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• Async Javascript function returns undefined

  14 avril 2018, par Leon Wright

  I am trying to run this function but the it keeps returning undefined when I explicitly hardcode the return value.

  const splitVideo = async (sid, video, part) => {
  
      let framesLocation =`${process.cwd()}/${dirs.videoFrames}/${sid}_${part}`;
  
  
  
      console.log(fs.existsSync(framesLocation));
  
  
  
      if(!fs.existsSync(framesLocation)) {
  
          console.log("making dir");
  
          f.s.mkdirSync(framesLocation);
  
      }
  
  
  
      ffmpeg(video)
  
          .on('end', () => {
  
               return "done";
  
           })
  
           .on('error', (err) => {
  
               throw err;
  
           })
  
           .screenshots({
  
                timestamps: [1,2],
  
                filename: `${sid}_${part}/frame-%s.png`,
  
                folder: `${process.cwd()}/${dirs.videoFrames}`
  
           });
  
  };

  Please help this is very frustrating.

• FFMPEG works in command line but not in exec(), it returns 127

  26 février 2015, par Felipe Schenone

  The command is

  ffmpeg -i path/to/video.avi path/to/video.mpg

  and it works fine from the command line. However, when I call it with PHPs exec(), the return value is 127, it doesn’t seem to detect FFMPEG. What am I doing wrong ? I’m in localhost and the safe mode is off, but I’m new to both FFMPEG and exec(), so it may be a noob mistake. Thanks in advance.

• How to do real-time video streaming frame by frame in python ?

  4 septembre 2018, par Leo

  What I need is to readin one frame of a video, then send this frame as a frame in video, like P-frame, to the server, and server decode it based on the information of the frames it received before this frame.(So only the first frame is sent as complete I-frame, the rest are just P-frame to save bandwidth)

  Then I need to do some real time operation on this frame.

  But I try ffmpeg’s and opencv’s built in streaming protocal, it can only save a complete video file. But I need to do some real time manipulate as soon as I receive one fram, so I cant wait till I have received the whole file.

  So what package should I use ? Or there is not existing lib/software that could do this ?