I am getting error while opening file with gstreamer in opencv below is my pipeline. I have searched on internet any try all possible things but nothing is working for me.
ERROR
[ WARN:0] OpenCV | GStreamer warning: unable to query duration of stream
[ WARN:0] OpenCV | GStreamer warning: Cannot query video position: status=1, value=1, duration=-1
cv::VideoCapture capture("filesrc location=a.mp4 ! qtdemux ! queue ! h264parse ! v4l2h264dec ! videoconvert ! video/x-raw,format=GRAY8 ,width=1280,height=720 ! appsink",CAP_GSTREAMER);
Related
I am creating a video stream from my headless raspberry pi using usb camera and opencv.
Ubuntu 18.04 LTS
Raspi OS: Bullseye
USB Camera
gst syntax test on terminal:
gst-launch-1.0 v4l2src device=/dev/video0 ! videoconvert! videoscale ! video/x-raw, width=640, height=480 ! autovideosink -v
In OpenCV C++:
string pipeline;
pipeline = "v4l2src device=/dev/video0 ! videoconvert! videoscale ! video/x-raw, width=640, height=480 ! autovideosink -v";
cv::VideoCapture cap(pipeline, cv::CAP_GSTREAMER);
When I launch the pipeline from terminal it creates a window with by usb webcam feed. However when I try to use the same pipeline from c++ it throws this error:
[ WARN:0] global ../modules/videoio/src/cap_gstreamer.cpp (734) open OpenCV | GStreamer warning: Error opening bin: syntax error
[ WARN:0] global ../modules/videoio/src/cap_gstreamer.cpp (501) isPipelinePlaying OpenCV | GStreamer warning: GStreamer: pipeline have not been created
terminate called after throwing an instance of 'std::invalid_argument'
what(): cannot predict with an empty OpenCV image
Aborted
What am i missing in the syntax in the code?
Edit:
After some trials I could get the pipeline generated, with this:
pipeline = "v4l2src device=/dev/video0 ! videoconvert! video/x-raw, width=640, height=480 ! appsink";
and warning:
[ WARN:0] global ../modules/videoio/src/cap_gstreamer.cpp (961) open OpenCV | GStreamer warning: Cannot query video position: status=0, value=-1, duration=-1
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some stuff for that frame
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[ WARN:0] global ../modules/videoio/src/cap_gstreamer.cpp (509) isPipelinePlaying OpenCV | GStreamer warning: unable to query pipeline state
[ WARN:0] global ../modules/videoio/src/cap_gstreamer.cpp (1824) handleMessage OpenCV | GStreamer warning: Embedded video playback halted; module v4l2src0 reported: Could not read from resource.
When searched for it, I found this post. Which led to a bug report here and here.
I am using OpenCV 4.5, and I assume that bug would have been fixed by later version as it was reported for OpenCV 3.4.
when I am trying to send a video sample that I downloaded from the internet, which has both AAC and H-264 codecs the following command is working fine. but when I generated the mp4 file using OpenCV which has only the H-264 codec and no AAC as there was no audio it is giving me the following error.
command :
gst-launch-1.0 -v filesrc location="YourAudioVideo.mp4" ! qtdemux name=demux ! queue ! h264parse ! video/x-h264,stream-format=avc,alignment=au ! kvssink name=sink stream-name="audio-video-file" access-key="YourAccessKeyId" secret-key="YourSecretAccessKey" streaming-type=offline demux. ! queue ! aacparse ! sink.
error log :
Additional debug info:
./grammar.y(506): gst_parse_no_more_pads (): /GstPipeline:pipeline0/GstQTDemux:demux:
failed delayed linking some pad of GstQTDemux named demux to some pad of GstQueue named queue0
WARNING: from element /GstPipeline:pipeline0/GstQTDemux:demux: Delayed linking failed.
Additional debug info:
./grammar.y(506): gst_parse_no_more_pads (): /GstPipeline:pipeline0/GstQTDemux:demux:
failed delayed linking some pad of GstQTDemux named demux to some pad of GstQueue named queue1
ERROR: from element /GstPipeline:pipeline0/GstQTDemux:demux: Internal data stream error.
Additional debug info:
qtdemux.c(5850): gst_qtdemux_loop (): /GstPipeline:pipeline0/GstQTDemux:demux:
streaming stopped, reason not-linked (-1)
Execution ended after 0:00:00.005448416
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
Freeing pipeline ...
You obviously remove the AAC part in your pipeline then:
gst-launch-1.0 -v filesrc location="YourAudioVideo.mp4" ! qtdemux name=demux ! queue ! h264parse ! video/x-h264,stream-format=avc,alignment=au ! kvssink name=sink stream-name="audio-video-file" access-key="YourAccessKeyId" secret-key="YourSecretAccessKey" streaming-type=offline
i am trying to play sequence of image(.jpeg) from my local folder to play as h264 video in VLC player through local host connection.
I am using Gstreamer lib to stream support and i am using from test-launch.c from github samples
OS : Linux 18.04
Gstremer ver: 1.14.2 Building from source using Cerbero
Following command is used to set the parser
multifilesrc location=/home/user/Downloads/gen/img.%4d.jpeg loop=true caps=image/jpeg,framerate=10/1 ! jpegdec ! x264enc ! h264parse ! rtph264pay name=pay0 pt=96
but no streaming happening insted i can see a error like below
(Gstremer_img2vid2:21273): GStreamer-CRITICAL **: 15:57:21.547: gst_bin_get_by_name: assertion 'GST_IS_BIN (bin)' failed
0:01:26.143446201 21273 0x55555592b850 ERROR rtspclient rtsp-client.c:3105:handle_setup_request: client 0x5555559d5260: no control in path '/test'
Any help will be appreciated thanks
You may have to provide size of the frames for jpeg decoding (here using 640x480):
test-launch "multifilesrc location=/home/user/Downloads/gen/img.%4d.jpeg loop=true ! image/jpeg,width=640,height=480,framerate=10/1 ! jpegdec ! x264enc insert-vui=1 ! h264parse config-interval=1 ! rtph264pay name=pay0"
Should be ok for receiving on localhost using vlc:
cvlc rtsp://127.0.0.1:8554/test
Hy i tried to play a doorbird live audio stream via gstreamer gst-launch.
I found a code snipped in an fhem server script.
It should be possible with the command gst-launch-1.0 filesrc location=<http://12.0.0.231/bha-api/audio-receive.cgi user=xxxx passwd=xxxx> ! wavparse ! audioconvert ! lame ! filesink location=a.mp3
But i get following error: lame not found. if i change lame to lame lamemp3enc i get the error file not found http://12.0.0.231/bha-api/audio-receive.cgi
What do i wrong?
I am trying to play a .ts file with Gstreamer-1.0 as well as gst-omx have been successfully installed .
Try to play ts video using below command line format but failed to play.
test#test-Gardenia:~/Videos$ gst-launch-1.0 -v filesrc location= mpeg2.ts ! tsdemux ! mpegvideoparse ! omxmpeg2dec ! videoconvert ! ximagesink
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
ERROR: from element /GstPipeline:pipeline0/GstTSDemux:tsdemux0: Internal data stream error.
Additional debug info:
mpegtsbase.c(1347): mpegts_base_loop (): /GstPipeline:pipeline0/GstTSDemux:tsdemux0:
stream stopped, reason not-linked
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
/GstPipeline:pipeline0/GstTSDemux:tsdemux0.GstPad:audio_0044: caps = "NULL"
Freeing pipeline ...
Tried below command also but not did not work.
test#test:~/Videos$ gst-launch-1.0 filesrc location= mpeg2.ts ! tsdemux ! tsparse ! omxmpeg2dec ! videoconvert ! ximagesink
WARNING: erroneous pipeline: could not link mpegtsparse2-0 to omxmpeg2videodec-omxmpeg2dec0
Can any one help me how to play .ts file with mpeg2 codec format using gstreamer