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how to encode to jpeg plz help

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sfaizanh

how to encode to jpeg plz help

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

Sudarshan Bisht

Re: how to encode to jpeg plz help

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 <[hidden email]> 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

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Regards,

Sudarshan Bisht

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