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linking filters with caps

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Chuck Crisler-2

linking filters with caps

Please help! I am stumped and confused by the terminology. I am using GStreamer 0.10.(not sure). I am trying to capture from V4l2 and feed into an H264 encoder (hardly novel). I want to specify the capture size and format (I420). So I setup a caps filter. Here is a snipit of my code.

      g_object_set (G_OBJECT (source_), "device", inputOptions_.ParameterDetails.adapter.cDevice,
                    "always-copy", FALSE, NULL);
      GstCaps *pSrcCaps = gst_caps_new_simple("video/x-raw-yuv",
          "format", G_TYPE_STRING, "I420", "width", G_TYPE_INT, 720, "height", G_TYPE_INT, 480,
          "framerate", GST_TYPE_FRACTION, 30, 1, NULL);

      // Initialize the encoder.
      g_object_set (G_OBJECT (encoder_), "tune", (guint)4, // zerolatency
                    "byte-stream", (gboolean)TRUE,
                    "bitrate", (guint)inputOptions_.ParameterDetails.adapter.iTransmitBitrate, NULL);
...

      // Add the elements to the pipeline.
      gst_bin_add_many(GST_BIN(mainPipeline_), source_, encoder_, muxer_, sink_, NULL);
      // Link the pipeline together.
      bRet = gst_element_link_filtered(source_, encoder_, pSrcCaps);
      gst_caps_unref(pSrcCaps);
      if (!bRet)
      {
         GST_DEBUG("Failed to link filtered elements in pipeline.");
         return bRet;
      }

It is complaining that it can't link the video source to the encoder with my caps filter.

Here is a snipit of the log.

gstutils.c:1585:gst_element_link_pads:[00m trying to link element VideoSrc:(any) to element capsfilter0:sink
Nov 1 17:08:39 0:00:00.064704777 [335m22354[00m 0x88462d8 [32;01mINFO   [00m [00;01;37;41m    GST_ELEMENT_PADS gstelement.c:944:gst_element_get_static_pad:[00m found pad capsfilter0:sink
Nov 1 17:08:39 0:00:00.064792569 [335m22354[00m 0x88462d8 [32;01mINFO   [00m [00;01;31;41m            GST_PADS gstutils.c:1493:prepare_link_maybe_ghosting:[00m VideoSrc and capsfilter0 in same bin, no need for ghost pads
Nov 1 17:08:39 0:00:00.064950133 [335m22354[00m 0x88462d8 [32;01mINFO   [00m [00;01;31;41m            GST_PADS gstpad.c:1886:gst_pad_link_prepare:[00m trying to link VideoSrc:src and capsfilter0:sink
Nov 1 17:08:39 0:00:00.069477022 [335m22354[00m 0x88462d8 [32;01mINFO   [00m [00;01;31;41m            GST_PADS gstpad.c:2059:gst_pad_link:[00m linked VideoSrc:src and capsfilter0:sink, successful
Nov 1 17:08:39 0:00:00.069674954 [335m22354[00m 0x88462d8 [32;01mINFO   [00m [00;01;37;41m    GST_ELEMENT_PADS gstutils.c:1585:gst_element_link_pads:[00m trying to link element capsfilter0:src to element VideoEncoder:(any)
Nov 1 17:08:39 0:00:00.069755204 [335m22354[00m 0x88462d8 [32;01mINFO   [00m [00;01;37;41m    GST_ELEMENT_PADS gstelement.c:944:gst_element_get_static_pad:[00m found pad capsfilter0:src
Nov 1 17:08:39 0:00:00.069826303 [335m22354[00m 0x88462d8 [32;01mINFO   [00m [00;01;31;41m            GST_PADS gstutils.c:1046:gst_pad_check_link:[00m trying to link capsfilter0:src and VideoEncoder:src
Nov 1 17:08:39 0:00:00.069883154 [335m22354[00m 0x88462d8 [32;01mINFO   [00m [00;01;31;41m            GST_PADS gstutils.c:1066:gst_pad_check_link:[00m Sink pad VideoEncoder:src is not sink pad, failed
Nov 1 17:08:39 0:00:00.069939587 [335m22354[00m 0x88462d8 [32;01mINFO   [00m [00;01;31;41m            GST_PADS gstutils.c:1046:gst_pad_check_link:[00m trying to link capsfilter0:src and VideoEncoder:sink
Nov 1 17:08:39 0:00:00.084800392 [335m22354[00m 0x88462d8 [32;01mINFO   [00m [00;01;37;41m    GST_ELEMENT_PADS gstutils.c:1209:gst_element_get_compatible_pad:<VideoEncoder>[00m Could not find a compatible pad to link to capsfilter0:src
Nov 1 17:08:39 0:00:00.084907739 [335m22354[00m 0x88462d8 [32;01mINFO   [00m [00;04m             default gstutils.c:1873:gst_element_link_pads_filtered:[00m Could not link elements

Can anyone see my (probably silly/simple) mistake and point me in the right direction?

Thank you very much!

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Krzysztof Konopko

Re: linking filters with caps

Hi Chuck,

I guess you're using x264enc.

For the "format" capability you should use GST_TYPE_FOURCC rather than
G_TYPE_STRING even though the documentation says it's string (that's why
it's still ugly I guess :)
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-ugly-plugins/html/gst-plugins-ugly-plugins-x264enc.html

If you try to run your app with GST_DEBUG=GST_CAPS:4 you should see
something like this (among others):

0:00:00.076610990 2450 0x9751aa0 DEBUG GST_CAPS
gstutils.c:913:gst_element_get_compatible_pad_template: intersecting
video/x-raw-yuv, format=(string)I420, width=(int)720, height=(int)480,
framerate=(fraction)30/1
0:00:00.076628924 2450 0x9751aa0 DEBUG GST_CAPS
gstutils.c:915:gst_element_get_compatible_pad_template: ..and
video/x-raw-yuv, format=(fourcc){ I420, YV12 }, framerate=(fraction)[
0/1, 2147483647/1 ], width=(int)[ 16, 2147483647 ], height=(int)[ 16,
2147483647 ]
0:00:00.076652937 2450 0x9751aa0 DEBUG GST_CAPS
gstutils.c:921:gst_element_get_compatible_pad_template: caps are not
compatible

The catch here is the "fourcc" type not matching requested "string" type
while everything else seem to match when intersecting caps.

Even better approach is to try gst-launch in such situation. The
following helped me to prove my theory (no errors when using fourcc type):

gst-launch videotestsrc ! 'video/x-raw-yuv, format=(fourcc)I420,
width=(int)720, height=(int)480, framerate=(fraction)30/1' ! x264enc
tune=4 byte-stream=true bitrate=1024 ! fakesink

Kris

On 01/11/12 21:23, Chuck Crisler wrote:

> Please help! I am stumped and confused by the terminology. I am using
> GStreamer 0.10.(not sure). I am trying to capture from V4l2 and feed into
> an H264 encoder (hardly novel). I want to specify the capture size and
> format (I420). So I setup a caps filter. Here is a snipit of my code.
>
> g_object_set (G_OBJECT (source_), "device",
> inputOptions_.ParameterDetails.adapter.cDevice,
> "always-copy", FALSE, NULL);
> GstCaps *pSrcCaps = gst_caps_new_simple("video/x-raw-yuv",
> "format", G_TYPE_STRING, "I420", "width", G_TYPE_INT, 720,
> "height", G_TYPE_INT, 480,
> "framerate", GST_TYPE_FRACTION, 30, 1, NULL);
>
> // Initialize the encoder.
> g_object_set (G_OBJECT (encoder_), "tune", (guint)4, // zerolatency
> "byte-stream", (gboolean)TRUE,
> "bitrate",
> (guint)inputOptions_.ParameterDetails.adapter.iTransmitBitrate, NULL);
> ...
>
> // Add the elements to the pipeline.
> gst_bin_add_many(GST_BIN(mainPipeline_), source_, encoder_, muxer_,
> sink_, NULL);
> // Link the pipeline together.
> bRet = gst_element_link_filtered(source_, encoder_, pSrcCaps);
> gst_caps_unref(pSrcCaps);
> if (!bRet)
> {
> GST_DEBUG("Failed to link filtered elements in pipeline.");
> return bRet;
> }
>
> It is complaining that it can't link the video source to the encoder with
> my caps filter.
>
> Here is a snipit of the log.
>
> gstutils.c:1585:gst_element_link_pads:[00m trying to link element
> VideoSrc:(any) to element capsfilter0:sink
> Nov 1 17:08:39 0:00:00.064704777 [335m22354[00m 0x88462d8
> [32;01mINFO [00m [00;01;37;41m GST_ELEMENT_PADS
> gstelement.c:944:gst_element_get_static_pad:[00m found pad capsfilter0:sink
> Nov 1 17:08:39 0:00:00.064792569 [335m22354[00m 0x88462d8
> [32;01mINFO [00m [00;01;31;41m GST_PADS
> gstutils.c:1493:prepare_link_maybe_ghosting:[00m VideoSrc and capsfilter0
> in same bin, no need for ghost pads
> Nov 1 17:08:39 0:00:00.064950133 [335m22354[00m 0x88462d8
> [32;01mINFO [00m [00;01;31;41m GST_PADS
> gstpad.c:1886:gst_pad_link_prepare:[00m trying to link VideoSrc:src and
> capsfilter0:sink
> Nov 1 17:08:39 0:00:00.069477022 [335m22354[00m 0x88462d8
> [32;01mINFO [00m [00;01;31;41m GST_PADS
> gstpad.c:2059:gst_pad_link:[00m linked VideoSrc:src and capsfilter0:sink,
> successful
> Nov 1 17:08:39 0:00:00.069674954 [335m22354[00m 0x88462d8
> [32;01mINFO [00m [00;01;37;41m GST_ELEMENT_PADS
> gstutils.c:1585:gst_element_link_pads:[00m trying to link element
> capsfilter0:src to element VideoEncoder:(any)
> Nov 1 17:08:39 0:00:00.069755204 [335m22354[00m 0x88462d8
> [32;01mINFO [00m [00;01;37;41m GST_ELEMENT_PADS
> gstelement.c:944:gst_element_get_static_pad:[00m found pad capsfilter0:src
> Nov 1 17:08:39 0:00:00.069826303 [335m22354[00m 0x88462d8
> [32;01mINFO [00m [00;01;31;41m GST_PADS
> gstutils.c:1046:gst_pad_check_link:[00m trying to link capsfilter0:src and
> VideoEncoder:src
> Nov 1 17:08:39 0:00:00.069883154 [335m22354[00m 0x88462d8
> [32;01mINFO [00m [00;01;31;41m GST_PADS
> gstutils.c:1066:gst_pad_check_link:[00m Sink pad VideoEncoder:src is not
> sink pad, failed
> Nov 1 17:08:39 0:00:00.069939587 [335m22354[00m 0x88462d8
> [32;01mINFO [00m [00;01;31;41m GST_PADS
> gstutils.c:1046:gst_pad_check_link:[00m trying to link capsfilter0:src and
> VideoEncoder:sink
> Nov 1 17:08:39 0:00:00.084800392 [335m22354[00m 0x88462d8
> [32;01mINFO [00m [00;01;37;41m GST_ELEMENT_PADS
> gstutils.c:1209:gst_element_get_compatible_pad:<VideoEncoder>[00m Could
> not find a compatible pad to link to capsfilter0:src
> Nov 1 17:08:39 0:00:00.084907739 [335m22354[00m 0x88462d8
> [32;01mINFO [00m [00;04m default
> gstutils.c:1873:gst_element_link_pads_filtered:[00m Could not link elements
>
>
> Can anyone see my (probably silly/simple) mistake and point me in the right
> direction?
>
> Thank you very much!
>
>
>
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>

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Tim-Philipp Müller-2

Re: linking filters with caps

On Thu, 2012-11-01 at 22:46 +0000, Krzysztof Konopko wrote:

Hi,

> For the "format" capability you should use GST_TYPE_FOURCC rather than
> G_TYPE_STRING even though the documentation says it's string (that's why
> it's still ugly I guess :)
> http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-ugly-plugins/html/gst-plugins-ugly-plugins-x264enc.html

Not really. This is a 0.10 vs. 1.0 thing. In 0.10 the caps would

video/x-raw-yuv,format=(fourcc)...

in 1.0 it's

video/x-raw-yuv,format=(string)...

(not necessarily the same identifiers)

Cheers
-Tim

> If you try to run your app with GST_DEBUG=GST_CAPS:4 you should see
> something like this (among others):
>
> 0:00:00.076610990 2450 0x9751aa0 DEBUG GST_CAPS
> gstutils.c:913:gst_element_get_compatible_pad_template: intersecting
> video/x-raw-yuv, format=(string)I420, width=(int)720, height=(int)480,
> framerate=(fraction)30/1
> 0:00:00.076628924 2450 0x9751aa0 DEBUG GST_CAPS
> gstutils.c:915:gst_element_get_compatible_pad_template: ..and
> video/x-raw-yuv, format=(fourcc){ I420, YV12 }, framerate=(fraction)[
> 0/1, 2147483647/1 ], width=(int)[ 16, 2147483647 ], height=(int)[ 16,
> 2147483647 ]
> 0:00:00.076652937 2450 0x9751aa0 DEBUG GST_CAPS
> gstutils.c:921:gst_element_get_compatible_pad_template: caps are not
> compatible
>
> The catch here is the "fourcc" type not matching requested "string" type
> while everything else seem to match when intersecting caps.
>
> Even better approach is to try gst-launch in such situation. The
> following helped me to prove my theory (no errors when using fourcc type):
>
> gst-launch videotestsrc ! 'video/x-raw-yuv, format=(fourcc)I420,
> width=(int)720, height=(int)480, framerate=(fraction)30/1' ! x264enc
> tune=4 byte-stream=true bitrate=1024 ! fakesink
>
> Kris
>
> On 01/11/12 21:23, Chuck Crisler wrote:
> > Please help! I am stumped and confused by the terminology. I am using
> > GStreamer 0.10.(not sure). I am trying to capture from V4l2 and feed into
> > an H264 encoder (hardly novel). I want to specify the capture size and
> > format (I420). So I setup a caps filter. Here is a snipit of my code.
> >
> > g_object_set (G_OBJECT (source_), "device",
> > inputOptions_.ParameterDetails.adapter.cDevice,
> > "always-copy", FALSE, NULL);
> > GstCaps *pSrcCaps = gst_caps_new_simple("video/x-raw-yuv",
> > "format", G_TYPE_STRING, "I420", "width", G_TYPE_INT, 720,
> > "height", G_TYPE_INT, 480,
> > "framerate", GST_TYPE_FRACTION, 30, 1, NULL);
> >
> > // Initialize the encoder.
> > g_object_set (G_OBJECT (encoder_), "tune", (guint)4, // zerolatency
> > "byte-stream", (gboolean)TRUE,
> > "bitrate",
> > (guint)inputOptions_.ParameterDetails.adapter.iTransmitBitrate, NULL);
> > ...
> >
> > // Add the elements to the pipeline.
> > gst_bin_add_many(GST_BIN(mainPipeline_), source_, encoder_, muxer_,
> > sink_, NULL);
> > // Link the pipeline together.
> > bRet = gst_element_link_filtered(source_, encoder_, pSrcCaps);
> > gst_caps_unref(pSrcCaps);
> > if (!bRet)
> > {
> > GST_DEBUG("Failed to link filtered elements in pipeline.");
> > return bRet;
> > }
> >
> > It is complaining that it can't link the video source to the encoder with
> > my caps filter.
> >
> > Here is a snipit of the log.
> >
> > gstutils.c:1585:gst_element_link_pads:[00m trying to link element
> > VideoSrc:(any) to element capsfilter0:sink
> > Nov 1 17:08:39 0:00:00.064704777 [335m22354[00m 0x88462d8
> > [32;01mINFO [00m [00;01;37;41m GST_ELEMENT_PADS
> > gstelement.c:944:gst_element_get_static_pad:[00m found pad capsfilter0:sink
> > Nov 1 17:08:39 0:00:00.064792569 [335m22354[00m 0x88462d8
> > [32;01mINFO [00m [00;01;31;41m GST_PADS
> > gstutils.c:1493:prepare_link_maybe_ghosting:[00m VideoSrc and capsfilter0
> > in same bin, no need for ghost pads
> > Nov 1 17:08:39 0:00:00.064950133 [335m22354[00m 0x88462d8
> > [32;01mINFO [00m [00;01;31;41m GST_PADS
> > gstpad.c:1886:gst_pad_link_prepare:[00m trying to link VideoSrc:src and
> > capsfilter0:sink
> > Nov 1 17:08:39 0:00:00.069477022 [335m22354[00m 0x88462d8
> > [32;01mINFO [00m [00;01;31;41m GST_PADS
> > gstpad.c:2059:gst_pad_link:[00m linked VideoSrc:src and capsfilter0:sink,
> > successful
> > Nov 1 17:08:39 0:00:00.069674954 [335m22354[00m 0x88462d8
> > [32;01mINFO [00m [00;01;37;41m GST_ELEMENT_PADS
> > gstutils.c:1585:gst_element_link_pads:[00m trying to link element
> > capsfilter0:src to element VideoEncoder:(any)
> > Nov 1 17:08:39 0:00:00.069755204 [335m22354[00m 0x88462d8
> > [32;01mINFO [00m [00;01;37;41m GST_ELEMENT_PADS
> > gstelement.c:944:gst_element_get_static_pad:[00m found pad capsfilter0:src
> > Nov 1 17:08:39 0:00:00.069826303 [335m22354[00m 0x88462d8
> > [32;01mINFO [00m [00;01;31;41m GST_PADS
> > gstutils.c:1046:gst_pad_check_link:[00m trying to link capsfilter0:src and
> > VideoEncoder:src
> > Nov 1 17:08:39 0:00:00.069883154 [335m22354[00m 0x88462d8
> > [32;01mINFO [00m [00;01;31;41m GST_PADS
> > gstutils.c:1066:gst_pad_check_link:[00m Sink pad VideoEncoder:src is not
> > sink pad, failed
> > Nov 1 17:08:39 0:00:00.069939587 [335m22354[00m 0x88462d8
> > [32;01mINFO [00m [00;01;31;41m GST_PADS
> > gstutils.c:1046:gst_pad_check_link:[00m trying to link capsfilter0:src and
> > VideoEncoder:sink
> > Nov 1 17:08:39 0:00:00.084800392 [335m22354[00m 0x88462d8
> > [32;01mINFO [00m [00;01;37;41m GST_ELEMENT_PADS
> > gstutils.c:1209:gst_element_get_compatible_pad:<VideoEncoder>[00m Could
> > not find a compatible pad to link to capsfilter0:src
> > Nov 1 17:08:39 0:00:00.084907739 [335m22354[00m 0x88462d8
> > [32;01mINFO [00m [00;04m default
> > gstutils.c:1873:gst_element_link_pads_filtered:[00m Could not link elements
> >
> >
> > Can anyone see my (probably silly/simple) mistake and point me in the right
> > direction?
> >
> > Thank you very much!
> >
> >
> >
> > _______________________________________________
> > gstreamer-devel mailing list
> > [hidden email]
> > http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
> >
>
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

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Krzysztof Konopko

Re: linking filters with caps

Chuck said:
>> I am using GStreamer 0.10.(not sure).

I should have said:
I guess you're using x264enc *and GST 0.10 as I was able to reproduce
your problem based on these assumptions*. Hence we're in 0.10 realm and
(fourcc) should be applied.

What actually matters here is the methodology not the actual
values/types. If he tried 1.0, it would work. If it didn't work with 1.0
for some other (potentially similar) reason, the right approach would
help to discover the root cause of the problem.

Thanks for clarifying things between 0.10 and 1.0 though.

Kris

On 01/11/12 22:52, Tim-Philipp Müller wrote:

> On Thu, 2012-11-01 at 22:46 +0000, Krzysztof Konopko wrote:
>
> Hi,
>
>> For the "format" capability you should use GST_TYPE_FOURCC rather than
>> G_TYPE_STRING even though the documentation says it's string (that's why
>> it's still ugly I guess :)
>> http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-ugly-plugins/html/gst-plugins-ugly-plugins-x264enc.html
>
> Not really. This is a 0.10 vs. 1.0 thing. In 0.10 the caps would
>
> video/x-raw-yuv,format=(fourcc)...
>
> in 1.0 it's
>
> video/x-raw-yuv,format=(string)...
>
> (not necessarily the same identifiers)
>
> Cheers
> -Tim
>
>> If you try to run your app with GST_DEBUG=GST_CAPS:4 you should see
>> something like this (among others):
>>
>> 0:00:00.076610990 2450 0x9751aa0 DEBUG GST_CAPS
>> gstutils.c:913:gst_element_get_compatible_pad_template: intersecting
>> video/x-raw-yuv, format=(string)I420, width=(int)720, height=(int)480,
>> framerate=(fraction)30/1
>> 0:00:00.076628924 2450 0x9751aa0 DEBUG GST_CAPS
>> gstutils.c:915:gst_element_get_compatible_pad_template: ..and
>> video/x-raw-yuv, format=(fourcc){ I420, YV12 }, framerate=(fraction)[
>> 0/1, 2147483647/1 ], width=(int)[ 16, 2147483647 ], height=(int)[ 16,
>> 2147483647 ]
>> 0:00:00.076652937 2450 0x9751aa0 DEBUG GST_CAPS
>> gstutils.c:921:gst_element_get_compatible_pad_template: caps are not
>> compatible
>>
>> The catch here is the "fourcc" type not matching requested "string" type
>> while everything else seem to match when intersecting caps.
>>
>> Even better approach is to try gst-launch in such situation. The
>> following helped me to prove my theory (no errors when using fourcc type):
>>
>> gst-launch videotestsrc ! 'video/x-raw-yuv, format=(fourcc)I420,
>> width=(int)720, height=(int)480, framerate=(fraction)30/1' ! x264enc
>> tune=4 byte-stream=true bitrate=1024 ! fakesink
>>
>> Kris
>>
>> On 01/11/12 21:23, Chuck Crisler wrote:
>>> Please help! I am stumped and confused by the terminology. I am using
>>> GStreamer 0.10.(not sure). I am trying to capture from V4l2 and feed into
>>> an H264 encoder (hardly novel). I want to specify the capture size and
>>> format (I420). So I setup a caps filter. Here is a snipit of my code.
>>>
>>> g_object_set (G_OBJECT (source_), "device",
>>> inputOptions_.ParameterDetails.adapter.cDevice,
>>> "always-copy", FALSE, NULL);
>>> GstCaps *pSrcCaps = gst_caps_new_simple("video/x-raw-yuv",
>>> "format", G_TYPE_STRING, "I420", "width", G_TYPE_INT, 720,
>>> "height", G_TYPE_INT, 480,
>>> "framerate", GST_TYPE_FRACTION, 30, 1, NULL);
>>>
>>> // Initialize the encoder.
>>> g_object_set (G_OBJECT (encoder_), "tune", (guint)4, // zerolatency
>>> "byte-stream", (gboolean)TRUE,
>>> "bitrate",
>>> (guint)inputOptions_.ParameterDetails.adapter.iTransmitBitrate, NULL);
>>> ...
>>>
>>> // Add the elements to the pipeline.
>>> gst_bin_add_many(GST_BIN(mainPipeline_), source_, encoder_, muxer_,
>>> sink_, NULL);
>>> // Link the pipeline together.
>>> bRet = gst_element_link_filtered(source_, encoder_, pSrcCaps);
>>> gst_caps_unref(pSrcCaps);
>>> if (!bRet)
>>> {
>>> GST_DEBUG("Failed to link filtered elements in pipeline.");
>>> return bRet;
>>> }
>>>
>>> It is complaining that it can't link the video source to the encoder with
>>> my caps filter.
>>>
>>> Here is a snipit of the log.
>>>
>>> gstutils.c:1585:gst_element_link_pads:[00m trying to link element
>>> VideoSrc:(any) to element capsfilter0:sink
>>> Nov 1 17:08:39 0:00:00.064704777 [335m22354[00m 0x88462d8
>>> [32;01mINFO [00m [00;01;37;41m GST_ELEMENT_PADS
>>> gstelement.c:944:gst_element_get_static_pad:[00m found pad capsfilter0:sink
>>> Nov 1 17:08:39 0:00:00.064792569 [335m22354[00m 0x88462d8
>>> [32;01mINFO [00m [00;01;31;41m GST_PADS
>>> gstutils.c:1493:prepare_link_maybe_ghosting:[00m VideoSrc and capsfilter0
>>> in same bin, no need for ghost pads
>>> Nov 1 17:08:39 0:00:00.064950133 [335m22354[00m 0x88462d8
>>> [32;01mINFO [00m [00;01;31;41m GST_PADS
>>> gstpad.c:1886:gst_pad_link_prepare:[00m trying to link VideoSrc:src and
>>> capsfilter0:sink
>>> Nov 1 17:08:39 0:00:00.069477022 [335m22354[00m 0x88462d8
>>> [32;01mINFO [00m [00;01;31;41m GST_PADS
>>> gstpad.c:2059:gst_pad_link:[00m linked VideoSrc:src and capsfilter0:sink,
>>> successful
>>> Nov 1 17:08:39 0:00:00.069674954 [335m22354[00m 0x88462d8
>>> [32;01mINFO [00m [00;01;37;41m GST_ELEMENT_PADS
>>> gstutils.c:1585:gst_element_link_pads:[00m trying to link element
>>> capsfilter0:src to element VideoEncoder:(any)
>>> Nov 1 17:08:39 0:00:00.069755204 [335m22354[00m 0x88462d8
>>> [32;01mINFO [00m [00;01;37;41m GST_ELEMENT_PADS
>>> gstelement.c:944:gst_element_get_static_pad:[00m found pad capsfilter0:src
>>> Nov 1 17:08:39 0:00:00.069826303 [335m22354[00m 0x88462d8
>>> [32;01mINFO [00m [00;01;31;41m GST_PADS
>>> gstutils.c:1046:gst_pad_check_link:[00m trying to link capsfilter0:src and
>>> VideoEncoder:src
>>> Nov 1 17:08:39 0:00:00.069883154 [335m22354[00m 0x88462d8
>>> [32;01mINFO [00m [00;01;31;41m GST_PADS
>>> gstutils.c:1066:gst_pad_check_link:[00m Sink pad VideoEncoder:src is not
>>> sink pad, failed
>>> Nov 1 17:08:39 0:00:00.069939587 [335m22354[00m 0x88462d8
>>> [32;01mINFO [00m [00;01;31;41m GST_PADS
>>> gstutils.c:1046:gst_pad_check_link:[00m trying to link capsfilter0:src and
>>> VideoEncoder:sink
>>> Nov 1 17:08:39 0:00:00.084800392 [335m22354[00m 0x88462d8
>>> [32;01mINFO [00m [00;01;37;41m GST_ELEMENT_PADS
>>> gstutils.c:1209:gst_element_get_compatible_pad:<VideoEncoder>[00m Could
>>> not find a compatible pad to link to capsfilter0:src
>>> Nov 1 17:08:39 0:00:00.084907739 [335m22354[00m 0x88462d8
>>> [32;01mINFO [00m [00;04m default
>>> gstutils.c:1873:gst_element_link_pads_filtered:[00m Could not link elements
>>>
>>>
>>> Can anyone see my (probably silly/simple) mistake and point me in the right
>>> direction?
>>>
>>> Thank you very much!
>>>
>>>
>>>
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Tim-Philipp Müller-2

Re: linking filters with caps

In reply to this post by Tim-Philipp Müller-2

On Thu, 2012-11-01 at 22:52 +0000, Tim-Philipp Müller wrote:

> in 1.0 it's
>
> video/x-raw-yuv,format=(string)...
>

Err, make that

video/x-raw, format=(string)...

-Tim

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