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Recording error/failure with parameters.

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Ian Davidson
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Recording error/failure with parameters.

Ian Davidson
I want to record Video from a composite input on a Video Capture card.

I took this example (from the documentation of avimux)
gst-launch-1.0 videotestsrc num-buffers=250 \
! 'video/x-raw,format=(string)I420,width=320,height=240,framerate=(fraction)25/1' \
! queue ! mux. \
audiotestsrc num-buffers=440 ! audioconvert \
! 'audio/x-raw,rate=44100,channels=2' ! queue ! mux. \
avimux name=mux ! filesink location=test.avi


I changed the Test Sources to use what I hoped would be real inputs
[ian@localhost ~]$ gst-launch-1.0 --gst-debug-level=4 v4l2src
'video/x-raw,format=(string)I420,width=320,height=240,framerate=(fraction)25/1'
! queue ! mux. alsasrc ! audioconvert !
'audio/x-raw,rate=44100,channels=2' ! queue ! mux. avimux name=mux !
filesink location=test.avi

I got some errors.  Basically 2 errors reported:
GStreamer-CRITICAL **: gst_element_make_from_uri: assertion
`gst_uri_is_valid (uri)' failed
and
WARNING: erroneous pipeline: no element "video"
although I wouldn't be surprised if one was caused by the other.

I am new to GStreamer - so I turned up the debug level to try to
determine what was actually complaining - but I am still confused. The
debug output is below.

0:00:00.015370304  2795      0x113eb50 INFO      GST_PLUGIN_LOADING
gstplugin.c:828:gst_plugin_load_file: plugin
"/usr/lib64/gstreamer-1.0/libgstvideo4linux2.so" loaded
0:00:00.015398073  2795      0x113eb50 INFO     GST_ELEMENT_FACTORY
gstelementfactory.c:365:gst_element_factory_create: creating element
"v4l2src"
0:00:00.015663674  2795      0x113eb50 INFO        GST_ELEMENT_PADS
gstelement.c:643:gst_element_add_pad:<GstBaseSrc@0x1246050> adding pad 'src'
0:00:00.015817080  2795      0x113eb50 INFO     GST_ELEMENT_FACTORY
gstelementfactory.c:456:gst_element_factory_make: no such element
factory "video"!
0:00:00.015840134  2795      0x113eb50 ERROR           GST_PIPELINE
./grammar.y:670:priv_gst_parse_yyparse: no element "video"
0:00:00.016145952  2795      0x113eb50 INFO      GST_PLUGIN_LOADING
gstplugin.c:828:gst_plugin_load_file: plugin
"/usr/lib64/gstreamer-1.0/libgstcoreelements.so" loaded
0:00:00.016169146  2795      0x113eb50 INFO     GST_ELEMENT_FACTORY
gstelementfactory.c:365:gst_element_factory_create: creating element "queue"
0:00:00.016291104  2795      0x113eb50 INFO        GST_ELEMENT_PADS
gstelement.c:643:gst_element_add_pad:<GstQueue@0x124c000> adding pad 'sink'
0:00:00.016333700  2795      0x113eb50 INFO        GST_ELEMENT_PADS
gstelement.c:643:gst_element_add_pad:<GstQueue@0x124c000> adding pad 'src'
0:00:00.017409059  2795      0x113eb50 INFO      GST_PLUGIN_LOADING
gstplugin.c:828:gst_plugin_load_file: plugin
"/usr/lib64/gstreamer-1.0/libgstalsa.so" loaded
0:00:00.017438263  2795      0x113eb50 INFO     GST_ELEMENT_FACTORY
gstelementfactory.c:365:gst_element_factory_create: creating element
"alsasrc"
0:00:00.017570984  2795      0x113eb50 INFO        GST_ELEMENT_PADS
gstelement.c:643:gst_element_add_pad:<GstBaseSrc@0x1254980> adding pad 'src'
0:00:00.017854208  2795      0x113eb50 INFO      GST_PLUGIN_LOADING
gstplugin.c:828:gst_plugin_load_file: plugin
"/usr/lib64/gstreamer-1.0/libgstaudioconvert.so" loaded
0:00:00.017877752  2795      0x113eb50 INFO     GST_ELEMENT_FACTORY
gstelementfactory.c:365:gst_element_factory_create: creating element
"audioconvert"
0:00:00.017996136  2795      0x113eb50 INFO        GST_ELEMENT_PADS
gstelement.c:643:gst_element_add_pad:<GstBaseTransform@0x1259400> adding
pad 'sink'
0:00:00.018038344  2795      0x113eb50 INFO        GST_ELEMENT_PADS
gstelement.c:643:gst_element_add_pad:<GstBaseTransform@0x1259400> adding
pad 'src'
0:00:00.018071107  2795      0x113eb50 INFO     GST_ELEMENT_FACTORY
gstelementfactory.c:365:gst_element_factory_create: creating element "queue"
0:00:00.018110888  2795      0x113eb50 INFO        GST_ELEMENT_PADS
gstelement.c:643:gst_element_add_pad:<GstQueue@0x124c2e0> adding pad 'sink'
0:00:00.018149838  2795      0x113eb50 INFO        GST_ELEMENT_PADS
gstelement.c:643:gst_element_add_pad:<GstQueue@0x124c2e0> adding pad 'src'
0:00:00.018456110  2795      0x113eb50 INFO      GST_PLUGIN_LOADING
gstplugin.c:828:gst_plugin_load_file: plugin
"/usr/lib64/gstreamer-1.0/libgstavi.so" loaded
0:00:00.018476037  2795      0x113eb50 INFO     GST_ELEMENT_FACTORY
gstelementfactory.c:365:gst_element_factory_create: creating element
"avimux"
0:00:00.018693959  2795      0x113eb50 INFO        GST_ELEMENT_PADS
gstelement.c:643:gst_element_add_pad:<GstAviMux@0x1260060> adding pad 'src'
0:00:00.018755731  2795      0x113eb50 INFO     GST_ELEMENT_FACTORY
gstelementfactory.c:365:gst_element_factory_create: creating element
"filesink"
0:00:00.018839599  2795      0x113eb50 INFO        GST_ELEMENT_PADS
gstelement.c:643:gst_element_add_pad:<GstBaseSink@0x1264000> adding pad
'sink'
0:00:00.018882255  2795      0x113eb50 INFO                filesink
gstfilesink.c:283:gst_file_sink_set_location: filename : test.avi
0:00:00.018898390  2795      0x113eb50 INFO                filesink
gstfilesink.c:284:gst_file_sink_set_location: uri      :
file:///home/ian/test.avi

(gst-launch-1.0:2795): GStreamer-CRITICAL **: gst_element_make_from_uri:
assertion `gst_uri_is_valid (uri)' failed
0:00:00.018950885  2795      0x113eb50 ERROR           GST_PIPELINE
./grammar.y:827:priv_gst_parse_yyparse: no source element for URI
"/x-raw,format=(string)I420,width=320,height=240,framerate=(fraction)25/1"
0:00:00.018973863  2795      0x113eb50 INFO     GST_ELEMENT_FACTORY
gstelementfactory.c:365:gst_element_factory_create: creating element
"pipeline"
0:00:00.019182262  2795      0x113eb50 INFO            GST_PIPELINE
./grammar.y:577:gst_parse_perform_link: linking v4l2src0:(any) to
queue0:(any) (0/0) with caps "(NULL)"
0:00:00.019205992  2795      0x113eb50 INFO        GST_ELEMENT_PADS
gstutils.c:1543:gst_element_link_pads_full: trying to link element
v4l2src0:(any) to element queue0:(any)
0:00:00.019226359  2795      0x113eb50 INFO                GST_PADS
gstutils.c:936:gst_pad_check_link: trying to link v4l2src0:src and
queue0:sink
0:00:00.019263600  2795      0x113eb50 INFO                GST_PADS
gstpad.c:3582:gst_pad_peer_query:<queue0:src> pad has no peer
0:00:00.019285110  2795      0x113eb50 INFO                GST_PADS
gstutils.c:1443:prepare_link_maybe_ghosting: v4l2src0 and queue0 in same
bin, no need for ghost pads
0:00:00.019311370  2795      0x113eb50 INFO                GST_PADS
gstpad.c:2061:gst_pad_link_prepare: trying to link v4l2src0:src and
queue0:sink
0:00:00.019336237  2795      0x113eb50 INFO                GST_PADS
gstpad.c:3582:gst_pad_peer_query:<queue0:src> pad has no peer
0:00:00.019354793  2795      0x113eb50 INFO                GST_PADS
gstpad.c:2263:gst_pad_link_full: linked v4l2src0:src and queue0:sink,
successful
0:00:00.019370486  2795      0x113eb50 INFO               GST_EVENT
gstevent.c:1313:gst_event_new_reconfigure: creating reconfigure event
0:00:00.019388320  2795      0x113eb50 INFO               GST_EVENT
gstpad.c:4873:gst_pad_send_event_unchecked:<v4l2src0:src> Received event
on flushing pad. Discarding
0:00:00.019409854  2795      0x113eb50 INFO           GST_PARENTAGE
gstbin.c:3903:gst_bin_get_by_name: [pipeline0]: looking up child element mux
0:00:00.019431346  2795      0x113eb50 INFO            GST_PIPELINE
./grammar.y:577:gst_parse_perform_link: linking queue0:(any) to mux:mux
(0/0) with caps "(NULL)"
0:00:00.019448546  2795      0x113eb50 INFO        GST_ELEMENT_PADS
gstutils.c:1543:gst_element_link_pads_full: trying to link element
queue0:(any) to element mux:(any)
0:00:00.019512663  2795      0x113eb50 INFO        GST_ELEMENT_PADS
gstelement.c:643:gst_element_add_pad:<mux> adding pad 'video_0'
0:00:00.019534628  2795      0x113eb50 INFO                GST_PADS
gstutils.c:1443:prepare_link_maybe_ghosting: queue0 and mux in same bin,
no need for ghost pads
0:00:00.019554580  2795      0x113eb50 INFO                GST_PADS
gstpad.c:2061:gst_pad_link_prepare: trying to link queue0:src and
mux:video_0
0:00:00.019586407  2795      0x113eb50 INFO                GST_PADS
gstpad.c:2263:gst_pad_link_full: linked queue0:src and mux:video_0,
successful
0:00:00.019602683  2795      0x113eb50 INFO               GST_EVENT
gstevent.c:1313:gst_event_new_reconfigure: creating reconfigure event
0:00:00.019618096  2795      0x113eb50 INFO               GST_EVENT
gstpad.c:4873:gst_pad_send_event_unchecked:<queue0:src> Received event
on flushing pad. Discarding
0:00:00.019637891  2795      0x113eb50 INFO            GST_PIPELINE
./grammar.y:577:gst_parse_perform_link: linking alsasrc0:(any) to
audioconvert0:(any) (0/0) with caps "(NULL)"
0:00:00.019655184  2795      0x113eb50 INFO        GST_ELEMENT_PADS
gstutils.c:1543:gst_element_link_pads_full: trying to link element
alsasrc0:(any) to element audioconvert0:(any)
0:00:00.019672525  2795      0x113eb50 INFO                GST_PADS
gstutils.c:936:gst_pad_check_link: trying to link alsasrc0:src and
audioconvert0:sink
0:00:00.019699128  2795      0x113eb50 INFO                GST_PADS
gstpad.c:3582:gst_pad_peer_query:<audioconvert0:src> pad has no peer
0:00:00.019729475  2795      0x113eb50 INFO                 default
gststructure.c:2792:gst_structure_get_valist: Expected field
'channel-mask' in structure: audio/x-raw, rate=(int)[ 1, 2147483647 ],
channels=(int)[ 1, 2147483647 ], layout=(string)interleaved;
0:00:00.019786446  2795      0x113eb50 INFO                GST_PADS
gstutils.c:1443:prepare_link_maybe_ghosting: alsasrc0 and audioconvert0
in same bin, no need for ghost pads
0:00:00.019807842  2795      0x113eb50 INFO                GST_PADS
gstpad.c:2061:gst_pad_link_prepare: trying to link alsasrc0:src and
audioconvert0:sink
0:00:00.019830044  2795      0x113eb50 INFO                GST_PADS
gstpad.c:3582:gst_pad_peer_query:<audioconvert0:src> pad has no peer
0:00:00.019855723  2795      0x113eb50 INFO                 default
gststructure.c:2792:gst_structure_get_valist: Expected field
'channel-mask' in structure: audio/x-raw, rate=(int)[ 1, 2147483647 ],
channels=(int)[ 1, 2147483647 ], layout=(string)interleaved;
0:00:00.019904617  2795      0x113eb50 INFO                GST_PADS
gstpad.c:2263:gst_pad_link_full: linked alsasrc0:src and
audioconvert0:sink, successful
0:00:00.019921140  2795      0x113eb50 INFO               GST_EVENT
gstevent.c:1313:gst_event_new_reconfigure: creating reconfigure event
0:00:00.019936935  2795      0x113eb50 INFO               GST_EVENT
gstpad.c:4873:gst_pad_send_event_unchecked:<alsasrc0:src> Received event
on flushing pad. Discarding
0:00:00.019957043  2795      0x113eb50 INFO            GST_PIPELINE
./grammar.y:577:gst_parse_perform_link: linking audioconvert0:(any) to
queue1:(any) (0/0) with caps "audio/x-raw, rate=(int)44100, channels=(int)2"
0:00:00.019981634  2795      0x113eb50 INFO     GST_ELEMENT_FACTORY
gstelementfactory.c:365:gst_element_factory_create: creating element
"capsfilter"
0:00:00.020052198  2795      0x113eb50 INFO        GST_ELEMENT_PADS
gstelement.c:643:gst_element_add_pad:<GstBaseTransform@0x1268030> adding
pad 'sink'
0:00:00.020089236  2795      0x113eb50 INFO        GST_ELEMENT_PADS
gstelement.c:643:gst_element_add_pad:<GstBaseTransform@0x1268030> adding
pad 'src'
0:00:00.020114647  2795      0x113eb50 INFO              GST_STATES
gstbin.c:1804:gst_bin_get_state_func:<pipeline0> getting state
0:00:00.020139733  2795      0x113eb50 INFO              GST_STATES
gstelement.c:2321:gst_element_continue_state:<capsfilter0> completed
state change to NULL
0:00:00.020159303  2795      0x113eb50 INFO               GST_EVENT
gstevent.c:1313:gst_event_new_reconfigure: creating reconfigure event
0:00:00.036244228  2795      0x113eb50 INFO        GST_ELEMENT_PADS
gstutils.c:1543:gst_element_link_pads_full: trying to link element
audioconvert0:(any) to element capsfilter0:sink
0:00:00.036298459  2795      0x113eb50 INFO        GST_ELEMENT_PADS
gstelement.c:894:gst_element_get_static_pad: found pad capsfilter0:sink
0:00:00.036322072  2795      0x113eb50 INFO                GST_PADS
gstutils.c:1443:prepare_link_maybe_ghosting: audioconvert0 and
capsfilter0 in same bin, no need for ghost pads
0:00:00.036355602  2795      0x113eb50 INFO                GST_PADS
gstpad.c:2061:gst_pad_link_prepare: trying to link audioconvert0:src and
capsfilter0:sink
0:00:00.036624322  2795      0x113eb50 INFO                 default
gststructure.c:2792:gst_structure_get_valist: Expected field
'channel-mask' in structure: audio/x-raw, layout=(string)interleaved,
rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ];
0:00:00.036882520  2795      0x113eb50 INFO                GST_PADS
gstpad.c:3582:gst_pad_peer_query:<capsfilter0:src> pad has no peer
0:00:00.036915544  2795      0x113eb50 INFO                GST_PADS
gstpad.c:2263:gst_pad_link_full: linked audioconvert0:src and
capsfilter0:sink, successful
0:00:00.036938327  2795      0x113eb50 INFO               GST_EVENT
gstevent.c:1313:gst_event_new_reconfigure: creating reconfigure event
0:00:00.036961088  2795      0x113eb50 INFO               GST_EVENT
gstpad.c:4873:gst_pad_send_event_unchecked:<audioconvert0:src> Received
event on flushing pad. Discarding
0:00:00.036989985  2795      0x113eb50 INFO        GST_ELEMENT_PADS
gstutils.c:1543:gst_element_link_pads_full: trying to link element
capsfilter0:src to element queue1:(any)
0:00:00.037013222  2795      0x113eb50 INFO        GST_ELEMENT_PADS
gstelement.c:894:gst_element_get_static_pad: found pad capsfilter0:src
0:00:00.037047221  2795      0x113eb50 INFO                GST_PADS
gstutils.c:936:gst_pad_check_link: trying to link capsfilter0:src and
queue1:sink
0:00:00.037273369  2795      0x113eb50 INFO                 default
gststructure.c:2792:gst_structure_get_valist: Expected field
'channel-mask' in structure: audio/x-raw, layout=(string)interleaved,
rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ];
0:00:00.037533944  2795      0x113eb50 INFO                GST_PADS
gstpad.c:3582:gst_pad_peer_query:<queue1:src> pad has no peer
0:00:00.037562258  2795      0x113eb50 INFO                GST_PADS
gstutils.c:1443:prepare_link_maybe_ghosting: capsfilter0 and queue1 in
same bin, no need for ghost pads
0:00:00.037590094  2795      0x113eb50 INFO                GST_PADS
gstpad.c:2061:gst_pad_link_prepare: trying to link capsfilter0:src and
queue1:sink
0:00:00.037816895  2795      0x113eb50 INFO                 default
gststructure.c:2792:gst_structure_get_valist: Expected field
'channel-mask' in structure: audio/x-raw, layout=(string)interleaved,
rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ];
0:00:00.038086325  2795      0x113eb50 INFO                GST_PADS
gstpad.c:3582:gst_pad_peer_query:<queue1:src> pad has no peer
0:00:00.038115054  2795      0x113eb50 INFO                GST_PADS
gstpad.c:2263:gst_pad_link_full: linked capsfilter0:src and queue1:sink,
successful
0:00:00.038137163  2795      0x113eb50 INFO               GST_EVENT
gstevent.c:1313:gst_event_new_reconfigure: creating reconfigure event
0:00:00.038158805  2795      0x113eb50 INFO               GST_EVENT
gstpad.c:4873:gst_pad_send_event_unchecked:<capsfilter0:src> Received
event on flushing pad. Discarding
0:00:00.038188810  2795      0x113eb50 INFO           GST_PARENTAGE
gstbin.c:3903:gst_bin_get_by_name: [pipeline0]: looking up child element mux
0:00:00.038219410  2795      0x113eb50 INFO            GST_PIPELINE
./grammar.y:577:gst_parse_perform_link: linking queue1:(any) to mux:mux
(0/0) with caps "(NULL)"
0:00:00.038242791  2795      0x113eb50 INFO        GST_ELEMENT_PADS
gstutils.c:1543:gst_element_link_pads_full: trying to link element
queue1:(any) to element mux:(any)
0:00:00.038469282  2795      0x113eb50 INFO                 default
gststructure.c:2792:gst_structure_get_valist: Expected field
'channel-mask' in structure: audio/x-raw, layout=(string)interleaved,
rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ];
0:00:00.038781885  2795      0x113eb50 INFO        GST_ELEMENT_PADS
gstelement.c:643:gst_element_add_pad:<mux> adding pad 'audio_0'
0:00:00.038812675  2795      0x113eb50 INFO                GST_PADS
gstutils.c:1443:prepare_link_maybe_ghosting: queue1 and mux in same bin,
no need for ghost pads
0:00:00.038839608  2795      0x113eb50 INFO                GST_PADS
gstpad.c:2061:gst_pad_link_prepare: trying to link queue1:src and
mux:audio_0
0:00:00.039070895  2795      0x113eb50 INFO                 default
gststructure.c:2792:gst_structure_get_valist: Expected field
'channel-mask' in structure: audio/x-raw, layout=(string)interleaved,
rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ];
0:00:00.039337982  2795      0x113eb50 INFO                GST_PADS
gstpad.c:2263:gst_pad_link_full: linked queue1:src and mux:audio_0,
successful
0:00:00.039360963  2795      0x113eb50 INFO               GST_EVENT
gstevent.c:1313:gst_event_new_reconfigure: creating reconfigure event
0:00:00.039381856  2795      0x113eb50 INFO               GST_EVENT
gstpad.c:4873:gst_pad_send_event_unchecked:<queue1:src> Received event
on flushing pad. Discarding
0:00:00.039408729  2795      0x113eb50 INFO            GST_PIPELINE
./grammar.y:577:gst_parse_perform_link: linking mux:(any) to
filesink0:(any) (0/0) with caps "(NULL)"
0:00:00.039431936  2795      0x113eb50 INFO        GST_ELEMENT_PADS
gstutils.c:1543:gst_element_link_pads_full: trying to link element
mux:(any) to element filesink0:(any)
0:00:00.039455518  2795      0x113eb50 INFO                GST_PADS
gstutils.c:936:gst_pad_check_link: trying to link mux:src and filesink0:sink
0:00:00.039485267  2795      0x113eb50 INFO                GST_PADS
gstutils.c:1443:prepare_link_maybe_ghosting: mux and filesink0 in same
bin, no need for ghost pads
0:00:00.039511070  2795      0x113eb50 INFO                GST_PADS
gstpad.c:2061:gst_pad_link_prepare: trying to link mux:src and
filesink0:sink
0:00:00.039538896  2795      0x113eb50 INFO                GST_PADS
gstpad.c:2263:gst_pad_link_full: linked mux:src and filesink0:sink,
successful
0:00:00.039559781  2795      0x113eb50 INFO               GST_EVENT
gstevent.c:1313:gst_event_new_reconfigure: creating reconfigure event
0:00:00.039580361  2795      0x113eb50 INFO               GST_EVENT
gstpad.c:4873:gst_pad_send_event_unchecked:<mux:src> Received event on
flushing pad. Discarding
WARNING: erroneous pipeline: no element "video"
--
--
Ian Davidson
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Tim-Philipp Müller-2
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Re: Recording error/failure with parameters.

Tim-Philipp Müller-2
On Tue, 2012-11-27 at 22:48 +0000, Ian Davidson wrote:

Hi,

> I changed the Test Sources to use what I hoped would be real inputs
> [ian@localhost ~]$ gst-launch-1.0 --gst-debug-level=4 v4l2src
> 'video/x-raw,format=(string)I420,width=320,height=240,framerate=(fraction)25/1'
> ! queue ! mux. alsasrc ! audioconvert !
> 'audio/x-raw,rate=44100,channels=2' ! queue ! mux. avimux name=mux !
> filesink location=test.avi

You seem to be missing a ! between v4l2src and the filter caps here.

Cheers
 -Tim

> I got some errors.  Basically 2 errors reported:
> GStreamer-CRITICAL **: gst_element_make_from_uri: assertion
> `gst_uri_is_valid (uri)' failed
> and
> WARNING: erroneous pipeline: no element "video"
> although I wouldn't be surprised if one was caused by the other.
>
> I am new to GStreamer - so I turned up the debug level to try to
> determine what was actually complaining - but I am still confused. The
> debug output is below.
>
> 0:00:00.015370304  2795      0x113eb50 INFO      GST_PLUGIN_LOADING
> gstplugin.c:828:gst_plugin_load_file: plugin
> "/usr/lib64/gstreamer-1.0/libgstvideo4linux2.so" loaded
> 0:00:00.015398073  2795      0x113eb50 INFO     GST_ELEMENT_FACTORY
> gstelementfactory.c:365:gst_element_factory_create: creating element
> "v4l2src"
> 0:00:00.015663674  2795      0x113eb50 INFO        GST_ELEMENT_PADS
> gstelement.c:643:gst_element_add_pad:<GstBaseSrc@0x1246050> adding pad 'src'
> 0:00:00.015817080  2795      0x113eb50 INFO     GST_ELEMENT_FACTORY
> gstelementfactory.c:456:gst_element_factory_make: no such element
> factory "video"!
> 0:00:00.015840134  2795      0x113eb50 ERROR           GST_PIPELINE
> ./grammar.y:670:priv_gst_parse_yyparse: no element "video"
> 0:00:00.016145952  2795      0x113eb50 INFO      GST_PLUGIN_LOADING
> gstplugin.c:828:gst_plugin_load_file: plugin
> "/usr/lib64/gstreamer-1.0/libgstcoreelements.so" loaded
> 0:00:00.016169146  2795      0x113eb50 INFO     GST_ELEMENT_FACTORY
> gstelementfactory.c:365:gst_element_factory_create: creating element "queue"
> 0:00:00.016291104  2795      0x113eb50 INFO        GST_ELEMENT_PADS
> gstelement.c:643:gst_element_add_pad:<GstQueue@0x124c000> adding pad 'sink'
> 0:00:00.016333700  2795      0x113eb50 INFO        GST_ELEMENT_PADS
> gstelement.c:643:gst_element_add_pad:<GstQueue@0x124c000> adding pad 'src'
> 0:00:00.017409059  2795      0x113eb50 INFO      GST_PLUGIN_LOADING
> gstplugin.c:828:gst_plugin_load_file: plugin
> "/usr/lib64/gstreamer-1.0/libgstalsa.so" loaded
> 0:00:00.017438263  2795      0x113eb50 INFO     GST_ELEMENT_FACTORY
> gstelementfactory.c:365:gst_element_factory_create: creating element
> "alsasrc"
> 0:00:00.017570984  2795      0x113eb50 INFO        GST_ELEMENT_PADS
> gstelement.c:643:gst_element_add_pad:<GstBaseSrc@0x1254980> adding pad 'src'
> 0:00:00.017854208  2795      0x113eb50 INFO      GST_PLUGIN_LOADING
> gstplugin.c:828:gst_plugin_load_file: plugin
> "/usr/lib64/gstreamer-1.0/libgstaudioconvert.so" loaded
> 0:00:00.017877752  2795      0x113eb50 INFO     GST_ELEMENT_FACTORY
> gstelementfactory.c:365:gst_element_factory_create: creating element
> "audioconvert"
> 0:00:00.017996136  2795      0x113eb50 INFO        GST_ELEMENT_PADS
> gstelement.c:643:gst_element_add_pad:<GstBaseTransform@0x1259400> adding
> pad 'sink'
> 0:00:00.018038344  2795      0x113eb50 INFO        GST_ELEMENT_PADS
> gstelement.c:643:gst_element_add_pad:<GstBaseTransform@0x1259400> adding
> pad 'src'
> 0:00:00.018071107  2795      0x113eb50 INFO     GST_ELEMENT_FACTORY
> gstelementfactory.c:365:gst_element_factory_create: creating element "queue"
> 0:00:00.018110888  2795      0x113eb50 INFO        GST_ELEMENT_PADS
> gstelement.c:643:gst_element_add_pad:<GstQueue@0x124c2e0> adding pad 'sink'
> 0:00:00.018149838  2795      0x113eb50 INFO        GST_ELEMENT_PADS
> gstelement.c:643:gst_element_add_pad:<GstQueue@0x124c2e0> adding pad 'src'
> 0:00:00.018456110  2795      0x113eb50 INFO      GST_PLUGIN_LOADING
> gstplugin.c:828:gst_plugin_load_file: plugin
> "/usr/lib64/gstreamer-1.0/libgstavi.so" loaded
> 0:00:00.018476037  2795      0x113eb50 INFO     GST_ELEMENT_FACTORY
> gstelementfactory.c:365:gst_element_factory_create: creating element
> "avimux"
> 0:00:00.018693959  2795      0x113eb50 INFO        GST_ELEMENT_PADS
> gstelement.c:643:gst_element_add_pad:<GstAviMux@0x1260060> adding pad 'src'
> 0:00:00.018755731  2795      0x113eb50 INFO     GST_ELEMENT_FACTORY
> gstelementfactory.c:365:gst_element_factory_create: creating element
> "filesink"
> 0:00:00.018839599  2795      0x113eb50 INFO        GST_ELEMENT_PADS
> gstelement.c:643:gst_element_add_pad:<GstBaseSink@0x1264000> adding pad
> 'sink'
> 0:00:00.018882255  2795      0x113eb50 INFO                filesink
> gstfilesink.c:283:gst_file_sink_set_location: filename : test.avi
> 0:00:00.018898390  2795      0x113eb50 INFO                filesink
> gstfilesink.c:284:gst_file_sink_set_location: uri      :
> file:///home/ian/test.avi
>
> (gst-launch-1.0:2795): GStreamer-CRITICAL **: gst_element_make_from_uri:
> assertion `gst_uri_is_valid (uri)' failed
> 0:00:00.018950885  2795      0x113eb50 ERROR           GST_PIPELINE
> ./grammar.y:827:priv_gst_parse_yyparse: no source element for URI
> "/x-raw,format=(string)I420,width=320,height=240,framerate=(fraction)25/1"
> 0:00:00.018973863  2795      0x113eb50 INFO     GST_ELEMENT_FACTORY
> gstelementfactory.c:365:gst_element_factory_create: creating element
> "pipeline"
> 0:00:00.019182262  2795      0x113eb50 INFO            GST_PIPELINE
> ./grammar.y:577:gst_parse_perform_link: linking v4l2src0:(any) to
> queue0:(any) (0/0) with caps "(NULL)"
> 0:00:00.019205992  2795      0x113eb50 INFO        GST_ELEMENT_PADS
> gstutils.c:1543:gst_element_link_pads_full: trying to link element
> v4l2src0:(any) to element queue0:(any)
> 0:00:00.019226359  2795      0x113eb50 INFO                GST_PADS
> gstutils.c:936:gst_pad_check_link: trying to link v4l2src0:src and
> queue0:sink
> 0:00:00.019263600  2795      0x113eb50 INFO                GST_PADS
> gstpad.c:3582:gst_pad_peer_query:<queue0:src> pad has no peer
> 0:00:00.019285110  2795      0x113eb50 INFO                GST_PADS
> gstutils.c:1443:prepare_link_maybe_ghosting: v4l2src0 and queue0 in same
> bin, no need for ghost pads
> 0:00:00.019311370  2795      0x113eb50 INFO                GST_PADS
> gstpad.c:2061:gst_pad_link_prepare: trying to link v4l2src0:src and
> queue0:sink
> 0:00:00.019336237  2795      0x113eb50 INFO                GST_PADS
> gstpad.c:3582:gst_pad_peer_query:<queue0:src> pad has no peer
> 0:00:00.019354793  2795      0x113eb50 INFO                GST_PADS
> gstpad.c:2263:gst_pad_link_full: linked v4l2src0:src and queue0:sink,
> successful
> 0:00:00.019370486  2795      0x113eb50 INFO               GST_EVENT
> gstevent.c:1313:gst_event_new_reconfigure: creating reconfigure event
> 0:00:00.019388320  2795      0x113eb50 INFO               GST_EVENT
> gstpad.c:4873:gst_pad_send_event_unchecked:<v4l2src0:src> Received event
> on flushing pad. Discarding
> 0:00:00.019409854  2795      0x113eb50 INFO           GST_PARENTAGE
> gstbin.c:3903:gst_bin_get_by_name: [pipeline0]: looking up child element mux
> 0:00:00.019431346  2795      0x113eb50 INFO            GST_PIPELINE
> ./grammar.y:577:gst_parse_perform_link: linking queue0:(any) to mux:mux
> (0/0) with caps "(NULL)"
> 0:00:00.019448546  2795      0x113eb50 INFO        GST_ELEMENT_PADS
> gstutils.c:1543:gst_element_link_pads_full: trying to link element
> queue0:(any) to element mux:(any)
> 0:00:00.019512663  2795      0x113eb50 INFO        GST_ELEMENT_PADS
> gstelement.c:643:gst_element_add_pad:<mux> adding pad 'video_0'
> 0:00:00.019534628  2795      0x113eb50 INFO                GST_PADS
> gstutils.c:1443:prepare_link_maybe_ghosting: queue0 and mux in same bin,
> no need for ghost pads
> 0:00:00.019554580  2795      0x113eb50 INFO                GST_PADS
> gstpad.c:2061:gst_pad_link_prepare: trying to link queue0:src and
> mux:video_0
> 0:00:00.019586407  2795      0x113eb50 INFO                GST_PADS
> gstpad.c:2263:gst_pad_link_full: linked queue0:src and mux:video_0,
> successful
> 0:00:00.019602683  2795      0x113eb50 INFO               GST_EVENT
> gstevent.c:1313:gst_event_new_reconfigure: creating reconfigure event
> 0:00:00.019618096  2795      0x113eb50 INFO               GST_EVENT
> gstpad.c:4873:gst_pad_send_event_unchecked:<queue0:src> Received event
> on flushing pad. Discarding
> 0:00:00.019637891  2795      0x113eb50 INFO            GST_PIPELINE
> ./grammar.y:577:gst_parse_perform_link: linking alsasrc0:(any) to
> audioconvert0:(any) (0/0) with caps "(NULL)"
> 0:00:00.019655184  2795      0x113eb50 INFO        GST_ELEMENT_PADS
> gstutils.c:1543:gst_element_link_pads_full: trying to link element
> alsasrc0:(any) to element audioconvert0:(any)
> 0:00:00.019672525  2795      0x113eb50 INFO                GST_PADS
> gstutils.c:936:gst_pad_check_link: trying to link alsasrc0:src and
> audioconvert0:sink
> 0:00:00.019699128  2795      0x113eb50 INFO                GST_PADS
> gstpad.c:3582:gst_pad_peer_query:<audioconvert0:src> pad has no peer
> 0:00:00.019729475  2795      0x113eb50 INFO                 default
> gststructure.c:2792:gst_structure_get_valist: Expected field
> 'channel-mask' in structure: audio/x-raw, rate=(int)[ 1, 2147483647 ],
> channels=(int)[ 1, 2147483647 ], layout=(string)interleaved;
> 0:00:00.019786446  2795      0x113eb50 INFO                GST_PADS
> gstutils.c:1443:prepare_link_maybe_ghosting: alsasrc0 and audioconvert0
> in same bin, no need for ghost pads
> 0:00:00.019807842  2795      0x113eb50 INFO                GST_PADS
> gstpad.c:2061:gst_pad_link_prepare: trying to link alsasrc0:src and
> audioconvert0:sink
> 0:00:00.019830044  2795      0x113eb50 INFO                GST_PADS
> gstpad.c:3582:gst_pad_peer_query:<audioconvert0:src> pad has no peer
> 0:00:00.019855723  2795      0x113eb50 INFO                 default
> gststructure.c:2792:gst_structure_get_valist: Expected field
> 'channel-mask' in structure: audio/x-raw, rate=(int)[ 1, 2147483647 ],
> channels=(int)[ 1, 2147483647 ], layout=(string)interleaved;
> 0:00:00.019904617  2795      0x113eb50 INFO                GST_PADS
> gstpad.c:2263:gst_pad_link_full: linked alsasrc0:src and
> audioconvert0:sink, successful
> 0:00:00.019921140  2795      0x113eb50 INFO               GST_EVENT
> gstevent.c:1313:gst_event_new_reconfigure: creating reconfigure event
> 0:00:00.019936935  2795      0x113eb50 INFO               GST_EVENT
> gstpad.c:4873:gst_pad_send_event_unchecked:<alsasrc0:src> Received event
> on flushing pad. Discarding
> 0:00:00.019957043  2795      0x113eb50 INFO            GST_PIPELINE
> ./grammar.y:577:gst_parse_perform_link: linking audioconvert0:(any) to
> queue1:(any) (0/0) with caps "audio/x-raw, rate=(int)44100, channels=(int)2"
> 0:00:00.019981634  2795      0x113eb50 INFO     GST_ELEMENT_FACTORY
> gstelementfactory.c:365:gst_element_factory_create: creating element
> "capsfilter"
> 0:00:00.020052198  2795      0x113eb50 INFO        GST_ELEMENT_PADS
> gstelement.c:643:gst_element_add_pad:<GstBaseTransform@0x1268030> adding
> pad 'sink'
> 0:00:00.020089236  2795      0x113eb50 INFO        GST_ELEMENT_PADS
> gstelement.c:643:gst_element_add_pad:<GstBaseTransform@0x1268030> adding
> pad 'src'
> 0:00:00.020114647  2795      0x113eb50 INFO              GST_STATES
> gstbin.c:1804:gst_bin_get_state_func:<pipeline0> getting state
> 0:00:00.020139733  2795      0x113eb50 INFO              GST_STATES
> gstelement.c:2321:gst_element_continue_state:<capsfilter0> completed
> state change to NULL
> 0:00:00.020159303  2795      0x113eb50 INFO               GST_EVENT
> gstevent.c:1313:gst_event_new_reconfigure: creating reconfigure event
> 0:00:00.036244228  2795      0x113eb50 INFO        GST_ELEMENT_PADS
> gstutils.c:1543:gst_element_link_pads_full: trying to link element
> audioconvert0:(any) to element capsfilter0:sink
> 0:00:00.036298459  2795      0x113eb50 INFO        GST_ELEMENT_PADS
> gstelement.c:894:gst_element_get_static_pad: found pad capsfilter0:sink
> 0:00:00.036322072  2795      0x113eb50 INFO                GST_PADS
> gstutils.c:1443:prepare_link_maybe_ghosting: audioconvert0 and
> capsfilter0 in same bin, no need for ghost pads
> 0:00:00.036355602  2795      0x113eb50 INFO                GST_PADS
> gstpad.c:2061:gst_pad_link_prepare: trying to link audioconvert0:src and
> capsfilter0:sink
> 0:00:00.036624322  2795      0x113eb50 INFO                 default
> gststructure.c:2792:gst_structure_get_valist: Expected field
> 'channel-mask' in structure: audio/x-raw, layout=(string)interleaved,
> rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ];
> 0:00:00.036882520  2795      0x113eb50 INFO                GST_PADS
> gstpad.c:3582:gst_pad_peer_query:<capsfilter0:src> pad has no peer
> 0:00:00.036915544  2795      0x113eb50 INFO                GST_PADS
> gstpad.c:2263:gst_pad_link_full: linked audioconvert0:src and
> capsfilter0:sink, successful
> 0:00:00.036938327  2795      0x113eb50 INFO               GST_EVENT
> gstevent.c:1313:gst_event_new_reconfigure: creating reconfigure event
> 0:00:00.036961088  2795      0x113eb50 INFO               GST_EVENT
> gstpad.c:4873:gst_pad_send_event_unchecked:<audioconvert0:src> Received
> event on flushing pad. Discarding
> 0:00:00.036989985  2795      0x113eb50 INFO        GST_ELEMENT_PADS
> gstutils.c:1543:gst_element_link_pads_full: trying to link element
> capsfilter0:src to element queue1:(any)
> 0:00:00.037013222  2795      0x113eb50 INFO        GST_ELEMENT_PADS
> gstelement.c:894:gst_element_get_static_pad: found pad capsfilter0:src
> 0:00:00.037047221  2795      0x113eb50 INFO                GST_PADS
> gstutils.c:936:gst_pad_check_link: trying to link capsfilter0:src and
> queue1:sink
> 0:00:00.037273369  2795      0x113eb50 INFO                 default
> gststructure.c:2792:gst_structure_get_valist: Expected field
> 'channel-mask' in structure: audio/x-raw, layout=(string)interleaved,
> rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ];
> 0:00:00.037533944  2795      0x113eb50 INFO                GST_PADS
> gstpad.c:3582:gst_pad_peer_query:<queue1:src> pad has no peer
> 0:00:00.037562258  2795      0x113eb50 INFO                GST_PADS
> gstutils.c:1443:prepare_link_maybe_ghosting: capsfilter0 and queue1 in
> same bin, no need for ghost pads
> 0:00:00.037590094  2795      0x113eb50 INFO                GST_PADS
> gstpad.c:2061:gst_pad_link_prepare: trying to link capsfilter0:src and
> queue1:sink
> 0:00:00.037816895  2795      0x113eb50 INFO                 default
> gststructure.c:2792:gst_structure_get_valist: Expected field
> 'channel-mask' in structure: audio/x-raw, layout=(string)interleaved,
> rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ];
> 0:00:00.038086325  2795      0x113eb50 INFO                GST_PADS
> gstpad.c:3582:gst_pad_peer_query:<queue1:src> pad has no peer
> 0:00:00.038115054  2795      0x113eb50 INFO                GST_PADS
> gstpad.c:2263:gst_pad_link_full: linked capsfilter0:src and queue1:sink,
> successful
> 0:00:00.038137163  2795      0x113eb50 INFO               GST_EVENT
> gstevent.c:1313:gst_event_new_reconfigure: creating reconfigure event
> 0:00:00.038158805  2795      0x113eb50 INFO               GST_EVENT
> gstpad.c:4873:gst_pad_send_event_unchecked:<capsfilter0:src> Received
> event on flushing pad. Discarding
> 0:00:00.038188810  2795      0x113eb50 INFO           GST_PARENTAGE
> gstbin.c:3903:gst_bin_get_by_name: [pipeline0]: looking up child element mux
> 0:00:00.038219410  2795      0x113eb50 INFO            GST_PIPELINE
> ./grammar.y:577:gst_parse_perform_link: linking queue1:(any) to mux:mux
> (0/0) with caps "(NULL)"
> 0:00:00.038242791  2795      0x113eb50 INFO        GST_ELEMENT_PADS
> gstutils.c:1543:gst_element_link_pads_full: trying to link element
> queue1:(any) to element mux:(any)
> 0:00:00.038469282  2795      0x113eb50 INFO                 default
> gststructure.c:2792:gst_structure_get_valist: Expected field
> 'channel-mask' in structure: audio/x-raw, layout=(string)interleaved,
> rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ];
> 0:00:00.038781885  2795      0x113eb50 INFO        GST_ELEMENT_PADS
> gstelement.c:643:gst_element_add_pad:<mux> adding pad 'audio_0'
> 0:00:00.038812675  2795      0x113eb50 INFO                GST_PADS
> gstutils.c:1443:prepare_link_maybe_ghosting: queue1 and mux in same bin,
> no need for ghost pads
> 0:00:00.038839608  2795      0x113eb50 INFO                GST_PADS
> gstpad.c:2061:gst_pad_link_prepare: trying to link queue1:src and
> mux:audio_0
> 0:00:00.039070895  2795      0x113eb50 INFO                 default
> gststructure.c:2792:gst_structure_get_valist: Expected field
> 'channel-mask' in structure: audio/x-raw, layout=(string)interleaved,
> rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ];
> 0:00:00.039337982  2795      0x113eb50 INFO                GST_PADS
> gstpad.c:2263:gst_pad_link_full: linked queue1:src and mux:audio_0,
> successful
> 0:00:00.039360963  2795      0x113eb50 INFO               GST_EVENT
> gstevent.c:1313:gst_event_new_reconfigure: creating reconfigure event
> 0:00:00.039381856  2795      0x113eb50 INFO               GST_EVENT
> gstpad.c:4873:gst_pad_send_event_unchecked:<queue1:src> Received event
> on flushing pad. Discarding
> 0:00:00.039408729  2795      0x113eb50 INFO            GST_PIPELINE
> ./grammar.y:577:gst_parse_perform_link: linking mux:(any) to
> filesink0:(any) (0/0) with caps "(NULL)"
> 0:00:00.039431936  2795      0x113eb50 INFO        GST_ELEMENT_PADS
> gstutils.c:1543:gst_element_link_pads_full: trying to link element
> mux:(any) to element filesink0:(any)
> 0:00:00.039455518  2795      0x113eb50 INFO                GST_PADS
> gstutils.c:936:gst_pad_check_link: trying to link mux:src and filesink0:sink
> 0:00:00.039485267  2795      0x113eb50 INFO                GST_PADS
> gstutils.c:1443:prepare_link_maybe_ghosting: mux and filesink0 in same
> bin, no need for ghost pads
> 0:00:00.039511070  2795      0x113eb50 INFO                GST_PADS
> gstpad.c:2061:gst_pad_link_prepare: trying to link mux:src and
> filesink0:sink
> 0:00:00.039538896  2795      0x113eb50 INFO                GST_PADS
> gstpad.c:2263:gst_pad_link_full: linked mux:src and filesink0:sink,
> successful
> 0:00:00.039559781  2795      0x113eb50 INFO               GST_EVENT
> gstevent.c:1313:gst_event_new_reconfigure: creating reconfigure event
> 0:00:00.039580361  2795      0x113eb50 INFO               GST_EVENT
> gstpad.c:4873:gst_pad_send_event_unchecked:<mux:src> Received event on
> flushing pad. Discarding
> WARNING: erroneous pipeline: no element "video"


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Ian Davidson
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Re: Recording error/failure with parameters.

Ian Davidson
Thanks Tim, I have now got a command which is syntactically correct.

May I make a comment about the GStreamer Documentation?


On the GStreamer web site it says “Application Development Manual (Read this first) ” - so that would seem to be the place to start if you want to learn about Gstreamer.

Very early in the document (section 2.1), it says that “The programmer can use an extensive set of powerful tools to create media pipelines without writing a single line of code. ” That is good to know and is brought about by the library of 'Plug-ins'.

But – then as you continue to read the manual, you are thrown heavily into programming. Straight away.


Might I suggest that very early on you have mention of gst-launch – since, using that you can do things without having to write a single line of coding. However, the chapter on gst-launch itself is not an easy-to-read chapter: It starts with a 'simple commandline' and then shows a more complex one – but without any explanation. If we take the first example

gst-launch filesrc location=hello.mp3 ! mad ! audioresample ! osssink

you could then describe what is happening. e.g.

gst-launch is a program which enables the user to construct pipelines using command-line parameters.

Filesrc is an element (or a plugin) – in this case it will read data from a file and needs to know the name of the file to open. It will output the data so as to be the source for the next element in the pipe-line.

The “!” symbol separates the first element from the next.

mad is the next element in the pipe-line: It will decode mp3 data. It picks up the source provided by the previous element and then outputs the decoded data for the next element in the pipe-line.

Once again, a “!” symbol separates the elements.

audioresample resamples the Audio. (I don’t know why this is a benefit – it could be explained)

Another “!”

osssink takes the audio signal and sends it to an output device which supports (or is supported by) OSS.

The second example could then be similarly explained – which would be a useful exercise since the single vob file is being demuxed with part of the data going one way and the rest another.

A reference, at this point to the Overview of available plug-ins would be beneficial.

Perhaps an example where more options need to be specified could also be explained.

Then you can say that, if you need to build this into an application, you can do the same stuff with code and if you need to do something which is not currently supported, you can write your own plug-in – so read on...

I hope this is useful

Ian


On 27/11/2012 22:52, Tim-Philipp Müller wrote:
On Tue, 2012-11-27 at 22:48 +0000, Ian Davidson wrote:

Hi,


I changed the Test Sources to use what I hoped would be real inputs
[ian@localhost ~]$ gst-launch-1.0 --gst-debug-level=4 v4l2src 
'video/x-raw,format=(string)I420,width=320,height=240,framerate=(fraction)25/1' 
! queue ! mux. alsasrc ! audioconvert ! 
'audio/x-raw,rate=44100,channels=2' ! queue ! mux. avimux name=mux ! 
filesink location=test.avi

You seem to be missing a ! between v4l2src and the filter caps here.

Cheers
 -Tim

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