12

I am writing a very basic pipeline on GStreamer 1.0 and I would like to understand why I need a videoconvert before displaying the stream.

gst-launch-1.0 videotestsrc ! vertigotv ! videoconvert ! autovideosink

If I remove the videoconvert from the pipeline then I get an error and the stream does not play:

Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
ERROR: from element /GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0: Internal data flow error.
Additional debug info:
gstbasesrc.c(2933): gst_base_src_loop (): /GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0:
streaming task paused, reason not-negotiated (-4)
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
Freeing pipeline ...

I don't get why the caps can't be automatically negotiated.

Here are the capabilities template of the sink pad of vertigo:

Capabilities:
  video/x-raw
             format: { RGBx, BGRx }
              width: [ 1, 2147483647 ]
             height: [ 1, 2147483647 ]
          framerate: [ 0/1, 2147483647/1 ]

Here is the capabilities template of the src pad of autovideosink:

Capabilities:
  ANY

Can someone explain me why this element is necessary to play the pipeline. Why do I need to switch colorspace before displaying the pipeline? Is there a way not to use this element (maybe using caps)?

Improve this question

2 Answers 2

Reset to default
9

vertigotv element can only handle raw video frames in RGBx and BGRx formats. autovideosink can not guarantee support of RGBx / BGRx format. You need videoconvert element to ensure compatibility between vertigotv's source and autovideosink's sink pads.

autovideosink is a bin, which contains actual video sink inside. autovideosink's sink pad capabilities are determined by capabilities of sink pad of it's internal video sink. Pipeline graph with autovideosink which uses glimagesink, without videoconvert

It can use several types of video sink. glimagesink, for example, will work without videoconvert (as it can read RGBx / BGRx frames). osxvideosink, on other hand, will not work without videoconvert (because of lack support for RGBx / BGRx).

In case autovideosink will use video sink with RGBx / BGRx support, videoconvert element will just pass frames through, without performing any job. So, you can safely leave it for all the cases.

Improve this answer
3
  • Cool diagram! Is there a way to auto-generate that?
    – Gabriel Grant
    Nov 10, 2015 at 16:08
  • 5
    Yes, add GST_DEBUG_DUMP_DOR_DIR=. before your command, for example: GST_DEBUG_DUMP_DOR_DIR=. gst-play-1.0 ~/music.mp3 You will have your diagram in .dot format. You can preview or convert it to SVG or PNG later.
    – Kyrylo Polezhaiev
    Nov 10, 2015 at 20:41
  • 4
    @KyryloPolezhaiev I think you meant GST_DEBUG_DUMP_DOT_DIR
    – matt
    Apr 3, 2016 at 4:59
3

My understanding is that autovideosink isn't acting as the sync for the video itself, it is merely acting as an auto-detecting pass-through: it will find an appropriate sink to use by searching the registry of available sinks.

So while autovideosink itself can accept and pass along any type of video stream, the end sink that it is actually sending to likely needs a conversion to a supported format.

For example, on my Ubuntu 14.04 machine, running the pipeline you provided results in the autovideosink passing data to an xvimagesink whose sink pad has more specific requirements:

Capabilities:
  video/x-raw-rgb
          framerate: [ 0/1, 2147483647/1 ]
              width: [ 1, 2147483647 ]
             height: [ 1, 2147483647 ]
  video/x-raw-yuv
          framerate: [ 0/1, 2147483647/1 ]
              width: [ 1, 2147483647 ]
             height: [ 1, 2147483647 ]

Edit:

Specifically, notice that xvimagesink supports raw YUV and raw (24-bit-per-pixel) RGB, whereas vertigotv can only supply BGRx and RGBx (ie 32 bits per pixel: 8 red bits, 8 green bits, 8 blue bits, and 8 ignored bits). So the videoconvert is needed to make them play nicely together.

You can get more info about which sink autovideosink is delegating to, and why it's failing, by running with verbose debugging enabled (I've annotated the relevant lines):

$ gst-launch-0.10  --gst-debug=3 --verbose videotestsrc ! vertigotv !  autovideosink
0:00:00.000249935 28239       0xd13e00 INFO                GST_INIT gstquery.c:107:_gst_query_initialize: init queries
0:00:00.000986921 28239       0xd13e00 INFO                GST_INIT gstmessage.c:73:_gst_message_initialize: init messages
0:00:00.001303128 28239       0xd13e00 INFO      GST_PLUGIN_LOADING gstplugin.c:350:_gst_plugin_initialize: registering 0 static plugins
0:00:00.001442586 28239       0xd13e00 INFO      GST_PLUGIN_LOADING gstplugin.c:255:gst_plugin_register_static: registered static plugin "staticelements"
0:00:00.001465363 28239       0xd13e00 INFO      GST_PLUGIN_LOADING gstplugin.c:257:gst_plugin_register_static: added static plugin "staticelements", result: 1
0:00:00.001492124 28239       0xd13e00 INFO            GST_REGISTRY gstregistry.c:1672:ensure_current_registry: reading registry cache: /home/gabriel/.gstreamer-0.10/registry.x86_64.bin
0:00:00.011542619 28239       0xd13e00 INFO            GST_REGISTRY gstregistrybinary.c:614:gst_registry_binary_read_cache: loaded /home/gabriel/.gstreamer-0.10/registry.x86_64.bin in 0.010022 seconds
0:00:00.011640443 28239       0xd13e00 INFO            GST_REGISTRY gstregistry.c:1522:scan_and_update_registry: Validating plugins from registry cache: /home/gabriel/.gstreamer-0.10/registry.x86_64.bin
0:00:00.012164072 28239       0xd13e00 INFO            GST_REGISTRY gstregistry.c:1634:scan_and_update_registry: Registry cache has not changed
0:00:00.012188670 28239       0xd13e00 INFO            GST_REGISTRY gstregistry.c:1707:ensure_current_registry: registry reading and updating done, result = 1
0:00:00.012205838 28239       0xd13e00 INFO                GST_INIT gst.c:805:init_post: GLib runtime version: 2.40.2
0:00:00.012221254 28239       0xd13e00 INFO                GST_INIT gst.c:807:init_post: GLib headers version: 2.39.1
0:00:00.012253325 28239       0xd13e00 INFO            GST_PIPELINE gstparse.c:334:gst_parse_launch_full: parsing pipeline description 'videotestsrc ! vertigotv ! autovideosink '
0:00:00.015690495 28239       0xd13e00 INFO      GST_PLUGIN_LOADING gstplugin.c:859:gst_plugin_load_file: plugin "/usr/lib/x86_64-linux-gnu/gstreamer-0.10/libgstvideotestsrc.so" loaded
0:00:00.015738624 28239       0xd13e00 INFO     GST_ELEMENT_FACTORY gstelementfactory.c:376:gst_element_factory_create: creating element "videotestsrc"
0:00:00.016500598 28239       0xd13e00 INFO        GST_ELEMENT_PADS gstelement.c:728:gst_element_add_pad:<GstBaseSrc@0xe26090> adding pad 'src'
0:00:00.017049197 28239       0xd13e00 INFO      GST_PLUGIN_LOADING gstplugin.c:859:gst_plugin_load_file: plugin "/usr/lib/x86_64-linux-gnu/gstreamer-0.10/libgsteffectv.so" loaded
0:00:00.017083649 28239       0xd13e00 INFO     GST_ELEMENT_FACTORY gstelementfactory.c:376:gst_element_factory_create: creating element "vertigotv"
0:00:00.017275409 28239       0xd13e00 INFO        GST_ELEMENT_PADS gstelement.c:728:gst_element_add_pad:<GstBaseTransform@0xe2a180> adding pad 'sink'
0:00:00.017320686 28239       0xd13e00 INFO        GST_ELEMENT_PADS gstelement.c:728:gst_element_add_pad:<GstBaseTransform@0xe2a180> adding pad 'src'
0:00:00.017507420 28239       0xd13e00 INFO      GST_PLUGIN_LOADING gstplugin.c:859:gst_plugin_load_file: plugin "/usr/lib/x86_64-linux-gnu/gstreamer-0.10/libgstautodetect.so" loaded
0:00:00.017534322 28239       0xd13e00 INFO     GST_ELEMENT_FACTORY gstelementfactory.c:376:gst_element_factory_create: creating element "autovideosink"
0:00:00.017679118 28239       0xd13e00 INFO        GST_ELEMENT_PADS gstelement.c:728:gst_element_add_pad:<GstAutoVideoSink@0xe2d040> adding pad 'sink'
0:00:00.018056697 28239       0xd13e00 INFO      GST_PLUGIN_LOADING gstplugin.c:859:gst_plugin_load_file: plugin "/usr/lib/x86_64-linux-gnu/gstreamer-0.10/libgstcoreelements.so" loaded
0:00:00.018088912 28239       0xd13e00 INFO     GST_ELEMENT_FACTORY gstelementfactory.c:374:gst_element_factory_create: creating element "fakesink" named "tempsink"
0:00:00.018241424 28239       0xd13e00 INFO        GST_ELEMENT_PADS gstelement.c:728:gst_element_add_pad:<GstBaseSink@0xe061e0> adding pad 'sink'
0:00:00.018298351 28239       0xd13e00 INFO        GST_ELEMENT_PADS gstelement.c:975:gst_element_get_static_pad: found pad tempsink:sink
0:00:00.018321334 28239       0xd13e00 INFO                GST_PADS gstpad.c:1978:gst_pad_link_prepare: trying to link sink:proxypad0 and tempsink:sink
0:00:00.018340322 28239       0xd13e00 INFO                GST_PADS gstpad.c:2161:gst_pad_link_full: linked sink:proxypad0 and tempsink:sink, successful
0:00:00.018381640 28239       0xd13e00 INFO     GST_ELEMENT_FACTORY gstelementfactory.c:376:gst_element_factory_create: creating element "pipeline"
0:00:00.018470159 28239       0xd13e00 INFO            GST_PIPELINE ./grammar.y:569:gst_parse_perform_link: linking videotestsrc0:(any) to vertigotv0:(any) (0/0) with caps "(NULL)"
0:00:00.018497440 28239       0xd13e00 INFO        GST_ELEMENT_PADS gstutils.c:1698:gst_element_link_pads_full: trying to link element videotestsrc0:(any) to element vertigotv0:(any)
0:00:00.018518953 28239       0xd13e00 INFO                GST_PADS gstutils.c:1032:gst_pad_check_link: trying to link videotestsrc0:src and vertigotv0:sink
0:00:00.018797589 28239       0xd13e00 INFO                GST_PADS gstutils.c:1596:prepare_link_maybe_ghosting: videotestsrc0 and vertigotv0 in same bin, no need for ghost pads
0:00:00.018860383 28239       0xd13e00 INFO                GST_PADS gstpad.c:1978:gst_pad_link_prepare: trying to link videotestsrc0:src and vertigotv0:sink
0:00:00.019111071 28239       0xd13e00 INFO                GST_PADS gstpad.c:2161:gst_pad_link_full: linked videotestsrc0:src and vertigotv0:sink, successful
0:00:00.019158154 28239       0xd13e00 INFO            GST_PIPELINE ./grammar.y:569:gst_parse_perform_link: linking vertigotv0:(any) to autovideosink0:(any) (0/0) with caps "(NULL)"
0:00:00.019179561 28239       0xd13e00 INFO        GST_ELEMENT_PADS gstutils.c:1698:gst_element_link_pads_full: trying to link element vertigotv0:(any) to element autovideosink0:(any)
0:00:00.019201500 28239       0xd13e00 INFO                GST_PADS gstutils.c:1032:gst_pad_check_link: trying to link vertigotv0:src and autovideosink0:sink
0:00:00.019477327 28239       0xd13e00 INFO                GST_PADS gstutils.c:1596:prepare_link_maybe_ghosting: vertigotv0 and autovideosink0 in same bin, no need for ghost pads
0:00:00.019510644 28239       0xd13e00 INFO                GST_PADS gstpad.c:1978:gst_pad_link_prepare: trying to link vertigotv0:src and autovideosink0:sink
0:00:00.019734010 28239       0xd13e00 INFO                GST_PADS gstpad.c:2161:gst_pad_link_full: linked vertigotv0:src and autovideosink0:sink, successful
Setting pipeline to PAUSED ...
0:00:00.019859833 28239       0xd13e00 INFO              GST_STATES gstelement.c:2460:gst_element_continue_state:<tempsink> completed state change to NULL
0:00:00.019886786 28239       0xd13e00 INFO        GST_ELEMENT_PADS gstpad.c:1750:gst_pad_unlink: unlinking sink:proxypad0(0xe300c0) and tempsink:sink(0xe28550)
0:00:00.019911274 28239       0xd13e00 INFO        GST_ELEMENT_PADS gstpad.c:1795:gst_pad_unlink: unlinked sink:proxypad0 and tempsink:sink
0:00:00.019930233 28239       0xd13e00 INFO           GST_PARENTAGE gstbin.c:1465:gst_bin_remove_func:<autovideosink0> removed child "tempsink"
0:00:00.019955357 28239       0xd13e00 INFO         GST_REFCOUNTING gstelement.c:3064:gst_element_dispose:<tempsink> dispose
0:00:00.019972245 28239       0xd13e00 INFO        GST_ELEMENT_PADS gstelement.c:847:gst_element_remove_pad:<tempsink> removing pad 'sink'
0:00:00.020004575 28239       0xd13e00 INFO         GST_REFCOUNTING gstelement.c:3088:gst_element_dispose:<tempsink> parent class dispose
0:00:00.020023265 28239       0xd13e00 INFO         GST_REFCOUNTING gstelement.c:3119:gst_element_finalize:<tempsink> finalize
0:00:00.020039132 28239       0xd13e00 INFO         GST_REFCOUNTING gstelement.c:3130:gst_element_finalize:<tempsink> finalize parent
0:00:00.021132401 28239       0xd13e00 INFO      GST_PLUGIN_LOADING gstplugin.c:859:gst_plugin_load_file: plugin "/usr/lib/x86_64-linux-gnu/gstreamer-0.10/libgstxvimagesink.so" loaded

##  Chooses to delegate to xvimagesink:
0:00:00.021161529 28239       0xd13e00 INFO     GST_ELEMENT_FACTORY gstelementfactory.c:374:gst_element_factory_create: creating element "xvimagesink" named "autovideosink0-actual-sink-xvimage"

0:00:00.021335525 28239       0xd13e00 INFO        GST_ELEMENT_PADS gstelement.c:728:gst_element_add_pad:<GstBaseSink@0xe441f0> adding pad 'sink'
0:00:00.021369506 28239       0xd13e00 INFO        GST_ELEMENT_PADS gstelement.c:975:gst_element_get_static_pad: found pad autovideosink0-actual-sink-xvimage:sink
0:00:00.022368391 28239       0xd13e00 INFO              GST_STATES gstelement.c:2460:gst_element_continue_state:<autovideosink0-actual-sink-xvimage> completed state change to READY
0:00:00.022397669 28239       0xd13e00 INFO              GST_STATES gstelement.c:2365:_priv_gst_element_state_changed:<autovideosink0-actual-sink-xvimage> notifying about state-changed NULL to READY (VOID_PENDING pending)
0:00:00.022454798 28239       0xd13e00 INFO        GST_ELEMENT_PADS gstelement.c:975:gst_element_get_static_pad: found pad autovideosink0-actual-sink-xvimage:sink
0:00:00.022476447 28239       0xd13e00 INFO                GST_PADS gstpad.c:1978:gst_pad_link_prepare: trying to link sink:proxypad0 and autovideosink0-actual-sink-xvimage:sink
0:00:00.022495466 28239       0xd13e00 INFO                GST_PADS gstpad.c:2161:gst_pad_link_full: linked sink:proxypad0 and autovideosink0-actual-sink-xvimage:sink, successful
0:00:00.022518658 28239       0xd13e00 INFO              GST_STATES gstbin.c:2237:gst_bin_element_set_state:<autovideosink0-actual-sink-xvimage> skipping transition from READY to  READY, since bin pending is READY : last change state return follows
0:00:00.022538036 28239       0xd13e00 INFO              GST_STATES gstbin.c:2526:gst_bin_change_state_func:<autovideosink0> child 'autovideosink0-actual-sink-xvimage' changed state to 2(READY) successfully
0:00:00.022560002 28239       0xd13e00 INFO              GST_STATES gstelement.c:2460:gst_element_continue_state:<autovideosink0> completed state change to READY
0:00:00.022576724 28239       0xd13e00 INFO              GST_STATES gstelement.c:2365:_priv_gst_element_state_changed:<autovideosink0> notifying about state-changed NULL to READY (VOID_PENDING pending)
0:00:00.022601845 28239       0xd13e00 INFO              GST_STATES gstbin.c:2526:gst_bin_change_state_func:<pipeline0> child 'autovideosink0' changed state to 2(READY) successfully
0:00:00.022625672 28239       0xd13e00 INFO              GST_STATES gstelement.c:2460:gst_element_continue_state:<vertigotv0> completed state change to READY
0:00:00.022643603 28239       0xd13e00 INFO              GST_STATES gstelement.c:2365:_priv_gst_element_state_changed:<vertigotv0> notifying about state-changed NULL to READY (VOID_PENDING pending)
0:00:00.022667598 28239       0xd13e00 INFO              GST_STATES gstbin.c:2526:gst_bin_change_state_func:<pipeline0> child 'vertigotv0' changed state to 2(READY) successfully
0:00:00.022688986 28239       0xd13e00 INFO              GST_STATES gstelement.c:2460:gst_element_continue_state:<videotestsrc0> completed state change to READY
0:00:00.022706878 28239       0xd13e00 INFO              GST_STATES gstelement.c:2365:_priv_gst_element_state_changed:<videotestsrc0> notifying about state-changed NULL to READY (VOID_PENDING pending)
0:00:00.022731032 28239       0xd13e00 INFO              GST_STATES gstbin.c:2526:gst_bin_change_state_func:<pipeline0> child 'videotestsrc0' changed state to 2(READY) successfully
0:00:00.022752163 28239       0xd13e00 INFO              GST_STATES gstelement.c:2435:gst_element_continue_state:<pipeline0> committing state from NULL to READY, pending PAUSED, next PAUSED
0:00:00.022770552 28239       0xd13e00 INFO              GST_STATES gstelement.c:2365:_priv_gst_element_state_changed:<pipeline0> notifying about state-changed NULL to READY (PAUSED pending)
0:00:00.022813421 28239       0xd13e00 INFO              GST_STATES gstelement.c:2442:gst_element_continue_state:<pipeline0> continue state change READY to PAUSED, final PAUSED
0:00:00.022863100 28239       0xd13e00 INFO              GST_STATES gstbin.c:2532:gst_bin_change_state_func:<autovideosink0> child 'autovideosink0-actual-sink-xvimage' is changing state asynchronously to PAUSED
0:00:00.022889332 28239       0xd13e00 INFO              GST_STATES gstbin.c:2532:gst_bin_change_state_func:<pipeline0> child 'autovideosink0' is changing state asynchronously to PAUSED
0:00:00.022974839 28239       0xd13e00 INFO              GST_STATES gstelement.c:2460:gst_element_continue_state:<vertigotv0> completed state change to PAUSED
0:00:00.022994891 28239       0xd13e00 INFO              GST_STATES gstelement.c:2365:_priv_gst_element_state_changed:<vertigotv0> notifying about state-changed READY to PAUSED (VOID_PENDING pending)
0:00:00.023018785 28239       0xd13e00 INFO              GST_STATES gstbin.c:2526:gst_bin_change_state_func:<pipeline0> child 'vertigotv0' changed state to 3(PAUSED) successfully

##  Fails:
0:00:00.023202339 28239       0xd13e00 WARN                 basesrc gstbasesrc.c:2830:gst_base_src_start:<videotestsrc0> error: Could not negotiate format

0:00:00.023224821 28239       0xd13e00 WARN                 basesrc gstbasesrc.c:2830:gst_base_src_start:<videotestsrc0> error: Check your filtered caps, if any
0:00:00.023251496 28239       0xd13e00 INFO        GST_ERROR_SYSTEM gstelement.c:1964:gst_element_message_full:<videotestsrc0> posting message: Could not negotiate format
0:00:00.023277123 28239       0xd13e00 INFO        GST_ERROR_SYSTEM gstelement.c:1987:gst_element_message_full:<videotestsrc0> posted error message: Could not negotiate format
0:00:00.023295847 28239       0xd13e00 WARN                 basesrc gstbasesrc.c:3039:gst_base_src_activate_push:<videotestsrc0> Failed to start in push mode
0:00:00.023310149 28239       0xd13e00 INFO                GST_PADS gstpad.c:986:gst_pad_activate_push:<videotestsrc0:src> failed to activate in push mode
0:00:00.023326434 28239       0xd13e00 WARN                GST_PADS gstpad.c:737:gst_pad_set_active:<videotestsrc0:src> Failed to activate pad
0:00:00.023342647 28239       0xd13e00 INFO              GST_STATES gstelement.c:2768:gst_element_change_state:<videotestsrc0> have FAILURE change_state return
0:00:00.023358781 28239       0xd13e00 INFO              GST_STATES gstelement.c:2335:gst_element_abort_state:<videotestsrc0> aborting state from READY to PAUSED
0:00:00.023375516 28239       0xd13e00 INFO              GST_STATES gstbin.c:2542:gst_bin_change_state_func:<pipeline0> child 'videotestsrc0' failed to go to state 3(PAUSED)
0:00:00.023394254 28239       0xd13e00 INFO              GST_STATES gstelement.c:2768:gst_element_change_state:<pipeline0> have FAILURE change_state return
ERROR: Pipeline doesn't want to pause.
ERROR: from element /GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0: Could not negotiate format
Additional debug info:
gstbasesrc.c(2830): gst_base_src_start (): /GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0:
Check your filtered caps, if any
Setting pipeline to NULL ...
0:00:00.023653104 28239       0xd13e00 INFO              GST_STATES gstelement.c:2460:gst_element_continue_state:<autovideosink0-actual-sink-xvimage> completed state change to READY
0:00:00.023673116 28239       0xd13e00 INFO              GST_STATES gstelement.c:2365:_priv_gst_element_state_changed:<autovideosink0-actual-sink-xvimage> notifying about state-changed READY to READY (VOID_PENDING pending)
0:00:00.023695623 28239       0xd13e00 INFO              GST_STATES gstbin.c:2526:gst_bin_change_state_func:<autovideosink0> child 'autovideosink0-actual-sink-xvimage' changed state to 2(READY) successfully
0:00:00.023721858 28239       0xd13e00 INFO              GST_STATES gstelement.c:2435:gst_element_continue_state:<autovideosink0> committing state from READY to READY, pending NULL, next NULL
0:00:00.023739313 28239       0xd13e00 INFO              GST_STATES gstelement.c:2365:_priv_gst_element_state_changed:<autovideosink0> notifying about state-changed READY to READY (NULL pending)
0:00:00.023761136 28239       0xd13e00 INFO              GST_STATES gstelement.c:2442:gst_element_continue_state:<autovideosink0> continue state change READY to NULL, final NULL
0:00:00.072758482 28239       0xd13e00 INFO              GST_STATES gstelement.c:2460:gst_element_continue_state:<autovideosink0-actual-sink-xvimage> completed state change to NULL
0:00:00.073073115 28239       0xd13e00 INFO              GST_STATES gstelement.c:2365:_priv_gst_element_state_changed:<autovideosink0-actual-sink-xvimage> notifying about state-changed READY to NULL (VOID_PENDING pending)
0:00:00.073145803 28239       0xd13e00 INFO              GST_STATES gstbin.c:2526:gst_bin_change_state_func:<autovideosink0> child 'autovideosink0-actual-sink-xvimage' changed state to 1(NULL) successfully
0:00:00.073215511 28239       0xd13e00 INFO              GST_STATES gstelement.c:2460:gst_element_continue_state:<autovideosink0-actual-sink-xvimage> completed state change to NULL
0:00:00.073237889 28239       0xd13e00 INFO        GST_ELEMENT_PADS gstpad.c:1750:gst_pad_unlink: unlinking sink:proxypad0(0xe300c0) and autovideosink0-actual-sink-xvimage:sink(0xe28550)
0:00:00.073260645 28239       0xd13e00 INFO        GST_ELEMENT_PADS gstpad.c:1795:gst_pad_unlink: unlinked sink:proxypad0 and autovideosink0-actual-sink-xvimage:sink
0:00:00.073278021 28239       0xd13e00 INFO           GST_PARENTAGE gstbin.c:1465:gst_bin_remove_func:<autovideosink0> removed child "autovideosink0-actual-sink-xvimage"
0:00:00.073305704 28239       0xd13e00 INFO     GST_ELEMENT_FACTORY gstelementfactory.c:374:gst_element_factory_create: creating element "fakesink" named "tempsink"
0:00:00.073363921 28239       0xd13e00 INFO        GST_ELEMENT_PADS gstelement.c:728:gst_element_add_pad:<GstBaseSink@0xe38270> adding pad 'sink'
0:00:00.073434397 28239       0xd13e00 INFO        GST_ELEMENT_PADS gstelement.c:975:gst_element_get_static_pad: found pad tempsink:sink
0:00:00.073475704 28239       0xd13e00 INFO                GST_PADS gstpad.c:1978:gst_pad_link_prepare: trying to link sink:proxypad0 and tempsink:sink
0:00:00.073515052 28239       0xd13e00 INFO                GST_PADS gstpad.c:2161:gst_pad_link_full: linked sink:proxypad0 and tempsink:sink, successful
0:00:00.073554466 28239       0xd13e00 INFO              GST_STATES gstelement.c:2460:gst_element_continue_state:<autovideosink0> completed state change to NULL
0:00:00.073591737 28239       0xd13e00 INFO              GST_STATES gstelement.c:2365:_priv_gst_element_state_changed:<autovideosink0> notifying about state-changed READY to NULL (VOID_PENDING pending)
0:00:00.073632464 28239       0xd13e00 INFO              GST_STATES gstbin.c:2526:gst_bin_change_state_func:<pipeline0> child 'autovideosink0' changed state to 1(NULL) successfully
0:00:00.073673611 28239       0xd13e00 INFO              GST_STATES gstelement.c:2435:gst_element_continue_state:<vertigotv0> committing state from PAUSED to READY, pending NULL, next NULL
0:00:00.073692871 28239       0xd13e00 INFO              GST_STATES gstelement.c:2365:_priv_gst_element_state_changed:<vertigotv0> notifying about state-changed PAUSED to READY (NULL pending)
0:00:00.073716132 28239       0xd13e00 INFO              GST_STATES gstelement.c:2442:gst_element_continue_state:<vertigotv0> continue state change READY to NULL, final NULL
0:00:00.073738757 28239       0xd13e00 INFO              GST_STATES gstelement.c:2460:gst_element_continue_state:<vertigotv0> completed state change to NULL
0:00:00.073755238 28239       0xd13e00 INFO              GST_STATES gstelement.c:2365:_priv_gst_element_state_changed:<vertigotv0> notifying about state-changed READY to NULL (VOID_PENDING pending)
0:00:00.073777985 28239       0xd13e00 INFO              GST_STATES gstbin.c:2526:gst_bin_change_state_func:<pipeline0> child 'vertigotv0' changed state to 1(NULL) successfully
0:00:00.073802545 28239       0xd13e00 INFO              GST_STATES gstelement.c:2460:gst_element_continue_state:<videotestsrc0> completed state change to NULL
0:00:00.073835907 28239       0xd13e00 INFO              GST_STATES gstelement.c:2365:_priv_gst_element_state_changed:<videotestsrc0> notifying about state-changed READY to NULL (VOID_PENDING pending)
0:00:00.073880582 28239       0xd13e00 INFO              GST_STATES gstbin.c:2526:gst_bin_change_state_func:<pipeline0> child 'videotestsrc0' changed state to 1(NULL) successfully
0:00:00.073937459 28239       0xd13e00 INFO         GST_REFCOUNTING gstelement.c:3064:gst_element_dispose:<autovideosink0-actual-sink-xvimage> dispose
0:00:00.073974764 28239       0xd13e00 INFO        GST_ELEMENT_PADS gstelement.c:847:gst_element_remove_pad:<autovideosink0-actual-sink-xvimage> removing pad 'sink'
0:00:00.074018963 28239       0xd13e00 INFO         GST_REFCOUNTING gstelement.c:3088:gst_element_dispose:<autovideosink0-actual-sink-xvimage> parent class dispose
0:00:00.074062160 28239       0xd13e00 INFO         GST_REFCOUNTING gstelement.c:3119:gst_element_finalize:<autovideosink0-actual-sink-xvimage> finalize
0:00:00.074100359 28239       0xd13e00 INFO         GST_REFCOUNTING gstelement.c:3130:gst_element_finalize:<autovideosink0-actual-sink-xvimage> finalize parent
0:00:00.074148635 28239       0xd13e00 INFO              GST_STATES gstelement.c:2460:gst_element_continue_state:<pipeline0> completed state change to NULL
0:00:00.074183287 28239       0xd13e00 INFO              GST_STATES gstelement.c:2365:_priv_gst_element_state_changed:<pipeline0> notifying about state-changed READY to NULL (VOID_PENDING pending)
0:00:00.074233570 28239       0xd13e00 INFO              GST_STATES gstbin.c:1784:gst_bin_get_state_func:<pipeline0> getting state
Freeing pipeline ...
0:00:00.074307349 28239       0xd13e00 INFO        GST_ELEMENT_PADS gstpad.c:1750:gst_pad_unlink: unlinking vertigotv0:src(0xe283d0) and autovideosink0:sink(0xe2f030)
0:00:00.074358755 28239       0xd13e00 INFO        GST_ELEMENT_PADS gstpad.c:1795:gst_pad_unlink: unlinked vertigotv0:src and autovideosink0:sink
0:00:00.074414611 28239       0xd13e00 INFO           GST_PARENTAGE gstbin.c:1465:gst_bin_remove_func:<pipeline0> removed child "autovideosink0"
0:00:00.074468451 28239       0xd13e00 INFO              GST_STATES gstelement.c:2460:gst_element_continue_state:<tempsink> completed state change to NULL
0:00:00.074505388 28239       0xd13e00 INFO        GST_ELEMENT_PADS gstpad.c:1750:gst_pad_unlink: unlinking sink:proxypad0(0xe300c0) and tempsink:sink(0xe286d0)
0:00:00.074552141 28239       0xd13e00 INFO        GST_ELEMENT_PADS gstpad.c:1795:gst_pad_unlink: unlinked sink:proxypad0 and tempsink:sink
0:00:00.074593560 28239       0xd13e00 INFO           GST_PARENTAGE gstbin.c:1465:gst_bin_remove_func:<autovideosink0> removed child "tempsink"
0:00:00.074638443 28239       0xd13e00 INFO         GST_REFCOUNTING gstelement.c:3064:gst_element_dispose:<tempsink> dispose
0:00:00.074672764 28239       0xd13e00 INFO        GST_ELEMENT_PADS gstelement.c:847:gst_element_remove_pad:<tempsink> removing pad 'sink'
0:00:00.074709249 28239       0xd13e00 INFO         GST_REFCOUNTING gstelement.c:3088:gst_element_dispose:<tempsink> parent class dispose
0:00:00.074725665 28239       0xd13e00 INFO         GST_REFCOUNTING gstelement.c:3119:gst_element_finalize:<tempsink> finalize
0:00:00.074739197 28239       0xd13e00 INFO         GST_REFCOUNTING gstelement.c:3130:gst_element_finalize:<tempsink> finalize parent
0:00:00.074756577 28239       0xd13e00 INFO         GST_REFCOUNTING gstelement.c:3064:gst_element_dispose:<autovideosink0> dispose
0:00:00.074770399 28239       0xd13e00 INFO        GST_ELEMENT_PADS gstelement.c:847:gst_element_remove_pad:<autovideosink0> removing pad 'sink'
0:00:00.074813009 28239       0xd13e00 INFO         GST_REFCOUNTING gstelement.c:3088:gst_element_dispose:<autovideosink0> parent class dispose
0:00:00.074841876 28239       0xd13e00 INFO         GST_REFCOUNTING gstelement.c:3119:gst_element_finalize:<autovideosink0> finalize
0:00:00.074867385 28239       0xd13e00 INFO         GST_REFCOUNTING gstelement.c:3130:gst_element_finalize:<autovideosink0> finalize parent
0:00:00.074897325 28239       0xd13e00 INFO        GST_ELEMENT_PADS gstpad.c:1750:gst_pad_unlink: unlinking videotestsrc0:src(0xe280d0) and vertigotv0:sink(0xe28250)
0:00:00.074936511 28239       0xd13e00 INFO        GST_ELEMENT_PADS gstpad.c:1795:gst_pad_unlink: unlinked videotestsrc0:src and vertigotv0:sink
0:00:00.075009187 28239       0xd13e00 INFO           GST_PARENTAGE gstbin.c:1465:gst_bin_remove_func:<pipeline0> removed child "vertigotv0"
0:00:00.075044459 28239       0xd13e00 INFO         GST_REFCOUNTING gstelement.c:3064:gst_element_dispose:<vertigotv0> dispose
0:00:00.075069941 28239       0xd13e00 INFO        GST_ELEMENT_PADS gstelement.c:847:gst_element_remove_pad:<vertigotv0> removing pad 'src'
0:00:00.075102707 28239       0xd13e00 INFO        GST_ELEMENT_PADS gstelement.c:847:gst_element_remove_pad:<vertigotv0> removing pad 'sink'
0:00:00.075135763 28239       0xd13e00 INFO         GST_REFCOUNTING gstelement.c:3088:gst_element_dispose:<vertigotv0> parent class dispose
0:00:00.075165136 28239       0xd13e00 INFO         GST_REFCOUNTING gstelement.c:3119:gst_element_finalize:<vertigotv0> finalize
0:00:00.075190351 28239       0xd13e00 INFO         GST_REFCOUNTING gstelement.c:3130:gst_element_finalize:<vertigotv0> finalize parent
0:00:00.075222928 28239       0xd13e00 INFO           GST_PARENTAGE gstbin.c:1465:gst_bin_remove_func:<pipeline0> removed child "videotestsrc0"
0:00:00.075260964 28239       0xd13e00 INFO         GST_REFCOUNTING gstelement.c:3064:gst_element_dispose:<videotestsrc0> dispose
0:00:00.075287035 28239       0xd13e00 INFO        GST_ELEMENT_PADS gstelement.c:847:gst_element_remove_pad:<videotestsrc0> removing pad 'src'
0:00:00.075322435 28239       0xd13e00 INFO         GST_REFCOUNTING gstelement.c:3088:gst_element_dispose:<videotestsrc0> parent class dispose
0:00:00.075340952 28239       0xd13e00 INFO         GST_REFCOUNTING gstelement.c:3119:gst_element_finalize:<videotestsrc0> finalize
0:00:00.075357771 28239       0xd13e00 INFO         GST_REFCOUNTING gstelement.c:3130:gst_element_finalize:<videotestsrc0> finalize parent
0:00:00.075374378 28239       0xd13e00 INFO         GST_REFCOUNTING gstelement.c:3064:gst_element_dispose:<pipeline0> dispose
0:00:00.075409376 28239       0xd13e00 INFO         GST_REFCOUNTING gstelement.c:3088:gst_element_dispose:<pipeline0> parent class dispose
0:00:00.075441618 28239       0xd13e00 INFO         GST_REFCOUNTING gstelement.c:3119:gst_element_finalize:<pipeline0> finalize
0:00:00.075470418 28239       0xd13e00 INFO         GST_REFCOUNTING gstelement.c:3130:gst_element_finalize:<pipeline0> finalize parent
0:00:00.075501764 28239       0xd13e00 INFO                GST_INIT gst.c:1023:gst_deinit: deinitializing GStreamer
0:00:00.078065651 28239       0xd13e00 INFO                GST_INIT gst.c:1129:gst_deinit: deinitialized GStreamer
Improve this answer
2
  • Ok, it is intersting but I think it is only part of the answer cause when I plug an xvimagesink, I still need to add that videoconvert element before to play the pipeline whereas capabilities seem to agree.
    – MarAja
    Nov 9, 2015 at 17:35
  • Yes, the point is that it's the vertigotv -> xvimagesink connection that needs the conversion (because raw RGB is actually not the same as RGBx), regardless of whether you're using an xvimagesink directly or via the autovideosink. I've updated my answer to (hopefully) make this more clear.
    – Gabriel Grant
    Nov 10, 2015 at 16:04

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.