[gst-devel] pixbuf from video file

[Fredrik Persson]

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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