[gst-devel] pixbuf from video file

[Luis de Bethencourt]

Fredrik,
I agree. Unfortunately this won't be done in time for my need for it,
so I will have to dive in and do it the hard way. But it would be nice
to make the path for future newbies easier. Thumbs are something most
video programs need and have in common

Luis de Bethencourt

On 8/2/07, Fredrik Persson <fredrik.p.persson at gmail.com> wrote:
> As a gstreamer newbie I started writing a small python/gstreamer app about a
> year ago. Fetching a snapshot out of a running videostream took me months. I
> almost abandoned gstreamer altogether because of this. This feat, currently,
> requires an unproportionally huge knowledge of gstreamer inner workings to
> accomplish.
>
> I also see this question appear from time to time on the mailing list.
> Therefore, in all humbleness, I suggest to the gstream core developers to
> incorporate into gstreamer a snapshot element that hides this mess from a
> regular programmer.
>
> Best regards,
>
> Fredrik Persson
>
> On 8/2/07, Luis de Bethencourt < bethencourt at gmail.com> wrote:
> > I'll give it a try this afternoon.
> >
> > Thanks a lot,
> > Luis de Bethencourt
> >
> > On 8/2/07, Tim Müller <t.i.m at zen.co.uk> wrote:
> > > On Tue, 2007-07-31 at 20:32 +0100, Luis de Bethencourt wrote:
> > >
> > > > ... I would need to get a pixbuf from the frame at the middle
> > > > of the video. First frame is not as representative because of
> > > > fade ins. How can I do this in gstreamer?
> > >
> > > You might want to have a look at totem's video-thumbnailer for
> > > inspiration. It's a bit clunky, but fairly straight-forward (basically
> > > it just uses playbin, sets it to PAUSED state, seeks, gets the last
> > > frame via playbin's "frame" property and shoves that into a conversion
> > > pipeline to get a GdkPixbuf).
> > >
> > > You can probably achieve the same thing with a pipeline like:
> > >
> > >  filesrc location=video.file ! decodebin ! ffmpegcolorspace !
> > > videoscale !
> > >
> video/x-raw-rgb,width=64,height=64,bpp=24,depth=24,red_mask=...
> !
> > > fakesink
> > >
> > > and then get a RGB24 buffer via fakesink's preroll-handoff signal (which
> > > is emitted in PAUSED state), which in turn is easily convertible into a
> > > GdkPixbuf or whatever you need.
> > >
> > > Cheers
> > >  -Tim
> > >
> > >
> > >
> > >
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> > --
> > Luis de Bethencourt Guimerá
> > luisbg
> > < bethencourt at gmail.com>
> > GPG: B0ED1326
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-- 
Luis de Bethencourt Guimerá
luisbg
<bethencourt at gmail.com>
GPG: B0ED1326