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• Unknown input format : 'x11grab'

  5 juillet 2017, par jjh

  guys :

  I have problems when i compile ffmpeg and run ffmpeg in linux.

  My environment :

  1 : ubuntu 17.10_x64_bit(i don’t think the os version is the key)

  2 : gcc (Ubuntu 6.3.0-19ubuntu1) 6.3.0 20170618

  3 : ffmpeg open source code:3.2

  first, i download the source code from ffmpeg official site. I compile this project with there instructions：

  ./configure --prefix=/home/jjh/software/ffmpeg --enable-shared
  
  make
  
  make install

  and it worked without any error except some warning, then i run :

  ./ffmpeg -h

  i make sure that it works and output normally.

  but i want use ffmpeg to grabbing screen. so i use this construction(o) :

  ffmpeg -f x11grab -video_size cif -framerate 25 -i :0.0 /tmp/out.mpg

  then output error :

  Unknown input format: 'x11grab'

  i want to re-compile this project with —enable-x11grab option, btw , so many solution tell me to to this. but when i add this option, i get some errors :

  Invalid option --enable-x11grab

  some people says that i should install some libs :

  libxfixes-dev
  
  sudo apt-get install libxext-dev

  so i installed these libs, but it always show this error. pls help me.

• PHP exec is causing issues in my webservice

  11 novembre 2013, par meda

  Guys I need some help with this

  I am building an android app that uploads a sound file to a server then converts it.
  Then the next step in my app is to populate a spinner using JSON from another script

  Everything works as expected but for some reason I get an JSON parsing error on the next step.
  I made sure the JSON is correct, so the problem is not there.
  You can trust me on that, I debugged this.

  The android error is :

  E/JSON Parser(14625) : Error parsing data org.json.JSONException : Value
   !DOCTYPE of type java.lang.String cannot be converted to JSONObject

  It the JSON script is not even called, because I put some logs to make sure

  It seems like the issue is comming from the webservice instead, particularly the following function

  function ConvertFileToUlaw($input, $output) { 
  
      try {
  
          exec("ffmpeg -i \"$input\" -codec:a pcm_mulaw -f mulaw \"$output\"");
  
         //error_log($output);
  
      } 
  
      catch (Exception $e) {
  
          error_log($e->getMessage());
  
      }
  
  } 

  I call it like this :

  ConvertFileToUlaw($ThreeGpFilePath, $ulawFilePath);

  Now this works fine, and my sound file is converted, but I can get the next script to run without error, unless I comment it out.

  I am stumped at this point, please advice.

• Timecode Burn-In from Source TC

  16 janvier 2024, par filmeschneider

  I'm trying to create a TC Burn-In that correctly displays the source video's TC.

  


  My current FFMPEG filter line is :

  


  -filter_complex "[0:1][0:2] amerge" -preset ultrafast -vf scale=960:540:in_range=tv:out_range=pc,"drawtext=\timecode='00\:00\:00\:00':timecode_rate=25:x=(w-tw)/2:y=h-(2*lh):fontcolor=white@1:fontsize=30:box=1:boxcolor=black@0.6" -c:v libx264 -pix_fmt yuv420p -crf 27 -c:a aac -ar 48000 -b:a 128k

  


  This of course starts the Burn-In at 00:00:00:00, but I'd rather insert the file's TC (in this case, it starts at 10:00:00:00) — data taken from MediaInfo :

  


  Other #1
ID                                       : 1-Material
Type                                     : Time code
Format                                   : MXF TC
Frame rate                               : 25.000 FPS
Time code of first frame                 : 10:00:00:00
Time code of last frame                  : 10:02:34:20
Time code settings                       : Material Package
Time code, stripped                      : Yes
Title                                    : Timecode

Other #2
ID                                       : 0-Source
Type                                     : Time code
Format                                   : MXF TC
Frame rate                               : 25.000 FPS
Time code of first frame                 : 10:00:00:00
Time code of last frame                  : 10:02:34:20
Time code settings                       : Source Package
Time code, stripped                      : Yes

Other #3
Type                                     : Time code
Format                                   : SMPTE TC
Muxing mode                              : SDTI
Frame rate                               : 25.000 FPS
Time code of first frame                 : 10:00:00:00


  


  I have not found a way to make FFMPEG read the TC and use it for the Burn-In. Do any of you guys know how to accomplish this ?

  


  Thanks
Christian