TVP7002 and 576i not working using gstreamer

Hi,

I am trying to use a TVP7002 on a DM368 board with gstreamer.
The source is a VGA to YUV converter which output 576i frames.

Here is the command used:
gst-launch -v -e v4l2src always-copy=FALSE input-src=component chain-ipipe=true ! video/x-raw-yuv,width=720,height=576 ! fakesink

It starts, but tells :

Setting pipeline to PAUSED ...
davinci_resizer davinci_resizer.2: RSZ_G_CONFIG:0:1:124
vpfe-capture vpfe-capture: IPIPE Chained
vpfe-capture vpfe-capture: Resizer present
tvp7002 1-005c: querystd, erorxxx, val = 0, val1 = 271
/GstPipeline:pipeline0/GstV4l2Src:v4l2src0: queue-size = 3
/GstPipeline:pipeline0/GstV4l2Src:v4l2src0.GstPad:src: caps = video/x-raw-yuv, format=(fourcc)UYVY, framerate=(fraction)30000/1001, width=(int)720,
height=(int)576
Pipeline is live and does not need PREROLL ...
WARNING: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Video input device did not accept new frame rate setting.
Additional debug info:
../../../src/sys/v4l2/v4l2src_calls.c(342): gst_v4l2src_set_capture (): /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
system error: Invalid argument
Setting pipeline to PLAYING ...
New clock: GstSystemClock

I can give you the TVP7002 register values if you want...
If I have a HD source (from a camera) I can do this capture :
gst-launch -v -e v4l2src always-copy=FALSE input-src=component chain-ipipe=true ! video/x-raw-yuv,format=\(fourcc\)NV12, width=1280, height=720, framerate=\(fraction\)23/1 ! queue ! dmaiaccel ! dmaienc_h264 encodingpreset=2 ratecontrol=2 intraframeinterval=23 idrinterval=46 targetbitrate=2000000 bytestream=true ! dmaiperf print-arm-load=true ! rtph264pay ! udpsink port=3000 host=192.168.10.1 sync=false enable-last-buffer=false

But with the 576i source, the same pipeline says :
davinci_resizer davinci_resizer.2: RSZ_G_CONFIG:0:1:124
vpfe-capture vpfe-capture: IPIPE Chained
vpfe-capture vpfe-capture: Resizer present
tvp7002 1-005c: querystd, erorxxx, val = 0, val1 = 272
ERROR: Pipeline doesn't want to pause.
WARNING: from element /GstPipeline:pipeline0/GstDmaiperf:dmaiperf0: Could not get/set settings from/on resource.
Additional debug info:
../../src/src/gsttidmaiperf.c(273): gst_dmaiperf_start (): /GstPipeline:pipeline0/GstDmaiperf:dmaiperf0:
Engine name not specified, not printing DSP information
ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Could not negotiate format
Additional debug info:
../../../../src/libs/gst/base/gstbasesrc.c(2778): gst_base_src_start (): /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
Check your filtered caps, if any
Setting pipeline to NULL ...
Freeing pipeline ...

Is there something specific to do in order to make TVP7002 support the source ?

Thanks in advance for your help,

Regards,
JM