[FFmpeg-user] lbavfilter. watermark. time interval.
demimurych at mail.ru
Mon Dec 12 15:29:40 CET 2011
В сообщении от Понедельник, 12-дек-2011 16:15:41 автор demimurych написал:
> В сообщении от Понедельник, 12-дек-2011 15:32:30 автор Mark Himsley написал:
> > 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
> Hello again,
> thank you for the example and explanation, it's really working if i put
> another video fragment over my clip and fade it as you meant. The problem
> is, when I try to place a watermark in the same way, the displayed result
> is a black rectangle instead of the watermark.
> I tried it several times using a direct copy-paste of your code with
> fade:0:0 and fade:0:1 etc, unfortunately still without success. Maybe this
> behavior is already known and you could tell me what I'm doing wrong?
> Thanks in advance,
I forgot to mention an important detail: while you probably supposed that I
want to use a video sequence as watermark, my watermark is a static PNG image.
I really hope it can work this way.
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