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• Fix nonsense MPEG-4 hwaccel code.

  21 août 2013, par Reimar Döffinger

  Fix nonsense MPEG-4 hwaccel code.
  Issues with the code :
  
  1) The skip_bits_long breaks packed B-frames since we skip
  
  of the packed frame, even for VDPAU.
  
  2) Calling ff_h263_find_resync_marker_reverse is nonsense for MPEG-4,
  
  and for H.263 the only code using this (vaapi_mpeg4) explicitly reverts
  
  this change !
  
  3) mb_x/mb_y are always 0 when vaapi_mpeg4_decode_slice, so doing
  
  computations with them is just obfuscation
  
  4) due to not updating mb_y the code would always go into the error
  
  resilience case, causing nonsense error messages and maybe further
  
  issues.
  While tested to fix the data provided to the decoder in case of
  
  VDPAU so it is the same as for the non-hwaccel code, the VA-API code
  
  was not tested to still work, and adding regression testing even
  
  as a quick hack is much more complicated for it.
  Signed-off-by : Reimar Döffinger <Reimar.Doeffinger@gmx.de>
  

  • [DH] libavcodec/h263dec.c
  • [DH] libavcodec/vaapi_mpeg4.c

• Cannot find ffmpeg when moving the code to a new computer

  20 septembre 2021, par Omersr

  I have a code that works on my computer but when I moved it to a new one it doesn't find the ffmpeg dependency.
It happens on these lines of code :

  


      var videoshow = require('videoshow')
    var image = [{path: './screenshot.jpg'}]
    var videoOption = { 
      loop: 10,
      fps: 25,
      transition: false,
      transitionDuration: 0, // seconds
      videoBitrate: 1024,
      videoCodec: 'libx264',
      size: '640x?',
      audioBitrate: '128k',
      audioChannels: 2,
      format: 'mp4',
      pixelFormat: 'yuv420p'
    }
    //call the videoshow library
     videoshow(image,videoOption).save(filename+"_"+"movie.mp4").on('start',function(command){
         console.log("conversion started" + command)
    }).on('error',function(err,stdout,stderr){
         console.log("some error occured"+ err)
     }).on('end',function(output){
         console.log("conversion complete "+ output)


  


  It throws an error "Cannot find ffmpeg".
I tried to do npm install or npm install ffmpeg but it didn't help.
I think this happens because I don't know how to make dependencies work on a different computer.
Any help would be appreciated !

  


• FFMPEG not working in php code

  19 avril 2015, par User

  I have tried with ffmpeg for video thumbnail creation.
  In windows its working fine, but in Linux(centos) it’s not working.

  i have tried the following command :

   $cmd = "/usr/local/bin/ffmpeg -i  /opt/lampp/htdocs/mydashboard/sites/default/files/content_videos/".$video."
  
  -ss 00:00:01.435 -f image2 -vframes 1     /opt/lampp/htdocs/mydashboard/sites/default/files/content_images/".$videoname."-thumb.jpg";
  
  
  
      echo exec($cmd);

  The abovecommand is working in the Linux command line and thumbnails are creating in destination folder, i have given static video file.

  But the same command is not working as expected in the php script.

  Any help is greatly appreciated.