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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 in Python Returns Corrupted Video

  11 décembre 2020, par user14210589

  In Python, I run ffmpeg to convert a video to a .mp4 file. However, for some reason, the video it creates is not compatible with anything (I'm pretty sure it's corrupted). The code looks like this :

  


  import os

os.system("ffmpeg -i Images/i1.mov Images/edited.mp4 -loglevel quiet")
os.remove("Images/i1.mov")
os.rename("Images/edited.mp4", "Images/i1.mp4")


  


  However, the video file created doesn't play.
I am getting an error that just says killed. What am I doing wrong ?

  


  Edit : I also tried converting to .WebM rather than .mp4, and it had no effect. (it still gave the same error)

  


• ffprobe returns coded_picture_number with a frame missing

  26 janvier 2018, par Hélder

  While using ffprobe to get the pict_type and coded_picture_number I noticed while doing a for loop in python that one of the coded_picture_number was missing.

  This is the command used :

  ffprobe foreman.m4v -show_frames | grep -E 'pict_type|coded_picture_number' > output.txt

  And I get returned all frame number with exception of one :

  coded_picture_number=290
  
  pict_type=P
  
  coded_picture_number=289
  
  pict_type=B
  
  coded_picture_number=292
  
  pict_type=P
  
  coded_picture_number=291
  
  pict_type=B
  
  coded_picture_number=294
  
  pict_type=P
  
  coded_picture_number=293
  
  pict_type=B
  
  coded_picture_number=297
  
  pict_type=B
  
  coded_picture_number=296

  The total is 297 coded_picture_number, where does the 295 go ? Does anyone know how to get it ? It causes errors in python when taking ranges and trying to read the image from the data frame.

  If it is possible to have a smooth numbering per pict_type would be perfect. Any clue ?