[gst-devel] Writing a new plugin from template/existing plugin

Tue Oct 27 21:55:39 CET 2009

Ionut Dediu schrieb:
> Hi all,
> 
> I am an absolute beginner to gstreamer; I want to write a transform
> filter. For this I took as an example the edgetv filter and modified it.
> The code is exactly the same, except canging the name of the plugin and
> functions/structures to reflect the new name, but the rest of the code
> is unchanged. It's based on GstVideoFilter. When I test the plugin I get
> the following error:
> 
> $gst-launch -v videotestsrc ! gimpcartoon ! ffmpegcolorspace ! autovideosink
> 
> ** (gst-launch-0.10:15527): WARNING **:
> !!!!!!!!!!!gst_gimp_cartoon_base_init
> 
> 
> ** (gst-launch-0.10:15527): WARNING **:
> !!!!!!!!!!!gst_gimp_cartoon_class_init
> 
> Setting pipeline to PAUSED ...
> 
> ** (gst-launch-0.10:15527): WARNING **: !!!!!!!!!!!gst_gimp_cartoon_start
> 
> /GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0.GstPad:src: caps =
> video/x-raw-rgb, bpp=(int)32, endianness=(int)4321, depth=(int)24,
> red_mask=(int)65280, green_mask=(int)16711680, blue_mask=(int)-16777216,
> width=(int)320, height=(int)240, framerate=(fraction)30/1
> Pipeline is PREROLLING ...
> 
> ** (gst-launch-0.10:15527): WARNING **: !!!!!!!!!!!gst_gimp_cartoon_set_caps
> 
> /GstPipeline:pipeline0/GstGimpCartoon:gimpcartoon0.GstPad:src: caps =
> video/x-raw-rgb, bpp=(int)32, endianness=(int)4321, depth=(int)24,
> red_mask=(int)65280, green_mask=(int)16711680, blue_mask=(int)-16777216,
> width=(int)320, height=(int)240, framerate=(fraction)30/1
> /GstPipeline:pipeline0/GstGimpCartoon:gimpcartoon0.GstPad:sink: caps =
> video/x-raw-rgb, bpp=(int)32, endianness=(int)4321, depth=(int)24,
> red_mask=(int)65280, green_mask=(int)16711680, blue_mask=(int)-16777216,
> width=(int)320, height=(int)240, framerate=(fraction)30/1
> 
> ** (gst-launch-0.10:15527): WARNING **: gimpcartoon0: could not get in_size
> ERROR: from element
> /GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0: Internal data flow
> error.
> Additional debug info:
> gstbasesrc.c(2330): gst_base_src_loop ():
> /GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0:
> streaming task paused, reason error (-5)
> ERROR: pipeline doesn't want to preroll.
> Setting pipeline to NULL ...
> /GstPipeline:pipeline0/GstGimpCartoon:gimpcartoon0.GstPad:src: caps = NULL
> /GstPipeline:pipeline0/GstGimpCartoon:gimpcartoon0.GstPad:sink: caps = NULL
> /GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0.GstPad:src: caps = NULL
> FREEING pipeline ...
> 
> ** (gst-launch-0.10:15527): WARNING **: !!!!!!!!!!!gst_gimp_cartoon_finalize
> 
> After setting GST_DEBUG I got more info:
> 
> ** (gst-launch-0.10:15523): WARNING **: !!!!!!!!!!!gst_gimp_cartoon_set_caps
> 
> /GstPipeline:pipeline0/GstGimpCartoon:gimpcartoon0.GstPad:src: caps =
> video/x-raw-rgb, bpp=(int)32, endianness=(int)4321, depth=(int)24,
> red_mask=(int)65280, green_mask=(int)16711680, blue_mask=(int)-16777216,
> width=(int)320, height=(int)240, framerate=(fraction)30/1
> /GstPipeline:pipeline0/GstGimpCartoon:gimpcartoon0.GstPad:sink: caps =
> video/x-raw-rgb, bpp=(int)32, endianness=(int)4321, depth=(int)24,
> red_mask=(int)65280, green_mask=(int)16711680, blue_mask=(int)-16777216,
> width=(int)320, height=(int)240, framerate=(fraction)30/1
> 
> ** (gst-launch-0.10:15523): WARNING **: gimpcartoon0: could not get in_size
> 0:00:00.273914500 [332m15523[00m  0x9953f20 [31;01mERROR[00m
> [00m       basetransform
> gstbasetransform.c:1383:gst_base_transform_prepare_output_buffer:<gimpcartoon0>[00m
> unknown output size
> 0:00:00.274001592 [332m15523[00m  0x9953f20 [33;01mWARN [00m
> [00m       basetransform
> gstbasetransform.c:1925:gst_base_transform_handle_buffer:<gimpcartoon0>[00m
> could not get buffer from pool: error
> 0:00:00.274025967 [332m15523[00m  0x9953f20 [32;01mINFO [00m
> [00m             basesrc
> gstbasesrc.c:2278:gst_base_src_loop:<videotestsrc0>[00m pausing after
> gst_pad_push() = error
> 0:00:00.274063891 [332m15523[00m  0x9953f20 [33;01mWARN [00m
> [00m             basesrc
> gstbasesrc.c:2330:gst_base_src_loop:<videotestsrc0>[00m error: Internal
> data flow error.
> 0:00:00.274084354 [332m15523[00m  0x9953f20 [33;01mWARN [00m
> [00m             basesrc
> gstbasesrc.c:2330:gst_base_src_loop:<videotestsrc0>[00m error:
> streaming task paused, reason error (-5)
> 0:00:00.274114735 [332m15523[00m  0x9953f20 [32;01mINFO [00m
> [00;01;31;47m    GST_ERROR_SYSTEM
> gstelement.c:1675:gst_element_message_full:<videotestsrc0>[00m posting
> message: Internal data flow error.
> 0:00:00.274165859 [332m15523[00m  0x9953f20 [32;01mINFO [00m
> [00;01;31;47m    GST_ERROR_SYSTEM
> gstelement.c:1698:gst_element_message_full:<videotestsrc0>[00m posted
> error message: Internal data flow error.
> ERROR: from element
> /GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0: Internal data flow
> error.
> 0:00:00.274342697 [332m15523[00m  0x9953f20 [32;01mINFO [00m
> [00;01;31m          GST_STATES
> gstbin.c:2738:bin_handle_async_done:<autovideosink0>[00m committing
> state from READY to PAUSED, old pending PAUSED
> 0:00:00.274367002 [332m15523[00m  0x9953f20 [32;01mINFO [00m
> [00;01;31m          GST_STATES
> gstbin.c:2753:bin_handle_async_done:<autovideosink0>[00m completed
> state change, pending VOID
> 0:00:00.274396894 [332m15523[00m  0x9953f20 [32;01mINFO [00m
> [00;01;31m          GST_STATES
> gstbin.c:2738:bin_handle_async_done:<pipeline0>[00m committing state
> from READY to PAUSED, old pending PAUSED
> 0:00:00.274420570 [332m15523[00m  0x9953f20 [32;01mINFO [00m
> [00;01;31m          GST_STATES
> gstbin.c:2753:bin_handle_async_done:<pipeline0>[00m completed state
> change, pending VOID
> ERROR: pipeline doesn't want to preroll.
> 
> What is strange is that other than refactoring edgetv and adding some
> warnings my filter looks exactly like edgetv that works ok... Is there
> some configure.ac/Makefile.am magic I did not enchant ?
> 
> I am stuck on this, help :D

Can you post the source?

Stefan

> 
> Thanks
> 
> 
> 
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