[gst-devel] how to encode to jpeg plz help

[sudarshan bisht]

Instead of first encoding yuv to jpeg and again decoding back it to yuv, its
better to encode it just before pushing to udpsink. And this would maintain
your final goal also.

                                    -queue  -- > jpecgenc->udpsink
src ---> caps filter -> tee
                                   -queue --- > ffmpegcolorspace !
xvimagesink

 gst-launch v4l2src !
'video/x-raw-yuv,width=320,height=240,format=(fourcc)I420,framerate=(fraction)20/1'
! tee name=t  ! queue  ! jpegenc !  udpsink host=127.0.0.1 port=5000   t. !
queue ! ffmpegcolorspace ! xvimagesink


On Wed, Dec 22, 2010 at 4:27 AM, sfaizanh <sfaizanh at yahoo.com> wrote:

>
> hi i have just found out a bug in my program, when i was coding on my pc i
> got different camera, now when i switched my application to laptop it
> dosent
> run because of camera
>
> here is my code and gst command line:
>
> Command Line:
> gst-launch v4l2src !
> image/jpeg,width=320,height=240,framerate=\(fraction\)20/1 !
> ffmpegcolorspace ! tee name=t ! udpsink host=127.0.0.1 port=5000 t. ! queue
> ! jpegdec ! xvimagesink
>
> C code
>
>        GstCaps *caps;
>        // Outgoing Pipelines
>        videoPipeline = gst_pipeline_new("videoPipeline");
>        audioPipeline = gst_pipeline_new("audioPipeline");
>        /* create video elements */
>
>        src = gst_element_factory_make("v4l2src", "video-src");
>        splitter = gst_element_factory_make("tee", "video-splitter");
>        sink = gst_element_factory_make("xvimagesink", "video-localsink");
>        videoStream = gst_element_factory_make("udpsink",
> "video-transmitter");
>        queue1 = gst_element_factory_make("queue","queue1");
>        queue2 = gst_element_factory_make("queue","queue2");
>
>        videoDec = gst_element_factory_make("jpegdec", "decoder");
>        videoFilter = gst_element_factory_make ("ffmpegcolorspace",
> "filter");
>
>        if (!videoPipeline)
>        {
>                printf("GStreamer Error: Could not create pipeline\n");
>        }
>
>        if(!src || !videoStream || !sink || !videoDec || !videoFilter)
>        {
>
>                printf("GStreamer Error: Video Elements: Could not create
> element\n");
>        }
>
>        if (!splitter)
>        {
>
>                printf("GStreamer Error: Splitter Element: Could not create
> video
> splitter\n");
>        }
>
>        if (!videoStream)
>        {
>                printf("Stream Creation failure.\n");
>        }
>
>        g_object_set(G_OBJECT(src),"device","/dev/video0",NULL);
>
>        caps = gst_caps_new_simple ("image/jpeg",
>                        "width", G_TYPE_INT, 320,
>                        "height", G_TYPE_INT, 240,
>                        "framerate",GST_TYPE_FRACTION,100,1,
>                        NULL);
>
>        // UDP Connection
>        g_object_set(G_OBJECT(videoStream),"host",ipaddr, "port",
> outputPort,
> NULL);
>
>        gst_bin_add_many(GST_BIN(videoPipeline),src, splitter, sink,
> videoDec,
> videoFilter, videoStream, queue1, queue2, NULL);
>
>        if(!gst_element_link_many(src, splitter, NULL))
>        {
>                printf("Source -> Splitter Link failure\n");
>        }
>
>
>        pad1 = gst_element_get_request_pad(splitter, "src%d");
>        pad2 = gst_element_get_request_pad(splitter, "src%d");
>
>        gst_element_link(splitter, queue1);
>        gst_element_link(splitter, queue2);
>
>        if(!gst_element_link_filtered (queue1, videoStream, caps)) {
>                printf("Link between queue and stream failed.\n");
>        }
>
>        if (!gst_element_link_many(queue2, videoDec, videoFilter, sink,
> NULL))
>        {
>                printf("queue -> Local Src link failed\n");
>        }
>
>
> now i want to encode it to jpep because my camera dosent support image/jpeg
> but it supports video/x-raw-yuv, so i figured out the command line
>
> gst-launch v4l2src !
> video/x-raw-yuv,width=320,height=240,framerate=\(fraction\)5/1 !
> ffmpegcolorspace ! jpegenc ! tee name=t ! udpsink host=127.0.0.1 port=5000
> t. ! queue ! jpegdec ! xvimagesink
>
> now can any body explain me how to enccode it :S
> im stuck in code :S
>
>                                                         -queue -> updsink
> Source -> encode.to.jpeg -> filter -> tee
>                                                         -queue ->
> decode.jpeg > xvimagesink
>
> --
> View this message in context:
> http://gstreamer-devel.966125.n4.nabble.com/how-to-encode-to-jpeg-plz-help-tp3159848p3159848.html
> Sent from the GStreamer-devel mailing list archive at Nabble.com.
>
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-- 
Regards,

Sudarshan Bisht
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