[gst-devel] videoscale fails with v4l2src

[Gabriel Johnson]

Hello,

I am trying to scale a v4l2src but when I add videoscale to the path
something doesn't work correctly.  When I use the command
`gst-launch v4l2src !
video/x-raw-rgb,bpp=16,depth=16,width=720,height=512 ! fakesink`
everything works fine.  When I try and use the command
`gst-launch v4l2src !
video/x-raw-rgb,bpp=16,depth=16,width=720,height=512 ! videoscale !
fakesink`
I get the error "ERROR: from element
/GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Could not negotiate
format".

GST_DEBUG=GST_PAD*:5 gives me the following messages pertaining to the v4l2src
0:00:03.207476000  2122 0x10046050 DEBUG             GST_PADS
gstpad.c:851:gst_pad_activate_push:<capsfilter0:sink> trying to set
activated in push mode
0:00:03.207857000  2122 0x10046050 DEBUG             GST_PADS
gstpad.c:871:gst_pad_activate_push:<capsfilter0:sink> activating pad
from none
0:00:03.208229000  2122 0x10046050 DEBUG             GST_PADS
gstpad.c:581:pre_activate:<capsfilter0:sink> setting ACTIVATE_MODE 1,
unset flushing
0:00:03.208627000  2122 0x10046050 DEBUG             GST_PADS
gstpad.c:907:gst_pad_activate_push:<capsfilter0:sink> activated in
push mode
0:00:03.209278000  2122 0x10046050 DEBUG             GST_PADS
gstpad.c:658:gst_pad_set_active:<v4l2src0:src> activating pad from
none
0:00:03.209663000  2122 0x10046050 DEBUG             GST_PADS
gstpad.c:851:gst_pad_activate_push:<v4l2src0:src> trying to set
activated in push mode
0:00:03.210030000  2122 0x10046050 DEBUG             GST_PADS
gstpad.c:871:gst_pad_activate_push:<v4l2src0:src> activating pad from
none
0:00:03.210379000  2122 0x10046050 DEBUG             GST_PADS
gstpad.c:581:pre_activate:<v4l2src0:src> setting ACTIVATE_MODE 1,
unset flushing
0:00:03.214782000  2122 0x10046050 INFO              GST_PADS
gstpad.c:927:gst_pad_activate_push:<v4l2src0:src> failed to activate
in push mode
0:00:03.215182000  2122 0x10046050 WARN              GST_PADS
gstpad.c:685:gst_pad_set_active:<v4l2src0:src> Failed to activate pad

GST_DEBUG=v4l2src*:5 Gives me the following:
0:00:02.871845000  2133 0x10046050 DEBUG              v4l2src
v4l2src_calls.c:553:gst_v4l2src_fill_format_list:<v4l2src0> got 2
format(s)
0:00:02.872301000  2133 0x10046050 DEBUG              v4l2src
v4l2src_calls.c:805:gst_v4l2src_probe_caps_for_format:<v4l2src0>
Enumerating frame sizes
0:00:02.872720000  2133 0x10046050 DEBUG              v4l2src
v4l2src_calls.c:899:gst_v4l2src_probe_caps_for_format:<v4l2src0>
Failed to enumerate frame sizes for pixelformat RGB4 (Invalid
argument)
0:00:02.873073000  2133 0x10046050 LOG                v4l2src
v4l2src_calls.c:1563:gst_v4l2src_get_nearest_size:<v4l2src0> getting
nearest size to 1x1 with format RGB4
0:00:02.873522000  2133 0x10046050 LOG                v4l2src
v4l2src_calls.c:1617:gst_v4l2src_get_nearest_size:<v4l2src0> got
nearest size 48x32
0:00:02.873857000  2133 0x10046050 LOG                v4l2src
v4l2src_calls.c:1563:gst_v4l2src_get_nearest_size:<v4l2src0> getting
nearest size to 32768x32768 with format RGB4
0:00:02.874219000  2133 0x10046050 LOG                v4l2src
v4l2src_calls.c:1617:gst_v4l2src_get_nearest_size:<v4l2src0> got
nearest size 1024x768
0:00:02.874737000  2133 0x10046050 DEBUG              v4l2src
v4l2src_calls.c:805:gst_v4l2src_probe_caps_for_format:<v4l2src0>
Enumerating frame sizes
0:00:02.875158000  2133 0x10046050 DEBUG              v4l2src
v4l2src_calls.c:899:gst_v4l2src_probe_caps_for_format:<v4l2src0>
Failed to enumerate frame sizes for pixelformat RGBP (Invalid
argument)
0:00:03.208595000  2133 0x10046050 LOG                v4l2src
v4l2src_calls.c:1563:gst_v4l2src_get_nearest_size:<v4l2src0> getting
nearest size to 1x1 with format RGBP
0:00:03.209008000  2133 0x10046050 LOG                v4l2src
v4l2src_calls.c:1617:gst_v4l2src_get_nearest_size:<v4l2src0> got
nearest size 48x32
0:00:03.209339000  2133 0x10046050 LOG                v4l2src
v4l2src_calls.c:1563:gst_v4l2src_get_nearest_size:<v4l2src0> getting
nearest size to 32768x32768 with format RGBP
0:00:03.210053000  2133 0x10046050 LOG                v4l2src
v4l2src_calls.c:1617:gst_v4l2src_get_nearest_size:<v4l2src0> got
nearest size 1024x768

I know that the v4l2 driver I am using isn't very complete that is why
I specify the cap filter to define what the input format is.  Does
anyone have any ideas about what needs to be done to scale a raw video
source?

Thanks,
Gabe