GStreamer : Pipeline to connect VNC server and Display/Record the remote GUI

ODБOï

@jsulm hi
i only include <gst/gst.h>

about parameters, i also tryed to compile the program without passing any parameters to gst_bus_timed_pop_filtered
and had this output :
too few arguments to function 'GstMessage* gst_bus_timed_pop_filtered(GstBus*, GstClockTime, GstMessageType)'
msg = gst_bus_timed_pop_filtered();
^

jsulm

@LeLev said in GStreamer : understanding the concept of 'pipeline':

without passing any parameters

this will for sure not work as the function expects 3 parameters: https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstBus.html#gst-bus-timed-pop-filtered

Can you post the whole error message with the parameters you were passing before?
Maybe the type of "bus" was wrong?

ODБOï

@jsulm

     gst_init (&argc, &argv);
     GstElement *pipeline;
     GstBus *bus;
     GstMessage *msg;

     pipeline = gst_parse_launch ("playbin uri=https://www.freedesktop.org/software/gstreamer-sdk/data/media/sintel_trailer-480p.webm", NULL);

       gst_element_set_state (pipeline, GST_STATE_PLAYING);
       
       bus = gst_element_get_bus (pipeline);
       msg = gst_bus_timed_pop_filtered(bus, GST_CLOCK_TIME_NONE, GST_MESSAGE_ERROR | GST_MESSAGE_EOS);

output :

no matching function for call to 'gst_bus_timed_pop_filtered'

erreur : invalid conversion from 'int' to 'GstMessageType' [-fpermissive]
        msg = gst_bus_timed_pop_filtered(bus, GST_CLOCK_TIME_NONE, GST_MESSAGE_ERROR | GST_MESSAGE_EOS);
                                                                   ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~

jsulm

@LeLev said in GStreamer : understanding the concept of 'pipeline':

GST_MESSAGE_ERROR | GST_MESSAGE_EOS

this is the actual problem. Try to cast it to GstMessageType:

msg = gst_bus_timed_pop_filtered(bus, GST_CLOCK_TIME_NONE, static_cast<GstMessageType>(GST_MESSAGE_ERROR | GST_MESSAGE_EOS));

ODБOï

i just changed the 3rd parameter and it compiled

msg = gst_bus_timed_pop_filtered(bus, GST_CLOCK_TIME_NONE, GST_MESSAGE_EOS);

ODБOï

@jsulm said in GStreamer : understanding the concept of 'pipeline':

ry to cast it to GstMessageType:

Thank you !

jsulm

@LeLev That's why it is important to post all errors: many errors are just follow up errors caused by another error.

ODБOï

@jsulm said in GStreamer : understanding the concept of 'pipeline':

all errors

saved for the next time.

I'm confused about this lib.
In this hello world exemple they say :

If everything built fine, fire up the executable! You should see a window pop up, containing a video being played straight from the Internet, along with audio. Congratulations!

I can't figure out how a window will pop up.
I'm reading the playbin description right now, in my app nothing pops up.

jsulm

@LeLev said in GStreamer : understanding the concept of 'pipeline':

I can't figure out how a window will pop up.

So, you start the app but no window pops up?
Then probably something is wrong. I don't know what. You can debug and see what happens.

ODБOï

@jsulm said in GStreamer : understanding the concept of 'pipeline':

So, you start the app but no window pops up?

Yes,

@jsulm said in GStreamer : understanding the concept of 'pipeline':

probably something is wrong

yes, with putenv("GST_DEBUG=2"); i got :

0:00:03.253981299  1536 0000000037E010C0 WARN             souphttpsrc gstsouphttpsrc.c:1379:gst_soup_http_src_parse_status:<source> error: Secure connection setup failed.
0:00:03.254006642  1536 0000000037E010C0 WARN             souphttpsrc gstsouphttpsrc.c:1379:gst_soup_http_src_parse_status:<source> error: TLS/SSL support not available; install glib-networking (6), URL: https://www.freedesktop.org/software/gstreamer-sdk/data/media/sintel_trailer-480p.webm, Redirect to: (NULL)
0:00:03.254067912  1536 0000000037E010C0 WARN                 basesrc gstbasesrc.c:3055:gst_base_src_loop:<source> error: Internal data stream error.
0:00:03.254105765  1536 0000000037E010C0 WARN                 basesrc gstbasesrc.c:3055:gst_base_src_loop:<source> error: streaming stopped, reason error (-5)
0:00:03.254180509  1536 0000000037E010C0 WARN                typefind gsttypefindelement.c:991:gst_type_find_element_chain_do_typefinding:<typefindelement0> error: Stream doesn't contain enough data.
0:00:03.254192057  1536 0000000037E010C0 WARN                typefind gsttypefindelement.c:991:gst_type_find_element_chain_do_typefinding:<typefindelement0> error: Can't typefind stream

i will install glib-networking

jsulm

@LeLev You could try to play a video from a non-SSL (non-HTTPS) URL.

ODБOï

@jsulm That worked thank you!

ODБOï

Can please someone help me to complete this pipeline so it can record the VNC remote desktop to video file and/or show it with
playbin ?
pipeline = gst_parse_launch("rfbsrc host=xx.xx.xx.xx port=5900 password=passw view-only=true",NULL);

SGaist

Use the tee plugin.

ODБOï

@SGaist thank you, I tryed to use tee, but that is more complicated to do, i actually don't want to Watch and Save/record.
I would like to only save the video without displaying it.

after some houres i got this broken pipeline..

I have lot of troubles on how to set up the format for the video and write it to a file
I use ultraVnc server

"rfbsrc host=xx.xx.xx.xx port=5900 password=pw view-only=true   TODO : set up video format    ! mpegtsmux ! filesink location=testvideo.mp4"

i have this output

** (QVNCClient.exe:10252): CRITICAL **: gst_video_info_set_format: assertion 'format != GST_VIDEO_FORMAT_UNKNOWN' failed

** (QVNCClient.exe:10252): CRITICAL **: gst_video_info_to_caps: assertion 'info->finfo->format != GST_VIDEO_FORMAT_UNKNOWN' failed

(QVNCClient.exe:10252): GStreamer-CRITICAL **: gst_event_new_caps: assertion 'caps != NULL' failed

(QVNCClient.exe:10252): GStreamer-CRITICAL **: gst_pad_push_event: assertion 'GST_IS_EVENT (event)' failed

(QVNCClient.exe:10252): GStreamer-CRITICAL **: gst_mini_object_unref: assertion 'mini_object != NULL' failed
0:00:00.737522311 10252 0000000036FDDBC0 WARN                 basesrc gstbasesrc.c:3275:gst_base_src_prepare_allocation:<rfbsrc0> Subclass failed to decide allocation
0:00:00.737604753 10252 0000000036FDDBC0 WARN                 basesrc gstbasesrc.c:3055:gst_base_src_loop:<rfbsrc0> error: Internal data stream error.
0:00:00.737644531 10252 0000000036FDDBC0 WARN                 basesrc gstbasesrc.c:3055:gst_base_src_loop:<rfbsrc0> error: streaming stopped, reason not-negotiated (-4)
This program is linked against GStreamer 1.14.3

THX

SGaist

You have here an example of pipeline with h264 recording.

ODБOï

@SGaist hi,
I am still struggling with Gstreamer.

Could you please try to see where the probleme is ?
i try this pipeline :

gst-launch-1.0 -v rfbsrc host=xx.xx.x.xx port=5900 password=passw view-only=true !
tee name = t ! queue ! omxh264enc ! 
'video/x-h264, stream-format=(string)byte-stream' ! h264parse ! qtmux ! 
filesink location=test.mp4 t. ! queue ! videoscale ! video/x-raw, 
width=480,height=270 ! xvimagesink -e sync=false

OUTPUT :
*(gst-launch-1.0:8672): GStreamer-CRITICAL *: gst_element_make_from_uri: assertion 'gst_uri_is_valid (uri)' failed
WARNING: erroneous pipeline: no element "omxh264enc"

I downloaded and installed x264 from here but i still get same error

Maybe there is a simple way to just connect to VNC srv and only record without displaying.
Or a simple tool that i can start with QProcess

ODБOï

i tryed like this also :

gst-launch-1.0 rfbsrc host=xx.x.x.xx port=xxxx password=xxxx view-only=true ! videoconvert ! x264enc ! flvmux ! filesink location=xyz.flv

OUTPUT : WARNING : erroneous pipeline : no element "x264enc"

I found "x264enc" is part of gst-plugins-ugly but cant fugure out how to install tath missing plugin. I downloaded it from here

I also found a tool : vnc2flv
i need to build it with python but when i try i get :

error print version
Missing parentheses in call to 'print'. Did you mean print(version)

jsulm

@LeLev said in GStreamer : understanding the concept of 'pipeline':

gst-plugins-ugly but cant fugure out how to install tath missing plugin

apt install gstreamer1.0-plugins-ugly

ODБOï

@jsulm hi ,
I did not mension I'm using windows.