AW: Grabbing frames from GStreamer pipeline

[Thornton, Keith]

I am not setting the size in my SampleCallback function but I am setting the size (and type of memory i.e.contiguous) where I provide the buffers to my grabber card.

Von: gstreamer-devel [mailto:gstreamer-devel-bounces at lists.freedesktop.org] Im Auftrag von Kiran Kumar
Gesendet: Mittwoch, 15. Juni 2016 07:49
An: Discussion of the development of and with GStreamer
Betreff: Re: Grabbing frames from GStreamer pipeline

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<mailto: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<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<mailto: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<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<mailto: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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