Grabbing frames from GStreamer pipeline

[Kiran Kumar]

Hi,

Are you setting the size in your code?

On Tue, Jun 14, 2016 at 10:46 PM, Thornton, Keith <keith.thornton at zeiss.com>
wrote:

> Hi,
>
> I don’t know what you are doing but when I call gst_buffer_map for my Full
> HD frames, I get info.size=8294400 and one single block of memory which I
> can copy in a single operation.
>
>
>
> *Von:* gstreamer-devel [mailto:
> gstreamer-devel-bounces at lists.freedesktop.org] *Im Auftrag von *Kiran
> Kumar
> *Gesendet:* Mittwoch, 15. Juni 2016 00:27
> *An:* Discussion of the development of and with GStreamer
> *Betreff:* Re: Grabbing frames from GStreamer pipeline
>
>
>
> I also used gst_base_sink_set_blocksize() to set the blocksize when the
> sink is in pull mode. Nothing changed.
>
>
>
> Thanks,
>
> Kiran
>
>
>
> On Mon, Jun 13, 2016 at 10:51 PM, Thornton, Keith <
> keith.thornton at zeiss.com> wrote:
>
> Hi,
>
> I think you are mistaken when you say “The gst_app_sink_pull_sample(),
> gst_sample_get_buffer() and gst_buffer_map() hands out only streams which
> are of size 4096 bytes each”. I am using these APIs to pass full 1920 *
> 1080 frames. You should provide more details so that we can maybe see what
> is going wrong.
>
>
>
>
>
>
>
> *Von:* gstreamer-devel [mailto:
> gstreamer-devel-bounces at lists.freedesktop.org] *Im Auftrag von *Kiran
> Kumar
> *Gesendet:* Montag, 13. Juni 2016 21:20
> *An:* gstreamer-devel at lists.freedesktop.org
> *Betreff:* Grabbing frames from GStreamer pipeline
>
>
>
> Hi,
>
>
>
> I am new to this forum.
>
> I am trying to pull frames from gstreamer pipeline and feed it to user
> application. I am using appsink pad to pull out the frames while the
> pipeline is in the PLAYING state.
>
> Problem:
> 1. The gst_app_sink_pull_sample(), gst_sample_get_buffer() and
> gst_buffer_map() hands out only streams which are of size 4096 bytes each.
> I tried changing the blocksize but, there is no effect.
>
> My goal:
> To extract or pull a single frame into a single buffer and feed this
> buffer as input to my application which does some image processing (I am
> not using OpenCV).
>
> I want to pull every frame from the video-source, populate the buffer
> (each frame is associated with a particular buffer) and finally feed the
> buffer to my application. I don't want to dump this frame into a file in my
> filesystem.
>
> Questions:
> 1. Are there any other ways in which I can achieve my goal without using
> appsink?
> 2. If using appsink is the only way I can pull data from gstreamer, how
> can I achieve my goal using appsink?
>
>
>
> I appreciate any guidance.
>
> Thanks in advance.
> Kiran
>
>
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