 
> > 
> > Could you please take a look at this log ?
> 
> It seems that something is causing delay because of sticky events . This is
> just a guess by looking into time stamps of log during cam switch. 
> 
> Can anyone explain it to me if this can cause delay or not ? 
> 
> 

I modified gstinputselector.c not to pass any sticky events when camera switch
happens but i still same delay during camera switch. 

However, if I use proposed patch from comment #15 with sync-mode=0 then i can
see zero delay camera switch but my pipeline every 10-15 times camera switch.
Any ideas on this ? Why sync-mode=0 is not working with input-selector element
with my patch ? Any help is appreciated.

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