[FFmpeg-user] lbavfilter. watermark. time interval.

[Mark Himsley]

On 11/12/11 22:15, demimurych wrote:
> В сообщении от Суббота, 10-дек-2011 21:42:42 автор Mark Himsley написал:>  On 09/12/2011 23:18, Clément Bœsch wrote:>  >  On Fri, Dec 09, 2011 at 11:48:05PM +0200, demimurych wrote:>  >>  Hello.>  >>  >  >>  I'm currently working with libavfilter and have a question relating>  >>  watermarks.>  >>  >  >>  What I already know is how to put a watermark on a whole video clip.>  >>  ffmpeg  -i inputfile   -vf "movie=650_360_net.png [logo]; [in][logo]>  >>  overlay=W- w-20:H-h-20 [out]"  outpufile>  >>  >  >>  What I'm trying to achieve is to place a watermark that would only be>  >>  visible from some certain point and to some point - for example, only>  >>  the first 10 seconds of the video clip.>  >>  >  >>  If there's a workaround that can make it possible please let me know.>  >>  I'm stuck on this issue right now so I would be glad to receive an>  >>  answer.>  >>  >  >>  Thanks in advance.>  >  >  >  Maybe you could generate a 10 second
s video with your source image, and>  >  use it as overlay?
>
> Hello again,thank you very much for a fast answer. Using of fade effect is a smart solution indeed. However it's still not really obvious for me, how can I fade just the watermark and not the whole frame. I would appreciate if you could explain the workaround further and tell more details.Thanks in advance,Max

Hum, don't know what's happening with line wrapping... Probably my mail 
server doing something wrong with base64 to 8bit conversion.

Generically (assuming your logo has an alpha):

ffmpeg -i background.movie -vf 
"movie=watermark.movie,fade=in:25:25:alpha=1,fade=out:300:25:alpha=1[logo];[in][logo] 
overlay=0:0 [out]" <encoding options> output.movie


-- 
Mark