Sur d’autres sites (7675)

• Inserting an image inside a video every few frames using ffmpeg

  9 mars 2017, par Erez Hochman

  Can I use FFMPEG to insert an image every 20 frames in a video ?
  I’m trying to create a subliminal message experiment and I thought it would be an easy way to make it but I can’t find anything online.

  I tried to make something myself and created a script that :
  1.splits a file into audio and video files
  2.splits the video into frames
  3.overwrites every 20th image in the sequence with the message image
  4.re-encoding the video
  5.concatenating it with the original audio

  this works but it’s way more disk space consuming to be comfortable, is there a better way to do this ?
  any advice or thought would be happily welcome.

• RTSP to RTMP Youtube Live only displays online for few seconds

  2 juin 2016, par Poison

  I’m trying to get the feed from an IP camera to Youtube Live. Simple enough uh.

  The command I’m using is the usual :

  ffmpeg -i rtsp://user:pass@ip:port/videoMain -f flv -r -s -an rtmp://a.rtmp.youtube.com/live2/per-sonal-code

  What happens

  Live Youtube receives the signal and says its healthy, after two or less seconds a red box appears saying they’re not receiving my signal. After that it displays "No signal". Webcam image is never shown.

  What I’ve tried

  Different parameters (-re, -rtsp_transport tcp, -s 640x480, -g 30, -r 30 ..) and different combinations of them, plus different resolutions, different buffer sizes and stream sizes, and different Ingestion settings on Youtube.

  Followed different very basic stuff tutorials.

  I’ve done it with ffmpeg in Windows 7 and Ubuntu 16.04, different networks (home and work), checked for possible port problems,...

  What confuses me

  Using streaming software like XSplit, or Manycam it actually works on the same computers !
  Also using the different command combinations, Youtube always receives the signal and its healthy before changing and displaying "No signal", its not complaining about low bitrate, or wrong format like I’ve seen in the different tutorials.

  I need to create two different streams for two cams, so ideally I’d prefer to use ffmpeg. However if anyone knows a software that can do this, please tell me. I’ve been stuck with this long enough !

  Thanks.

• FFMPEG, Blur an area of a video using Image Select Areas Plugin

  12 juillet 2016, par Drupalist

  I am building an online video editor. I need to allow the users to blur an area of movies. This must be done graphically, I mean user should be able to select an area of a video, using an screenshot, then the selected area must be blurred. Some thing like this

  

  Is there anyway to map this selected area dimension and its distance from borders to the real values that must be applied to the video ?

  I mean four numbers, width, length, top, left will be provided using this plug in and I need to use these numbers to blur an area of videos.

  I take an screenshot of video. In order to keep the aspect ratio, I will fix the width to 800px and let the height to be scaled up/down. It is clear that the width, length, top, left of the selected area of the screenshot is a factor of the width, length, top, left of the area that must be blurred in video. but I don’t know how to get this factor. Besides that I don’t know how to get the video resolution.

  Thanks in advance.

  ---

  Update

  This is my PHP code that gets the selected area dimensions and offsets

  $iLeft = $_POST['left'];
  
  $iTop = $_POST['top'];
  
  $iWidth = $_POST['width'];
  
  $iHeight = $_POST['height'];
  
  exec('ffmpeg -i '.$url.' -filter_complex "[0:v]scale=iw*sar:ih,setsar=1,split[bg][bb];[bb]crop='.$iWidth.'*iw/800:iw*'.$iHeight.'/800:'.$iWidth.'*iw/800:'.$iHeight.'*iw/800,boxblur=10[b0];[bg][b0]overlay='.$iLeft.'*W/800:'.$iTop.'*W/800"" '.$name.' > block.txt 2>&1');

  $iLeft, $iTop, $iWidth, $iHeight are the left, top, width and height of the selected area via the image plugin.

  It blurs many selected areas very well, but areas like this

  

  The Image Left, Top, Width, Height is 257,  39.26666259765625,  10,  391

  don’t get blurred. Also a video with Dimension 207x207 didn’t get blurred as well.