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• Firefox, Chrome, Safari have grey background for MP4 HTML5 video

  5 avril 2016, par James

  Any video (that I can make) with a white background becomes grey in Firefox, Chrome, and Safari (it is white in IE). Well, on my Windows machine it is grey, on my Android phone/tablet and Mac it is white...

  I am using ffmpeg to encode the video. If I encode it as webm, the background is white.

  See: https://jsfiddle.net/Lbg8f6ck/

  I found a hack that fixes it for Chrome:

  code>

  But it does not work for Firefox or Safari.

  Another hack for Firefox:

  filter:brightness(1.085)
  

  But for some reason setting it through JavaScript does not work.

  A few versions ago the background was white for Chrome, then became grey again...

  The question is: Why is white grey?

  Is it an issue with the video or with Chrome, Firefox, Safari in general? (How can they not support white?)

  Is it possible to get a white background?

  Any hacks, workarounds?

• JAVA RTSP Opening IP Cam failed on 401 - Unauthorized

  5 avril 2016, par Filip Majerík

  Morning,

  i have problem with opening stream at my IP Cam D-Link DSC-935L. All works good in VLC, but when i try open stream at Java over the OpenCV (with opencv_ffmpeg310_64.dll) & VideoCapture - i get only this error:

  [rtsp @ 000000002defd160] method DESCRIBE failed: 401 Unauthorized

  My code snippet

  videoCapture = new VideoCapture();
  videoCapture.open("rtsp://admin@10.0.0.20:554/upceSource.mjpg");
  
  if (!videoCapture.isOpened()) {
      System.out.println("FAILED");
  }else{
      System.out.println("OK");
  }
  

  How i can pass username by another way? I have no password set.

  Login: admin

  Password: unused

  Thanks for all help.

• What is the right and most efficient way to access the last 30 seconds of a mpeg ts stream using Python ? [on hold]

  5 avril 2016, par Jabb

  I have a mpeg ts stream from my dvb card that is written to disk. I'd like to access this stream continuously (last 30 seconds, every 20 seconds) from Python.

  I am not looking for a complete solution here, but rather some ideas how to accomplish this in the most efficient manner with regards to CPU and RAM usage.

  Any ideas will be greatly appreciated!

• Best way to stream live video under webRTC development [on hold]

  5 avril 2016, par Ankit Dhanna

  I have implemented webrtc live video chat with multiple presentors (using licode ). However, I want to ask how can I broadcast this video stream so that multiple users who are not on webrtc can be served ?

  Where/Which server should I broadcast this stream to to get least lag time ?

• How to write a video encoder with ffmpeg that explicitly controls the position of keyframes ?

  5 avril 2016, par SunnyShah

  I want to write an encoder with ffmpeg which can put iFrames (keyframes) at positions I want. Where can I found tutorials or reference material for it?

  P.S
  Is it possible to do this with mencoder or any opensource encoder. I want to encode H263 file. I am writing under & for linux.