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• Camera video capture to file in Xamarin using OpenCV and FFmpeg

  9 novembre 2017, par Bz Burr

  I’m currently building an Android App in Xamarin. Part of the app has a camera page that will be used to capture Videos.
  I currently use OpenCV to overlay some text on the video (time / date and other interesting stuff). This correctly displays on the screen.

  What I need to be able to do is to allow to users capture video and to make sure this data remains on the video.
  I can’t figure out how to use FFMPeg to make this happen. Should I be using the mediaRecorder somehow as, I’m guessing, OpenCV’s ?

  public Mat OnCameraFrame(Mat p0)

  Is the first stop for the frame along any sort of video capture process.
  I don’t want to just capture the phone’s screen as there are various buttons, etc that don’t belong in a video and of course I do want to capture the audio with the video.

  Can someone point me in the right direction ?

• Rotated video with ffmpeg doesn't play in flowplayer in IE9

  3 avril 2018, par yoshi

  I have a script that rotates videos 90 degrees and then the videos are displayed on a web page using flowplayer (HTML5 version, not Flash). After the video is rotated once it does not play in IE9 but plays without any other problems in Chrome and Firefox.
  The error message is : Video file not found.

  I’ve looked in IE9’s developer tools console, in the network tab and the browser streams the whole video.

  The following is the ffmpeg command I use to rotate and convert the video :

  ffmpeg -i input.mov -y -r 30 -b 4M -vf 'transpose=1,scale=800:trunc(ow/a/2)*2' -ar 48000 -vcodec libx264 -profile baseline -preset slow -level 2.2 output.mp4

  This is the input file which I used : https://dl.dropboxusercontent.com/u/37994/local%20capture.mov

  This is the output video : https://dl.dropboxusercontent.com/u/37994/local%20capture%20rotated.mp4

  The input video from above is a screen capture made using QuickTime on Mac OS.

  This also happened for this video : http://mirrorblender.top-ix.org/peach/bigbuckbunny_movies/big_buck_bunny_480p_h264.mov
  And also this one : https://dl.dropboxusercontent.com/u/37994/clipcanvas_14348_offline.mp4

  This didn’t happen for the sample .mov from here : http://support.apple.com/kb/ht1425

  If I run the command twice, meaning I rotate the video 90 degrees and then I rotate the output using the same command once more, the problem disappears, but I need to be able to rotate only 90 degrees.

  This problem doesn’t happen if I put IE9 in IE7 or IE8 compatibility mode.

  I was thinking that maybe the problem was how the server serves the video but there’s no problem with other videos.

  I looked at the metadata with ffmpeg but didn’t see anything significant.

  I already have AddType video/mp4 .mp4 in .htaccess.

  I can’t seem to pin down what’s causing this problem.

  Edit :

  Request in IE9
  

  Response in IE9
  

• How do I record a Selenium Grid Session (Via VNC, Remote Frame Buffer - RFB) to an H264 encoded MP4 [closed]

  25 février, par Frobbit

  When my integration tests fail, I want to be able to watch the video of the test running. I test a full stack app with docker-compose and I use the single container Selenium-grid. If I save every Secenerio to a file, I can quickly review a failed test.

  


  I'm trying to record a Selenium Grid session and save it as an MP4 file using GStreamer and VNC. I need a solution that captures the VNC session running in the Selenium Grid container and writes the output to an H264 encoded mp4 file.

  


  Here's the context :

  


  I'm using Selenium Grid with a VNC server running in the container.
I can access the VNC session using the se:vncLocalAddress capability.

  


  I would like a tool that can record the VNC remote framebuffer (RFB) output.

  


  Can someone provide a reliable way to record a Selenium Grid session to an MP4 file using a tool like GStreamer or ffmpeg ?