ximagesrc to jpegenc

[Arnaud Loonstra]

I seem to be hitting a bug or missing a point. I just want to stream an 
ximagesrc to mjpeg rtp stream, like

gst-launch-1.0 -v ximagesrc xname=xclock ! jpegenc ! rtpjpegpay ! 
udpsink ...

I first test this but it fails

gst-launch-1.0 -v ximagesrc xname=xclock use-damage=false ! videoconvert 
! jpegenc ! jpegdec ! ximagesink

GstXImageSrc:ximagesrc0: Internal data flow error.

Whatever pipeline I try it gives errors.

The only one that worked was:
gst-launch-1.0 -v ximagesrc xname=xclock ! videoconvert ! jpegenc ! 
jpegdec ! glimagesink

However sending that to rtpjpegpay gives:

gst-launch-1.0 -v ximagesrc xname=xclock ! videoconvert ! jpegenc ! 
rtpjpegpay

/GstPipeline:pipeline0/GstRtpJPEGPay:rtpjpegpay0.GstPad:src: caps = 
"application/x-rtp\,\ media\=\(string\)video\,\ 
clock-rate\=\(int\)90000\,\ encoding-name\=\(string\)JPEG\,\ 
a-framerate\=\(string\)25.000000\,\ a-framesize\=\(string\)769-371\,\ 
payload\=\(int\)26\,\ ssrc\=\(uint\)3227055378\,\ 
timestamp-offset\=\(uint\)505174886\,\ seqnum-offset\=\(uint\)6704"
/GstPipeline:pipeline0/GstRtpJPEGPay:rtpjpegpay0.GstPad:sink: caps = 
"image/jpeg\,\ sof-marker\=\(int\)4\,\ width\=\(int\)769\,\ 
height\=\(int\)371\,\ pixel-aspect-ratio\=\(fraction\)1/1\,\ 
framerate\=\(fraction\)25/1"
/GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:sink: caps = 
"image/jpeg\,\ sof-marker\=\(int\)4\,\ width\=\(int\)769\,\ 
height\=\(int\)371\,\ pixel-aspect-ratio\=\(fraction\)1/1\,\ 
framerate\=\(fraction\)25/1"
WARNING: from element /GstPipeline:pipeline0/GstRtpJPEGPay:rtpjpegpay0: 
Invalid component
Additional debug info:
gstrtpjpegpay.c(604): gst_rtp_jpeg_pay_read_sof (): 
/GstPipeline:pipeline0/GstRtpJPEGPay:rtpjpegpay0

Is this sof-marker value of 4 valid?

tried with 1.4.4, 1.5.0 (git) and 1.2.4 on linux(x86_64) machines

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