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• Artifacts in screen captures from h.264 video using python-ffvideo

  8 juin 2015, par ajt

  I am using a python module called python-ffvieo to capture video stills from mkv files that are h.264 encoded. When I perform my screen captures the image files are heavily pixelated and contain many artifacts.

  I have converted one of the mkv files to a flv file and am able to get screen captures from it with no artifacts or pixilation. I am wondering if this is a codec issue or something similar, but I am not sure how even to go about troubleshooting it.

  Here is the information from ffmpeg on the mkv file that I am trying to get the image captures from :

  Input #0, matroska,webm, from 'mm.mkv':
  
    Metadata:
  
      encoder         : libebml v1.3.0 + libmatroska v1.4.1
  
      creation_time   : 2014-10-13 23:55:52
  
    Duration: 00:48:03.71, start: 0.000000, bitrate: 1370 kb/s
  
      Stream #0:0: Video: h264 (High), yuv420p(tv), 1280x720 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
  
      Stream #0:1: Audio: ac3, 48000 Hz, 5.1(side), fltp, 384 kb/s (default)

  And here is an image sample of the pixelation that I am talking about :

  

  I know that this isn’t much to go off of and that the python module that I am using is kind of old, but I could really use some help.
  Are these types of artifacts common when there is an encoding issue ? Can anyone tell me what I should be looking into to troubleshoot this ? I appreciate any and all help.

• automatically show blue screen in ffmpeg when live video source disconnects

  13 janvier 2015, par user1913115

  i’m capturing a live source using ffmpeg :

  ffmpeg -i rtsp://192.168.1.143/source -codec copy output.mp4

  which works great. the ip address is an address of an RTSP proxy server which takes in the camera itself as the source. i.e. my setup :

  camera ->> RTSP proxy ->> ffmpeg(output)

  if camera disconnects (accidentally or on purpose) the recording stops (obviously) and only continues when I re-connect the camera.

  Question : is there a way for ffmpeg to ’fill’ the down time with blue screen or green screen of some sort ?
  i know i can ’play’ a still image of a green screen using ffmpeg to record an mp4 out of it :

  ffmpeg -loop 1 -y -re -i green.jpg -r 30 -vcodec libx264 -an -f h264 greenvideo.mp4

  so i could set it up this way :

  ffmpeg(green) ->> ffmpeg(output)

  but I would need to run the command manually. is there a way for ffmpeg(output) to automatically detect the disconnect and use green.jpg as a ’video’ source ? or i can even create a 5-minute green.mp4 video of just green screen.

  put it another way, is it possible for ffmpeg to automatically switch input sources if one goes down ?

• Introducing CI Status : the build dashboard for Travis CI

  6 octobre 2014, par Matthieu Napoli — Development, Meta

  The Piwik team has been working on a new tool for developers : CI Status.

  CI Status is a dashboard displaying the latest build status for all your repositories set up on Travis-CI.org or Travis-CI.com. The usage is meant to be as simple as possible : just login using your GitHub account and enjoy.

  CI-status.com

  Give CI Status a try now at ci-status.com !

  

  On your server : Setup CI Status

  The application is open source (released under the GNU Affero General Public License) and developed on GitHub. You are encouraged to contribute to the GitHub project if you find any bug or if you want to add new features. Since it was developed with reusability in mind, you can also install and maintain the application on your own server.

  We hope you will find this tool as useful as we do !