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• Why does moviepy complain about bitrate while generating audiofile ?

  11 janvier 2017, par Roman

  I have just try to use moviepy library for the first time. Generation of movies from numpy arrays was really simple, intuitive and worked out of box. This is what I tried :

  from moviepy.editor import VideoClip
  
  import numpy as np
  
  
  
  def make_frame(t):
  
  
  
      val = int(255.0*(t/3.0))
  
  
  
      ls = []
  
      for height in range(100):
  
          row = []
  
          for width in range(300):
  
              row.append([val,0,0])
  
          ls.append(row)
  
      frame = np.array(ls)
  
      return frame
  
  
  
  animation = VideoClip(make_frame, duration = 3)
  
  
  
  animation.write_gif('first_try.gif', fps=24)
  
  animation.write_videofile('first_try.mp4', fps=24)

  Then I wanted to use moviepy to generate sound. In theory it should work in a very similar way. Here is what I tried :

  from moviepy.editor import AudioClip
  
  import numpy as np
  
  
  
  make_frame = lambda t : 2*[ np.sin(404 * 2 * np.pi * t) ]
  
  clip = AudioClip(make_frame, duration=5)
  
  
  
  clip.write_audiofile('sound.mp4')

  However, I got an error message :

  [MoviePy] Writing audio in sound.mp4
  
  |----------| 0/111   0% [elapsed: 00:00 left: ?, ? iters/sec]Traceback (most recent call last):
  
    File "sound.py", line 9, in <module>
  
      clip.write_audiofile('sound.mp4')
  
    File "<string>", line 2, in write_audiofile
  
    File "/usr/local/lib/python2.7/dist-packages/moviepy/decorators.py", line 54, in requires_duration
  
      return f(clip, *a, **k)
  
    File "/usr/local/lib/python2.7/dist-packages/moviepy/audio/AudioClip.py", line 204, in write_audiofile
  
      verbose=verbose, ffmpeg_params=ffmpeg_params)
  
    File "<string>", line 2, in ffmpeg_audiowrite
  
    File "/usr/local/lib/python2.7/dist-packages/moviepy/decorators.py", line 54, in requires_duration
  
      return f(clip, *a, **k)
  
    File "/usr/local/lib/python2.7/dist-packages/moviepy/audio/io/ffmpeg_audiowriter.py", line 162, in ffmpeg_audiowrite
  
      writer.write_frames(chunk)
  
    File "/usr/local/lib/python2.7/dist-packages/moviepy/audio/io/ffmpeg_audiowriter.py", line 122, in write_frames
  
      raise IOError(error)
  
  IOError: [Errno 32] Broken pipe
  
  
  
  MoviePy error: FFMPEG encountered the following error while writing file sound.mp4:
  
  
  
  Invalid encoder type 'libx264'
  
  
  
  
  
  The audio export failed, possily because the bitrate you specified was two high or too low for the video codec.
  
  </string></string></module>

  Does anybody know what this error means and how this problem can be resolved ?

• 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.

• ffmpeg mp4 file is not valid

  10 mars 2014, par Flash Thunder

  I was looking for answer on Internet but, didn't find any...

  Got 3 movies, all made by ffmpeg from separate frames in png files with command :

  ffmpeg -r 100 -qscale 2 -i input/%06d.png output/movie.mp4

  Two of them work perfectly... Windows Media Player and all others see it as correct format..., but one of them not. Only VLC can play it, all other players say that it is unknown format. It probably has something to do with size of images. Would like to know what are the criteria... what size should it have... why one is working and other is not...

  Sizes are :

  1. 1600x1570 - works fine
  2. 1880x616 - works fine
  3. 1891x725 - doesn't work...

  This is really weird, because fullhd has width of 1920, so all above are lower...

  All images are made by PHP with gdlib, all saved the same method... it is not the problem of count, because no matter if I get only first 100 frames, or whole movie, it still doesn't work... only the last one. Any ideas what could possibly be wrong ?

  Complete FFMPEG output (for 200 frames) :

  FFmpeg version SVN-r0.5.10-4:0.5.10-1, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  
    configuration: --extra-version=4:0.5.10-1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libdirac --enable-libgsm --enable-libopenjpeg --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --disable-stripping --disable-vhook --enable-runtime-cpudetect --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libfaad --enable-libdc1394 --enable-shared --disable-static
  
    libavutil     49.15. 0 / 49.15. 0
  
    libavcodec    52.20. 1 / 52.20. 1
  
    libavformat   52.31. 0 / 52.31. 0
  
    libavdevice   52. 1. 0 / 52. 1. 0
  
    libavfilter    0. 4. 0 /  0. 4. 0
  
    libswscale     0. 7. 1 /  0. 7. 1
  
    libpostproc   51. 2. 0 / 51. 2. 0
  
    built on Feb 16 2013 09:22:58, gcc: 4.4.5
  
  Input #0, image2, from 'input/%06d.png':
  
    Duration: 00:00:02.01, start: 0.000000, bitrate: N/A
  
      Stream #0.0: Video: png, rgb24, 1891x725, 100 tbr, 100 tbn, 100 tbc
  
  Output #0, mp4, to 'output/movie.mp4':
  
      Stream #0.0: Video: mpeg4, yuv420p, 1891x725, q=2-31, 200 kb/s, 90k tbn, 100 tbc
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
  Press [q] to stop encoding
  
  frame=  201 fps= 14 q=2.0 Lsize=   10032kB time=2.01 bitrate=40886.7kbits/s
  
  video:10030kB audio:0kB global headers:0kB muxing overhead 0.023690%

  PS. Even after converting in different application to FullHD (added black bars), it still doesn't work.