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• How to use palettegen and paletteuse filters with FFmpeg in C++ ?

  11 janvier 2023, par Olaf Japp

  I want to create an animated gif in a QT project.
When I scale the a QImage to AV_PIX_FMT_RGB8 directly the output looks awfull with flickering artifacts and when I scale to AV_PIX_FMT_YUV420P in between the output is dithered which does not look much better.

  


  I found out that ffmpeg is able to produce a palette file using a filter called palettegen and then convert a movie to gif using this palette.

  


  Is there any sample c++ file out which I could use for my project or does anybody have a clue who to use these filters in code ?

  


• Encoding failed during converting and saving video using php-ffmpeg in laravel

  6 octobre 2020, par mohammadreza mardani

  i'm using https://github.com/PHP-FFMpeg/PHP-FFMpeg package to convert user video uploads to mp4 format, note that I'm using Laravel framework for development process.
  
But I'm facing error for this and Im not really sure what im doing wrong because all it says is that Encoding is failed. I attached the errors image below you can see that at the bottom.

  



  This is my function which handles user uploads :

  



  public function upload()
    {
        $this->putVideoIntoStorage();
        $this->ffmpeg->saveVideo($this->storageManager->getAbsolutePathOf($this->video->getClientOriginalName()));

        return $this->saveVideoIntoDatabase();
    }



  



  This is the function which handles saving and converting video to mp4 using php-ffmpeg

  



   public function saveVideo(String $path)
    {

        $ffmpeg = FFMpeg::create([
            'ffmpeg.binaries' => config('services.ffmpeg.ffmpeg_path'),
            'ffprobe.binaries' => config('services.ffmpeg.ffprobe_path'),
            'timeout'          => 3600, // The timeout for the underlying process
            'ffmpeg.threads'   => 12,   // The number of threads that FFMpeg should use
        ]);


        $video = $ffmpeg->open($path);

        $video->save(new X264(), 'video.mp4');
    }



  



  This is the error im getting : Errors Image
  
I can provide more details if you need just ask me, I would be really glad if someone can help me through this.

  


• AE per frame rendering FFMPEG forming to video

  9 février 2018, par Deckard Cain

  I’m trying to setup an automated per frame rendering system using After Effects and FFMPEG. The idea here is that my slave nodes (running AE), will generate the frames and save them immediately to a Samba share (this way I can team multiple slaves together to tackle the same project file and we aren’t writing an 8GB AVI file, then compressing and deleting it when we could just render 300MB of frames and form it).

  The database and Samba share are running on FreeBSD. This machine will then take those frames and use FFMPEG to combine them into an MP4 video.

  The issue that I’m running into, is that when I render out the After Effects project file directly to an AVI file (one slave, no individual frame rendering), the video length is 1:31. When I render out the exact same project file into individual frames, then run it through FFMPEG to combine and compress them, the output is 1:49.

  I have tried a billion different things to make the length of the video the same, but can’t seem to make it so :/

  aerender.exe -mp -project %PROJECTFILE% -comp %COMPOSITION% -output [########].jpg

  ^Keep in mind, there may be 99999999 frames, or as little as 1 that needs to be rendered (if we need to re-render a specific section because of an asset change)

  ffmpeg -nostdin -i %FRAMELOCATION% -c:v libx264 -preset veryfast -an -y outputVideo.mp4