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• ffmpeg is looping / hanging up

  18 mars 2017, par Zara Rebecka Elisabeth Zentio

  I have a video that i created from 3 other videos (merged them with FFMPEG).
  Video Plays fine, but when i try to also add an watermark overlay on the video file i created it start to loop. And if i force it to close the output will be of one movie only.

  I have 3 video files they have diffrent ScreenResulutions.
  I merg those 3 video files in FFMPEG with this command via commandline

  ffmpeg -i  "concat:intermediate1.ts|intermediate2.ts|intermediate3.ts" -c copy -bsf:a aac_adtstoasc myoutputfile.mp4

  The out put works fine all 3 movies are merged, and i can play it like normal.

  Now i try to ad a water mark to this new created video file.

  ffmpeg -i mainmovie.ts -i mywatermark.png -filter_complex "overlay=10:10:enable='lt(mod((t\\),20),7)'" WatermarkedVideoFile.mp4

  The issue here is that it starts to loop seems like it hangs on the first 6 secounds and this seems to be the video that was in intermediate1.ts so i think the issue is that the 3 files i merged to one video file may have diffrent Resulutions and this is why the overlay script dont work proper.

  So my question is can i re-encode it somehow and force it so it will have same resulution while keeping aspect ratio ?

• mp4 files / SSTS info

  3 avril 2017, par Thomas

  I am trying to find the fastest way to get a list of all I-frames in a movie.

  So far, I tried ffprobe, but it is quite slow and I have been looking for a faster solution.

  The other option I found is using the mp4parser tool ; it outputs a file with this sectio, the SSTS info :

  -------------------------------------------------------------------------
  
  /moov/trak/mdia/minf/stbl/stss                              @ 0x1c152d8
  
    Box size: 0x44    version: 0x0    flags: 0x0
  
    entry_count:              0xd
  
      sample_number:
  
       0x1    0x12d    0x259    0x385    ....

  I can see that I have 13 I frames and they’re spaced 300 frames apart (from the 4 values displayed)

  Is the spacing of I frames constant through movies ? or do I need to write my own SSTS parser to get the whole list ?

• How to stream to a element using fluent-ffmpeg

  19 mai 2017, par Lukas

  I am writing on an electron application and I am trying to use fluent-ffmpeg to create a streaming server and use a <video></video> element to consume that stream. I wonder how to set up fluent-ffmpeg and the <video></video> using flowplayer like this :

  Server :

  const express = require('express');
  
  const ffmpeg = require('fluent-ffmpeg');
  
  
  
  const app = express();
  
  
  
  app.use(express.static(__dirname + '/flowplayer'));
  
  
  
  app.get('/', function(req, res) {
  
      res.send('index.html');
  
  });
  
  
  
  app.get('/video/:filename', function(req, res) {
  
      res.contentType('flv');
  
      // make sure you set the correct path to your video file storage
  
      const pathToMovie = '/Users/luke/Movies/' + req.params.filename;
  
      const proc = ffmpeg(pathToMovie)
  
      // use the 'flashvideo' preset (located in /lib/presets/flashvideo.js)
  
          .preset('divx')
  
          // setup event handlers
  
          .on('end', function() {
  
              console.log('file has been converted succesfully');
  
          })
  
          .on('error', function(err) {
  
              console.log('an error happened: ' + err.message);
  
          })
  
          // save to stream
  
          .pipe(res, {end:true});
  
  });
  
  
  
  app.listen(4000);

  Webseite with <video></video> element :

    
  
      
  
      <code class="echappe-js">&lt;script src=&quot;https://code.jquery.com/jquery-1.11.2.min.js&quot;&gt;&lt;/script&gt;
      
  &lt;script src='http://stackoverflow.com/feeds/tag/flowplayer-7.0.4/flowplayer.min.js'&gt;&lt;/script&gt;
  
        
  &lt;script&gt;<br />
  
      require('./ffmpeg-server.js');<br />
  
    &lt;/script&gt;
  

  The main problem I see right now is to find a way to set up the right settings for ffmpeg (currently I am using the divx preset together with the video type video/mpeg4 in the HTML which (of course) does not work.