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• OpenCV videowriter H264 codec (ffmpeg)

  29 décembre 2014, par alcon

  I want to save a video with opencv with lossless compresion so I don’t lose any details of the frames. Everything works with the xvid codec but offcourse this is not a lossless compression so I found that the x264 codec is suitable. However it doesn’t work, I tried the following sample code but while running I get the following error : "could not find encoder for codec id 28 : encoder not found."

  cv::VideoWriter makeVideo;
  
  makeVideo.open("makevideo//newVideo.mp4", CV_FOURCC('X','2','6','4'), 30, cv::Size(1600,1200), true);
  
  cv::Mat image = imread("makevideo//frames//111.png");
  
  
  
  for(int i = 0; i < 200; i++)
  
      makeVideo << image;
  
  
  
  makeVideo.release();

  I found that for this to work, I need to have ffmpeg support. I’m currently using opencv2.4.6 and in this discussion (how can I use the openCV FFMPEG video I/O rather than the DirectShow one in Windows ?) someone mentioned that in opencv2.4 ffmpeg is automatically included. But its not working....

  Here (How to compile OpenCV 2.3 with ffmpeg support with Visual Studio 2010) I found how to compile opencv and ffmpeg yourself on windows. I followed all the steps sucessfully but still I get the same error....

• Use ffmpeg in Unity [closed]

  26 avril 2020, par DenVebber

  I need to use FFmpeg library for develop Unity Android application. Are there any specific solutions for this ?
I know how to connect FFmpeg libraries to Java in Android Studio, but is it the best to use in Unity ?

  


• How can I schedule a YouTube livestream entirely from Linux ?

  25 avril 2021, par Dale Wellman

  I have a setup on a Raspberry Pi (with its native camera) that uses a cronjob to start an ffmpeg session with its output streaming to YouTube. I re-use the same stream key each time, which is written into my ffmpeg scripts. This all works perfectly each week, automatically starting and stopping at the desired time.
However, each week PRIOR to that livestream, I have to "manually" go into YouTube Studio and "schedule" a new future event. This is easy enough, since it lets me "reuse" previous settings — all I have to change is the Title, date, and time. But I would love to figure out a way to automate that part of the process, as well. I assume it involves using the YouTube Data API, but I'm not well versed in API's, JSON, etc.
(I do have a strong Linux background, bash scripting skills, and general programming background.)

  


  My final solution just needs to :

  


  

  • create the new scheduled event (maybe 12 hours prior to going live), with Title, Date, Time, "Unlisted" status, category, and so forth — all the usual settings I do manually within Studio

  


  • retrieve the assigned URL for the upcoming stream (my script will then email that to me)

  


  


  So, basically, I'm asking for help getting started with the API, or whatever method is capable of doing this. I would prefer to code it on the same Pi that does the ffmpeg encoding (although in a pinch, I could create the schedule from another computer, even Windows). Any examples would be great.

  


  So far, all I have done is create my Google project, enable the YouTube Data API in the project, and create my API key. But I'm not sure where to go from there.