gstreamer

I am on ubuntu and want to convert a mp4 video to an mp3 audio file but can't figure out how. I tried installing ffmpeg but it failed to encode the mp3. I've read the gstreamer does it but I can't figure out how. I have gstreamer and python installed. I can program with python, but am not super comfortable compiling software from source or any higher level command line stuff. I only know the basics on the command line. mplayer <videofile> -dumpaudio -dumpfile out.bin it will copy the raw audio stream, that should then be easily converted using sox, lame, vlc or whatnot. VLC has nice conversion

i'm trying to take a video with webcam using opencv and python with a simple code import numpy as np import cv2 cap = cv2.VideoCapture(0) print('cap.isOpened') if cap.isOpened(): print ('cap is opened') while(True): re,img=cap.read() cv2.imshow("video output", img) k = cv2.waitKey(10)&0xFF if k==27: break cap.release() cv2.destroyAllWindows() it's working fine if i try to play an existing video such as .mp4 file. but when i try using a webcam i got an error GStreamer-CRITICAL **: gst_element_get_state: assertion 'GST_IS_ELEMENT (element)' failed cap.isOpened for more information i'm using

In my program I use PyGObject/PyGI and GStreamer to show a video in my GUI. The video is shown in a Gtk.DrawingArea and therefore I need to get it's window-handle in the realize -signal-handler. On Linux I get that handle using: drawing_area.get_property('window').get_xid() But how do I get the handle on Windows? I searched on the internet but found only examples for PyGtk using window.handle which does not work using PyGI. The GStreamer documentation provides an example which uses the GDK_WINDOW_HWND macro to get the handle. This macro uses AFAIK gdk_win32_drawable_get_handle . But how to do

I just installed OpenCV 3.0 following this tutorial: http://rodrigoberriel.com/2014/10/installing-opencv-3-0-0-on-ubuntu-14-04/ I didn't encounter any error during the installation process. However, when I tried running the a sample program such as the following, cd cpp/ ./cpp-example-facedetect lena.jpg // (../data/lena.jpg) OpenCV 3.0 beta ./cpp-example-houghlines pic1.png // (../data/pic1.jpg) OpenCV 3.0 beta I get the following error: Processing 1 lena.jpg GStreamer: Error opening bin: Unrecoverable syntax error while parsing pipeline lena.jpg Capture from AVI didn't work init done opengl

I'm trying to write a program in C which replicates the pipeline: gst-launch -v filesrc location="bbb.mp4" ! decodebin2 ! ffmpegcolorspace ! autovideosink DecodeBin2 has a dynamic pad and I've attached a callback to handle its creation. I am unable to link it to ffmpegcolorspace however because the pad capability is always video/quicktime. I would like it to be video/x-raw-yuv or something else which is compatible with ffmpegcolorspace. Is this possible to force/select the output type of decodebin2? Thanks. EDIT: Please do not recommend playbin. I'm trying to learn how how to make pipelines.

I have got one HD video "ed_hd.avi" on System#1. Would like to stream it over network and play the content from System#2. I am using GStreamer on Ubuntu 11.04, tried a lot on this. Variety of errors makes this objective difficult to diagnose. Will be thankful for getting a working command for the System#1-end and System#2-end. What I have tried is as follows: System #1: gst-launch filesrc location=ed_hd.avi ! decodedin ! x263enc ! video/x-h264 ! rtph264pay ! udpsink host=127.0.0.1 port=5000 System #2: gst-launch udpsrc port=5000 ! rtph264depay ! decodebin ! xvimagesink Objective is : Convert

I am capturing and processing video frames with OpenCV, and I would like to write them as a h265 video file. I am struggling to get a proper Gstreamer pipeline to work from OpenCV. Gstreamer works fine by itself. In particular, I am able to run this command, which encodes video very quickly (thanks to GPU acceleration) and saves it to a mkv file: gst-launch-1.0 videotestsrc num-buffers=90 ! 'video/x-raw, format=(string)I420, width=(int)640, height=(int)480' ! omxh265enc ! matroskamux ! filesink location=test.mkv Now I would like to do the same thing from within my OpenCV application. My code