Gstreamer save frame to multifilesink produces 0 KB image

[Dwight Kulkarni]

Hi all,

It seems that multifile sink pipeline below did work the second time. The
first time for some reason the frames were blank, possibly I was too hasty
in terminating the program ?

I have a followup question.  Is there a way for me to retrieve the result
into memory rather than in a filesink. I am calling gstreamer in a C++
program. Can I have Gstreamer return a handle for each frame so that I can
directly access the JPEG rather than having to write it to file ?

Thanks in advance.

On Thu, Aug 26, 2021 at 12:25 PM Nicolas Dufresne <nicolas at ndufresne.ca>
wrote:

> Le jeudi 26 août 2021 à 11:14 -0400, Dwight Kulkarni via gstreamer-devel a
> écrit :
> > Hi all,
> >
> > I am using gstreamer and try the following two pipelines:
> >
> > gst-launch-1.0 v4l2src device=/dev/video1 ! video/x-raw, width=1920,
> > height=1080, framerate=15/1 ! autovideosink
> >
> > When I run this command, a window opens up and shows me the camera
> output.
> >
> > Now I want to convert this stream to jpeg and save it to file, so I use
> the
> > following:
> >
> > gst-launch-1.0 v4l2src device=/dev/video1 ! video/x-raw, width=1920,
> > height=1080, framerate=15/1 ! jpegenc ! multifilesink
> > location=/home/myuser/mytestfolder/img_%06d.jpg
> >
> >
> > I run the second command for a few seconds then terminate with Ctrl C. I
> see
> > files img_00001.jpg etc. but the size of the file is 0 KB.
> >
> > Can anyone suggest what I might be doing wrong ?
> >
>
> This is strange, I ran this here, gst 1.18.4, and it just worked. Perhaps
> you
> should set GST_DEBUG=2 to get warnings printed if any, might help ? Also,
> consider adding videoconvert, in case your cam does not produce a pixel
> format
> compatible with jpegenc ?
>
>

-- 
Sincerely,

Dwight Kulkarni
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