[FFmpeg-user] overlay not connected to source error - drawtext

[Damon Edwards]

using the subtitling worked perfect, thanks!

On Sat, Apr 28, 2012 at 1:19 AM, Clément Bœsch <ubitux at gmail.com> wrote:

> On Sat, Apr 28, 2012 at 09:52:39AM +0200, Nicolas George wrote:
> > Le nonidi 9 floréal, an CCXX, Damon Edwards a écrit :
> > > [root at localhost test]# ffmpeg -i table.mp4 -vf
> > >
> "drawtext=textfile=txtoverlay:fontfile=/usr/share/fonts/default/ghostscript/bchb.pfa:x=(w-text_w)/2:y=(h-text_h-line_h)/2:fontsize=21:fontcolor=white:shadowy=2,fade=in:0:10:alpha=1,fade=out:30:10:alpha=1
> > > [over]; [in][over] overlay [out]"
> >
> > drawtext is a filter: it reads frames, writes the text on top of them and
> > sends them to the next filter. As such, you did not provide an input, so
> it
> > takes the current one, which is the filtergraph input, which is
> therefore no
> > longer available for overlay.
> >
> > > -r 29
> >
> > That is a very strange choice.
> >
> > > However, something like this works
> > > ffmpeg -i table.mp4 -vf
> > > "color=red at 0.2:270x50,fade=in:0:10:alpha=1,fade=out:30:10:alpha=1
> > > [over]; [in][over] overlay [out]" -r 29 -vcodec libx264 -acodec
> libfaac -ab
> > > "96k" -ac 2 -y overlaid.mp4
> >
> > Yes: drawtext is writing its text on the red image. Unfortunately, there
> is
> > currently no way to get drawtext to write on a transparent image and
> produce
> > non-transparent text. The best you can do is probably to duplicate your
> > input (using split) to use it as input for drawtext.
> >
>
> Or maybe a simpler way would be to make use of the ASS markup (-vf
> ass=...)? When it comes to text effects I believe it's the most
> appropriate solution.
>
> Youtube + "aegisub karaoke effects" or "aegisub fade" should give an
> overview. Also, http://docs.aegisub.org/manual/ASS_Tags and #aegisub at rizon
> on IRC.
>
> Then, you can use http://ffmpeg.org/libavfilter.html#ass to do the
> overlay.
>
> [...]
>
> --
> Clément B.
>
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>


-- 
Damon Edwards
gplus.to/damonedwards