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It had to do with the fps of input stream (which was extremely low) and HLS settings on my streaming server. Once I reduced the packet length (in time) it worked fine.

Hi

I want to build opencv with GStreamer support.

I built the GStreamer from source (version 1.8.1) following this guide: http://kacianka.at/?p=145 I have 'gstreamer_build' folder at my home directory and it contains 'bin' folder with these:

gst-device-monitor-1.0 gst-discoverer-1.0 gst-inspect-1.0 gst-launch-1.0 gst-play-1.0 gst-stats-1.0 gst-typefind-1.0 orc-bugreport orcc

I have this path added to my environment variable PATH.

When I use cmake like:

cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib/modules -D BUILD_opencv_python3=ON -D WITH_GSTREAMER=ON -D WITH_FFMPEG=OFF ..

I get the following output clearly indicating that gstreamer is not found:

-- checking for module 'gstreamer-base-1.0'
--   package 'gstreamer-base-1.0' not found
-- checking for module 'gstreamer-video-1.0'
--   package 'gstreamer-video-1.0' not found
-- checking for module 'gstreamer-app-1.0'
--   package 'gstreamer-app-1.0' not found
-- checking for module 'gstreamer-riff-1.0'
--   package 'gstreamer-riff-1.0' not found
-- checking for module 'gstreamer-pbutils-1.0'
--   package 'gstreamer-pbutils-1.0' not found
-- checking for module 'gstreamer-base-0.10'
--   package 'gstreamer-base-0.10' not found
-- checking for module 'gstreamer-video-0.10'
--   package 'gstreamer-video-0.10' not found
-- checking for module 'gstreamer-app-0.10'
--   package 'gstreamer-app-0.10' not found
-- checking for module 'gstreamer-riff-0.10'
--   package 'gstreamer-riff-0.10' not found
-- checking for module 'gstreamer-pbutils-0.10'
--   package 'gstreamer-pbutils-0.10' not found

and this:

Video I/O:
--     DC1394 1.x:                  NO
--     DC1394 2.x:                  NO
--     FFMPEG:                      NO
--       codec:                     NO
--       format:                    NO
--       util:                      NO
--       swscale:                   NO
--       resample:                  NO
--       gentoo-style:              NO
--     GStreamer:                   NO
--     OpenNI:                      NO
--     OpenNI PrimeSensor Modules:  NO
--     OpenNI2:                     NO
--     PvAPI:                       NO
--     GigEVisionSDK:               NO
--     UniCap:                      NO
--     UniCap ucil:                 NO
--     V4L/V4L2:                    Using libv4l1 (ver 1.0.1) / libv4l2 (ver 1.0.1)
--     XIMEA:                       NO
--     Xine:                        NO
--     gPhoto2:                     NO

Can anyone help me with this?

Output video: https://youtu.be/VxfoBQjoY6E

Explanation:

I want to: Process camera stream in Opencv and push it over to RTMP server. I already have NGINX (RTMP module) set up and I have tested streaming videos with both RTMP (Flash Player) and HLS.

I am reading the frames in a loop and using 'subprocess' in python to execute ffmpeg command. Here's the command I am using:

command = [ffmpeg,
    '-y',
    '-f', 'rawvideo',
    '-vcodec','rawvideo',
    '-pix_fmt', 'bgr24',
    '-s', dimension,
    '-i', '-',
    '-c:v', 'libx264',
    '-pix_fmt', 'yuv420p',
    '-preset', 'ultrafast',
    '-f', 'flv',
    'rtmp://10.10.10.80/live/mystream']


import subprocess as sp
...
proc = sp.Popen(command, stdin=sp.PIPE,shell=False)
...
proc.stdin.write(frame.tostring()) #frame is read using opencv

Problem:

I can see the stream fine but it freezes and resumes frequently. Here's the output of FFMPEG terminal log:

Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
frame=  117 fps= 16 q=22.0 size=     344kB time=00:00:04.04 bitrate= 697.8kbits/s speed=0.543x

It mentions speed at the end. I believe it should be close to 1x. I am not sure how to achieve that.

And I am on the same network as server, I can post my python code if required. Need some ffmpeg guru to give me some advise.