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• FFMPEG : Incompatible pixel format 'rgb24' for codec 'gif', auto-selecting format 'rgb8'

  30 avril 2020, par Alexander Korzhykov

  I use ffmpeg to record xvfb desktop with 24 bit color depth and save it in gif format (and then I pipe it to AWS so you can replace the ' - ' symbol with a filename.gif in the end of the command, it doesn't affect this issue) :

  



  ffmpeg -f x11grab -video_size 800x600 -r 30 -i :99.0 -f gif -pix_fmt rgb24 -t 5 -


  



  However, I always get the warning :

  



  


  Incompatible pixel format 'rgb24' for codec 'gif', auto-selecting
 format 'rgb8'

  


  



  Which leads to incorrect color reproduction. I tried it both on Windows and Ubuntu Docker container, both pre-compiled and from source, from repository with last commits, but no luck. Also I've seen in the other people's logs that they use --pix_fmt rgb24 or bgr24 and it works just fine.

  



  So the question is : is there anything I need to install or configure in order to use rgb24 with gif encoder ? Or maybe there is a workaround like converting it to another format first ?

  



  Here is the part of my output :

  



  ffmpeg version git-2017-08-18-f386dd7 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609
  configuration: --enable-gpl --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-version3 --enable-libxcb
  libavutil      55. 74.100 / 55. 74.100
  libavcodec     57.102.100 / 57.102.100
  libavformat    57. 76.100 / 57. 76.100
  libavdevice    57.  7.100 / 57.  7.100
  libavfilter     6. 99.100 /  6. 99.100
  libswscale      4.  7.102 /  4.  7.102
  libswresample   2.  8.100 /  2.  8.100
  libpostproc    54.  6.100 / 54.  6.100


Input #0, x11grab, from ':99.0':
  Duration: N/A, start: 1503077459.413864, bitrate: N/A
    Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1024x768, 30 fps, 1000k tbr, 1000k tbn, 1000k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> gif (native))
Press [q] to stop, [?] for help
Incompatible pixel format 'bgr24' for codec 'gif', auto-selecting format 'rgb8'


Output #0, gif, to 'pipe:':
  Metadata:
    encoder         : Lavf57.76.100
    Stream #0:0: Video: gif, rgb8, 1024x768, q=2-31, 200 kb/s, 30 fps, 100 tbn, 30 tbc
    Metadata:
      encoder         : Lavc57.102.100 gif


  



  PS : the only workaround I've found is to split input video into jpegs and pipe them to ImageMagick which then concatenates jpegs to gif. This is extremely slow process and increases render time x20 times.

  


• Live encoding with FFmpeg , decklink and pipe [duplicate]

  5 novembre 2016, par SKALIS

  This question already has an answer here :

  • Which pixel format for web mp4 video ?
    
    1 answer
    

  What is the best way to get live video input from a Blackmagic Decklink card and get it encoded with an external encoder (NvEncoder)

  I try :

  mkfifo output.yuv 
  
  ffmpeg  -f decklink  -r 30000/1000 -pix_fmt uyvy422  -i "DeckLink Mini Recorder 4K@24"  output.yuv 
  
  & NvEncoder -i output.yuv -pix_fmt yuv420p -bitrate 21M -fps30 output.ts

  Problem seems that the NvEncoder cannot take the uyvy422 format, so can I change that to yuv420p when capturing and before sending it trough the pipe ?

  The decklink card only can give me uyvy422

• How to add creation complete event after converting wav format to mp3 format using ffmpeg in Actionscript 3 ?

  31 mai 2016, par Ashish

  I am using the following codes to convert wav file format to mp3 file format using ffmpeg :

  private var info:NativeProcessStartupInfo = new NativeProcessStartupInfo();
  
  private var originalAudio:String = "C:\Users\User_Name\Desktop\test.wav";
  
  info.executable = File.applicationDirectory.resolvePath("assets\\nativefiles\\ffmpeg.exe");
  
  private var args: Vector.<string> = new Vector.<string>();
  
  args.push("-i", originalAudio, "-vn", "-ar", "44100", "-ac", "2", "-ab", "192", "-acodec", "libmp3lame", "-f", "mp3", (tempDir.nativePath + '\\' + audioId + '.mp3'));
  
  info.arguments = args;
  
  private var nativeProcess:NativeProcess = new NativeProcess();
  
  nativeProcess.start(info);
  
  nativeProcess.addEventListener(Event.COMPLETE , onComplete);
  
  
  
  protected function onComplete(event:Event):void
  
  {
  
      trace("Conversion Completed");
  
  }
  
  </string></string>

  But problem is that I am unable to trace the complete event control after file conversion. I have already added a complete event on nativeprocess (i.e nativeProcess.addEventListener(Event.COMPLETE , onComplete);
  but the control not coming in to the function onComplete after conversion.

  So any body have an idea why the control not coming into the function or how to add event listener to trace complete event function.