Setting a writeable flag for the appsink blocksize property

[George Demetriades]

Hi Tim, thanks for your quick response.

I'm not actually using the appsrc element; instead, I'm using a udpsrc
which is then decoded. The idea is to pull whole raw frames out of the
gstreamer pipeline via the appsink element which I then process myself. The
problem is that setting the blocksize element doesn't affect the size of
the buffer I receive in my callback function used when when the
"new-buffer" signal is emitted.

I'm not sure how to control the size of the buffer passed through to the
appsink though, and that is where the problem lies.

Thanks,
George


On 7 June 2013 11:25, Tim-Philipp Müller <t.i.m at zen.co.uk> wrote:

> On Fri, 2013-06-07 at 11:12 +0100, George Demetriades wrote:
>
> Hi,
>
> > I'm trying to control the size of the buffer passed to my program by
> > the appsink element, and someone on this mailing list helpfully
> > recommended that I look at the "blocksize" property. I've tried to
> > change it, but GST_BUFFER_SIZE still reports the same value as before,
> > and not the one set by my code.
> >
> >
> > Would anyone be able to tell me how to change the writeable flag for
> > the blocksize property? I haven't been able to find any documentation
> > on how to set individual flags, and I'm a bit stuck otherwise.
>
> The "blocksize" property is only a hint, for sources that have a choice.
>
> In the case of appsrc you will push buffers into the pipeline, and
> appsrc will push them in as you pass them to appsrc. The blocksize
> property will be ignored by appsrc.
>
> If you want to chunk things yourself before pushing them into appsrc you
> might find GstAdapter useful.
>
> Cheers
>  -Tim
>
>
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