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  • Kill an unresolved promise (or ignore and move on)

    17 septembre 2017, par Trees4theForest

    Using node child process exec, I’m calling a ffmpeg conversion via a promise that takes a bit of time. Each time the use clicks "next" it starts the FFMpeg command on a new file :

    function doFFMpeg(path){
    
  return new Promise((resolve, reject) => {
    
    exec('ffmpeg (long running command)', (error, stdout, stderr) => {
    
      if (error) {
    
        reject();
    
      }
    
    }).on('exit', (code) => { // Exit returns code 0 for good 1 bad
    
      if (code) {
    
        reject();
    
      } else {
    
        resolve();
    
      }
    
    });
    
  });
    
}

    The problem is, if the user moves on to the next video before the promise is returned, I need to scrap the process and move on to converting the next video.

    How do I either :

    A) (Ideally) Cancel the current promised exec process*
    B) Let the current promised exec process complete, but just ignore that promise while I start a new one.

    *I realize that promise.cancel is not yet in ECMA, but I’d like to know of a workaround — preferably without using a 3rd party module / library.

    Attempt :

    let myChildProcess;
    

    
function doFFMpeg(path){
    

    
  myChildProcess.kill();
    

    
  return new Promise((resolve, reject) => {
    
    myChildProcess = exec('ffmpeg (long running command)', (error, stdout, stderr) => {
    
      if (error) {
    
        reject();
    
      }
    
    }).on('exit', (code) => { // Exit returns code 0 for good 1 bad
    
      if (code) {
    
        reject();
    
      } else {
    
        resolve();
    
      }
    
    });
    
  });
    
}

  • Revision 965af79241 : vp8cx_set_ref : Flush encoder. According to the current API spec we need to call

    14 août 2014, par Dmitry Kovalev

    Changed Paths :
     Modify /examples/vp8cx_set_ref.c



    vp8cx_set_ref : Flush encoder.

    According to the current API spec we need to call vpx_codec_encode() until
    vpx_codec_get_cx_data() returns NULL.

    Change-Id : Ide0c531dc0d453df8ec1edb8acb894856d6cc22e

  • FFmpeg error - "at least one output file must be specified" [closed]

    1er février 2018, par Derrick Tucker
    ffmpeg -ss 0 -i rawvid.flv -t 33 -vf scale=640x480 -b:21504 test.mpg

    When run, this returns "At least one output file must be specified", what am I missing ?

    PS : FFmpeg works fine, and if I remove all of the flags in the statement above, it works.

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