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• ffmpeg setting up in wamp on localhost

  22 mars 2016, par notbugfree

  I have done the following :

  1. Downloaded ffmpeg from http://sourceforge.net/projects/ffmpeg-php/files/

  2. Copied php_ffmpeg.dll from the php5 folder to the

     C:\wamp\bin\php\ext

  3. Copied files from common to the windows/system32 folder

  4. Added the extension=php_ffmpeg.dll to php.ini file
  5. Restarted all services (Apache, PHP...)
  6. enabled extension=php_ffmpeg.dll directive in my php.ini.

  But it still doesn’t show up when I do a php info page. I thought it might have something to do with that fact that I’m using php version 5.3.0. I have googled for a php_ffmpeg.dll for php version 5.3.0 and haven’t had any luck.

• How to stream a wmv file as an mp4 file (convert on the fly) over HTTP using ffmpeg or something similar ?

  8 juin 2016, par Adam Tal

  I understand it’s not possible to use the tag to play a WMV file.

  I thought about the following solution :

  • Streaming a video means sending small chunks of frames and sound
  • Reading a wmv file in chunks is surely possible
  • An html video tag can receive chunks in an mp4/webm/ogg format and display it

  Can I read a WMV file as a Steam and convert in on the fly to output it as if it was an MP4 file ?

  Few points :

  • The technology is not really important. I just have a problem I need to solve.. I would prefer a solution in C# or node.js because those are environments I’m comfortable with but anything else will do.
  • I will be happy to stream the file from a different server as wmv and output it as mp4 but I’m also able to download the file completely to my server and stream it from the local hard drive.
  • The mp4 output is not a must. It can also be webm or ogg (just need the video tag to support it)

• ffmpeg : concat video and audio files

  11 mai 2016, par basilikum

  Is it possible to concatenate multiple files, if some of the files are videos with audio and some are audio only. The end result should look like this :

  --------------------------------------------------------
  
  |###(v/a)### | ### (a) ### | ### (a) ### | ###(v/a)### |
  
  --------------------------------------------------------
  
  
  
  v/a: video + audio
  
  a  : audio only (blank screen)

  I tried to do it with the following command :

  ffmpeg 
  
  -i chunk1.mp4 
  
  -i chunk2.m4a 
  
  -i chunk3.mp4
  
  -filter_complex "[0:v:0] [0:a:0] [1:v:0] [1:a:0] [2:v:0] [2:a:0] concat=n=3:v=1:a=1 [v] [a]"
  
  -map "[v]" -map "[a]" -strict -2 result.mp4

  So I tried to only use the audio track from input 1 ([1:a:0]) but unfortunately, I’m getting this error message :

  Stream specifier ':v:0' in filtergraph description [0:v:0] [0:a:0] [1:v:0] [1:a:0] [2:v:0] [2:a:0] concat=n=3:v=1:a=1 [v] [a] matches no streams.

  I thought that this must be possible somehow, since I can also combine a large audio file and a small video with ffmpeg. The result would then be a video file where the last frame just freezes but the audio still plays along. I would like to achieve the same result with either a frozen last frame or simply a black frames. Is this possible ?