Re: ksvideo...? newbie question

[filnet]

Hi,

Try adding a videoconvert or decodebin between the autovideosrc and the autovideosink.

Philippe.

Le Vendredi 22 décembre 2017 23h14, pangit_ako <[hidden email]> a écrit :

Greetings,

  I am new to GStreamer...please excuse my ignorance...I am trying to learn

this as quickly as I am able.  I have the program(s) installed (Windows

Vista) and have fired up the command line.  I type the following 'test'

pipeline...and it works just fine:

gst-launch-1.0.exe videotestsrc ! autovideosink

This also works fine when I change the properties to 'snow', 'ball',

'red'...etc...

  However when I attempt to use my webcam (by using 'autovideosrc'), I get

an error of which I'm not exactly sure to what it is referring...here is the

command followed by the output generated from GStreamer:

gst-launch-1.0 autovideosrc ! video/x-raw,width=640,height=480 ! jpegenc !

rtpjpegpay ! udpsink host=127.0.0.1 port=5200

"setting pipeline to PAUSED...

"pipeline is live and does not need PREROLL...

ERROR from element

/GstPipeline:pipeline0/GstAutoVideoSrc:autovideosrc0/GstKsVideoSrc:autovideosrc0-actual-src-ksvide:

internal data stream error.

Additional debug info:

gstbasesrc.c(2939):

gst-base-src-loop():/GstPipeline:pipeline0/GstAutoVideoSrc:autovideosrc0/GstKsVideoSrc:autovideosrc0-actual-video-src-ksvide:

streaming stoppped, reason not-negotiated (-4)

ERROR: pipeline doesn't want to preroll...

Setting pipeline to PAUSED...

Setting pipeline to READY...

Setting pipleine to NULL...

Freeing pipeline..."

I believe the same error occurs using an even more simplified command of

the above:

gst-launch-1.0 autovideosrc ! autovideosink

My system is an Acer TM 5720 laptop...Windows Vista OS...I know my built-in

webcam (Acer Crystal Eye) is functioning...because it seems to work without

any problems in other applications...so it is not the webcam or a driver

issue.  I seem to see this same error message no matter what I use as a

'src' element...?  It is possible this is an OS problem (perhaps MS Vista is

not supported)...??? 

  Any insight about what the problem might be would be greatly

appreciated...again remember I'm new to GStreamer so I apologize in advance.

Regards.

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[pangit_ako]

Hello Philippe,

  Thanks for your reply...I tried both 'videoconvert' and 'decodebin'...with
the same exact results...same error as before...

  I used the following pipelines:

 gst-launch-1.0 autovideosrc ! videoconvert ! autovideosink
 gst-launch-1.0 autovideosrc ! decodebin ! autovideosink

  No matter what I attempt that same error message is thrown...I guess I may
have to try this on a machine with a more recent OS...although I would think
I should be able to get this to work on my Vista machine since the
'videotestsrc' works just fine...?

 Thanks for your time in replying to my message, I appreciate that.



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[Nicolas Dufresne-5]

Le 23 déc. 2017 2:21 PM, "pangit_ako" <[hidden email]> a écrit :

Hello Philippe,

  Thanks for your reply...I tried both 'videoconvert' and 'decodebin'...with
the same exact results...same error as before...

  I used the following pipelines:

 gst-launch-1.0 autovideosrc ! videoconvert ! autovideosink
 gst-launch-1.0 autovideosrc ! decodebin ! autovideosink

And what about both ?

  autovideosink ! decodebin ! videoconvert ! autovideosink

  No matter what I attempt that same error message is thrown...I guess I may
have to try this on a machine with a more recent OS...although I would think
I should be able to get this to work on my Vista machine since the
'videotestsrc' works just fine...?

 Thanks for your time in replying to my message, I appreciate that.

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