Before using OpenCV’s Gstreamer API, we need a working pipeline using the Gstreamer command line tool. Sender: The OP is using JPEG encoding, so this pipeline will be using the same encoding. gst-launch-1.0 -v v4l2src \ ! video/x-raw,format=YUY2,width=640,height=480 \ ! jpegenc \ ! rtpjpegpay \ ! udpsink host=127.0.0.1 port=5000 Receiver: The sink caps for rtpjpegdepay … Read more
Looks like we can call the camera using a proper GStreamer pipeline like below: VideoCapture cap(“mfw_v4lsrc ! ffmpegcolorspace ! video/x-raw-rgb ! appsink”) as the camera output is in YUV, we need to convert that to RGB to pass the frames to OpenCV. This is where OpenCV makes sure it gets RGB colorspace.
According to https://groups.google.com/forum/?fromgroups#!msg/android-ndk/J3lzK4X–bM/4YaijymZy_AJ Yes, and this is the documented behaviour: you must load libraries in reverse dependency order explicitely. […] It is a limitation of the system. In a nutshell, the dynamic linker doesn’t know anything about your application (e.g. where its libraries live), it only knows about the LD_LIBRARY_PATH value that was set when … Read more
I have a “C” implementation of the code you are looking for. I think it should be fairly simple to convert to “Python” //Display RTSP streaming of video //(c) 2011 enthusiasticgeek // This code is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of … Read more
It is a very easy Task using ffmpeg with python subprocess and there is a reason why people are pointing to this solution as a good solution. This is the basic command extracting audio from a given video File: ffmpeg -i test.mp4 -ab 160k -ac 2 -ar 44100 -vn audio.wav The Python Code is just … Read more
I’ve made all tutorials from the Gstreamer’s site work but it was very hard. To help another people I documented it. Here’s the tutorial for linux (ubuntu) but might work on windows too, if you have any question regarding it, just ask :)… I will also link a project from gitlab ready to run in … Read more
I found the solution, lots of stuff was missing. I used the need-data signal like the examples of gst-rtsp-server. I changed some default parameters of appsrc, like the is-live, block and format. The caps on the appsrc element. I was not setting the offset of the buffer correctly. Here’s the code for anyone who’s facing … Read more
I solved it by swapping the byteplanes myself on Android level, using a simple function: public byte[] swapYV12toI420(byte[] yv12bytes, int width, int height) { byte[] i420bytes = new byte[yv12bytes.length]; for (int i = 0; i < width*height; i++) i420bytes[i] = yv12bytes[i]; for (int i = width*height; i < width*height + (width/2*height/2); i++) i420bytes[i] = yv12bytes[i … Read more