Bitmap to JPEG encoder

[Nicolas Dufresne]

Le lundi 28 mai 2018 à 18:42 +0200, Wolfgang Grandegger a écrit :
> Hello,
> 
> Am 28.05.2018 um 18:03 schrieb Nicolas Dufresne:
> > Le lundi 28 mai 2018 à 17:24 +0200, Wolfgang Grandegger a écrit :
> > > Hello,
> > > 
> > > I'm rather new to GSTreamer. I want to JPEG encode an RGB video
> > > stream
> > > and send it to the network e.g. with the command:
> > > 
> > >   # gst-launch-1.0 -v videotestsrc \
> > >     ! video/x-raw,format=RGB,width=640,height=480,framerate=30/1
> > > \
> > >     ! vaapijpegenc quality=90 \
> > >     ! rtpjpegpay ! udpsink host=192.168.0.254 port=5678
> > >   Setting pipeline to PAUSED ...
> > >   Pipeline is PREROLLING ...
> > >   Got context from element 'vaapiencodejpeg0':
> > > gst.vaapi.Display=context,
> > > gst.vaapi.Display=(GstVaapiDisplay)"\(GstVaapiDisplayDRM\)\
> > > vaapidisplaydrm1";
> > >   ERROR: from element
> > > /GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0: Internal
> > > data stream error.
> > >   Additional debug info:
> > >   gstbasesrc.c(2939): gst_base_src_loop ():
> > > /GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0:
> > >   streaming stopped, reason not-negotiated (-4)
> > >   ERROR: pipeline doesn't want to preroll.
> > >   Setting pipeline to NULL ...
> > >   Freeing pipeline ...
> > > 
> > > This command works fine with the "NV12" format but fails with
> > > "RGB".
> > > Also "jpegenc" does not like it. Obviously, I missed something!?
> > 
> > You'll need to add color conversion. With VAAPI, you can use
> > vaapipostproc, with jpegenc, videoconvert. The second will work for
> > both, but vaapipostproc uses the GPU.
> 
> OK, the following works:
> 
>   # gst-launch-1.0 -v videotestsrc \
>     ! video/x-raw,format=RGB,width=640,height=480,framerate=30/1 \
>     ! videoconvert ! vaapijpegenc quality=90 \
>     ! rtpjpegpay ! udpsink host=192.168.0.254 port=5678
> 
> Also for "jpegenc". But the command using "vaapipostproc" fails:
> 
>   # gst-launch-1.0 -v videotestsrc \
>     ! video/x-raw,format=RGB,width=640,height=480,framerate=30/1 \
>     ! vaapipostproc ! vaapijpegenc quality=90 \
>     ! rtpjpegpay ! udpsink host=192.168.0.254 port=5678
>   Setting pipeline to PAUSED ...
>   Pipeline is PREROLLING ...
>   Got context from element 'vaapiencodejpeg0':
> gst.vaapi.Display=context,
> gst.vaapi.Display=(GstVaapiDisplay)"\(GstVaapiDisplayDRM\)\
> vaapidisplaydrm1";
>   ERROR: from element
> /GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0: Internal data
> stream error.
>   Additional debug info:
>   gstbasesrc.c(2939): gst_base_src_loop ():
> /GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0:
>   streaming stopped, reason not-negotiated (-4)
>   ERROR: pipeline doesn't want to preroll.
>   Setting pipeline to NULL ...
>   Freeing pipeline ...
> 
> But it work if I use "RGBx" format with little CPU usage :). What
> confuses me, is that "gst-inspect" tells me, that the sink of
> "vaapipostproc" also supports "RGB".

In case of HW driven element, the template caps will contain a super
set. The supported formats are then discovered at run-time. 24bit
packed RGB is not supported on my PC here.

> 
> Thanks,
> 
> Wolfgang.