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• I am trying to generate thumbnail by using ffmpeg but I can not define pathways and make my codes work

  17 juillet 2020, par D. Merchant

  Fffmpeg modul is installed in my shared hosting.

  


  

  


  My goal is to get a thumbnail of a video. My codes is in below. I can not make them work. This is my first time I use ffmpeg.

  


  require 'vendor/autoload.php';

$video_path = 'home/sasasasasa/public_html/wp-content/uploads/jvhyicpzxy.mp4';

$ffmpeg = FFMpeg\FFMpeg::create();
$video = $ffmpeg->open($video_path);
$video
    ->frame(FFMpeg\Coordinate\TimeCode::fromSeconds(5))
    ->save('new_preview1.jpg');


  


  When I try the codes in the above, I get this error :

  


  

  


  1- What does 'vendor/autoload.php' pathway mean ? I can not see a folder called "vendor" in my file manager.

  


  2- I've check my ffmpeg folder with this code "exec('which ffmpeg') ;" and it outputs "/usr/bin/ffmpeg". But there is no directory in my file manager like that. After a search, Ive found this directory about ffmpeg : "/perl/usr/lib/perl5/FFmpeg". If I enter this path in my hosting, I can see only "Command.pm" and "Thumbnail.pm". What is my wrong, and how can I make my codes work and have a preview of the video ?

  


• ffmpeg : memory not freed on multi-threaded decoding

  31 mai 2020, par toby_e

  I am developing a video player based on the ffmpeg libraries and have run into a rather strange memory increase or failure to decrease memory when unloading a video file. My code is based on various examples of demuxing, decoding and scaling video and audio frames - but with the excecption that i have put each of these steps into seperate threads to avoid waiting for time-consuming calls. Everything works perfectly, but Visual Studio shows that Process Memory does not decrease when i call the various avclose and avfree calls. My Windows task manager confirms these memory increases that continue into the gigabyes !

  



  My player is roughly made up by two clases with the following calls to the ffmpeg libraries :

  



  —

  



  READER :

  



  Open (on main thread) : avformat_open_input(), avformat_find_stream_info()

  



  Read (on seperate thread) : av_read_frame()

  



  Close (on main thrad) : avformat_close_input()

  



  DECODER :

  



  Open (on main thread) : avcodec_find_decoder(), avcodec_alloc_context3(), avcodec_parameters_to_context(), avcodec_open2()

  



  Decode (on seperate thread) : avcodec_send_packet(), avcodec_receive_frame()

  



  Close (on main thread) : avcodec_free_context()

  



  —

  



  Is threre any issues with opening/closing on the main thread and reading/deconding on other threads ?

  


• Record live stream using ffmpeg as Process in Java

  26 décembre 2020, par Serbroda

  I can not figure out how to start a Process in Java for recording a live stream with ffmpeg.

  



  I've tried several solutions, but my current code looks like this (simplified) :

  



  public void startDownload() {
    String[] processArgs = new String[] {
            "ffmpeg", 
            "-i", 
            "https://bitdash-a.akamaihd.net/content/sintel/hls/playlist.m3u8", 
            "-c", 
            "copy", 
            "-bsf:a", 
            "aac_adtstoasc", 
            "C:\\temp\\test.mp4"
    };
    ProcessBuilder processBuilder = new ProcessBuilder(processArgs);
    try {
        process = processBuilder.start();
        process.wairFor(); // Do I need this? Actually the stream is running forever until I stop it manually.
        BufferedReader br = new BufferedReader(new InputStreamReader(process.getInputStream()));
        String line = null;
        while ((line = br.readLine()) != null) { // this blocks forever
            System.out.println(line);
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
}


  



  The problem is, that something blocks the process from starting. In this example the br.readLine() blocks it forever and I can not get any output from the process.

  



  But after killing the jar / stopping launch config in Intellij, the process begins to work and I have to kill it via task manager.

  



  Running a process that is not recording a live stream like just executing ffmpeg works by the way.

  



  I'm using Windows, JDK 14, IntelliJ.