[gst-devel] pixbuf from video file

[Fredrik Persson]

To make it absolutely clear; I think that the gstreamer developers are doing
a great job!

I also absolutely think that they also appreciate "user input" (in this
case, mine and Luis') on what features we'd like to see in gstreamer.
Therefore, I like to take the opportunity to bring up this suggestion again.
I think that every time this question is brought up here on the mailinglist
is strengthens the point that a "snapshot element" in gstreamer is a good
idea and that it would increase the attractiveness of the entire gstreamer
framework.

/Fredrik Persson

On 8/2/07, Luis de Bethencourt <bethencourt at gmail.com> wrote:
>
> 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
>
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