[FFmpeg-devel] Overlay Text at Specific Times

Joshua Grauman jnfo-c at grauman.com
Tue Jun 14 18:32:56 CEST 2011

Thanks, these sound like the right direction. Just to be completely 
explicit, am I correct that these are not currently implemented and 
require coding? I'm possibly willing to code it, supply a patch, etc., 
especially if someone would be willing to help walk me through it a bit. 
I think I'd go for adding time parameters to the overlay filter, as this 
might add more flexibility for things other than text. Thoughts on how 
hard this would be?


>> Hello again,
>> Now that I have the rotation working, I'm trying to add text to my
>> video. I'd like to be able to overlay text at specific times in my
>> video (bottom center). I'd be perfectly fine being able to overlay
>> images at specific times as well as I could create those from the
>> text. I've searched for this a lot but I can't find anything. Is
>> this possible? Can anyone point me in the right direction? Thanks!
> You can make the drawtext filter parametric (allowing to specify the
> size of the image, the size of the text, and the time so you can have
> the text moving on the screen). Similarly you could extend the overlay
> filter for taking in input a time parameter. Patches are welcome.

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