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• ffmpeg concatenation of live streams with different codecs

  14 mai 2015, par ashishgupta_mca

  Great information is given on https://trac.ffmpeg.org/wiki/Concatenate of how to concat two files of different codecs and I tried option "Concat filter" for two files and it works as expected.

  I wish to have the concatenation of live streams from two webcams on timely basis. E.g. first camera live stream will be shown for 60 sec and then second camera live stream for 60 sec and then again first camera live stream for 60 sec.... Process continues

  This is to create concatenation on fly to reduce gaps between two streams switching.

  Is this possible by using ffmpeg concatenation ?

  Any direction will be much appreciated.

  Thanks a lot in advance.

• Ffmpeg for Windowsphone 8

  11 mai 2015, par prakash

  I came across this urls
  1.https://github.com/pinger-inc/FFMPEG_WindowsPhone
  2.https://trac.ffmpeg.org/wiki/CompilationGuide/WinRT

  I am trying to compile ffmpeg for windows phone 8. I able to compile successfully but I am missing the ffmpeg.lib file after compilation. I am trying to compile this because of the windows phone certification issue we faced while submitting to the store.

  "The native API api-ms-win-core-processthreads-l1-1-1.dll:GetProcessTimes() isn’t allowed in assembly FFMPEGRuntime.dll. Update it and then try again."

• FFMPEG image resize not working

  8 décembre 2015, par Soundhar Raj

  FFmpeg version 0.6.5 is installed on my web server.

  In my website mp4 videos allowed to upload, that part is done.
  Now i am working on create a thumbnail of the video and then resize it.

  The following links are I referred.

  https://trac.ffmpeg.org/wiki/Create%20a%20thumbnail%20image%20every%20X%20seconds%20of%20the%20video

  https://trac.ffmpeg.org/wiki/Scaling%20(resizing)%20with%20ffmpeg

  This is the command i used to create a thumbnail from video, this command is working.

  $cmd = "ffmpeg -i test.mp4 -ss 0 -vframes 1 out.png";

  After creating the thumbnail, I tried the following the command to resize it, but this is not working.

  $cmd = 'ffmpeg -i out.png -vf scale=210:-1 output_320x240.png';

  And Some other commands i have tried

  $cmd = "ffmpeg -ss 10 -i test.mp4 -vframes 1 -filter scale=-1:150,crop=200:150 output.jpg";
  
  
  
  $cmd = "ffmpeg -itsoffset -1 -i test.mp4 -vframes 1 -filter:v scale=280:-1 output.jpg";

  In my localhost I used the following command to create thumbnail and resize in a single command, but this is also not working in the server.

  $ffmpeg = 'C:\\ffmpeg\\bin\\ffmpeg';
  
  $video = 'test.mp4';
  
  $cmd = "$ffmpeg -itsoffset -1 -i $video -vframes 1 -filter:v scale=\"210:-1\"  thumbnail.png";

  Thanks to all