it can sort of be done, but not practical or easy to accomplish at all..

youd be better off using something like OBS, which makes the things you want to 
do very easy.

OBS already uses or can use ffmpeg behind the scenes anyways =]

cheers =]


> On Apr 18, 2018, at 10:16 55PM, Nam Giang <k...@ece.ubc.ca> wrote:
> 
> Hi there,
> 
> I'm using ffmpeg to live stream to Youtube. I'm wondering if I can do
> dynamic overlay.
> 
> For example, when my stream is live and the world is watching, at some
> points I want to pop up some pictures or add some sound effects to my live
> stream.
> 
> I wonder if there is any command that I can use to add those things into my
> live stream?
> 
> Thanks
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