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• FFmpeg : Create a Video Slideshow from PNG Images for MS PowerPoint

  20 septembre 2016, par Klaidonis

  I am using FFmpeg on Windows 7 to create a video from PNG image sequence for Microsoft PowerPoint.

  The best results I have achieved so far, is by using the following command :

  ffmpeg -framerate 10 -start_number 3 -i .\folder\name_%d.png -q:v 0 -c:v libx264 -pix_fmt yuv420p output-video.avi

  It seems perfect, 50 images of total size 30 MB are converted into 200 KB video with no loss in the quality. Placing it in PowerPoint also seems right, but there is a slight color shift (yellow appears darker and possibly more orangish). By using some other conversion options, I obtained a video in PowerPoint where the first image of the video (like album cover art) is exactly as the original but the rest of the video plays with the mentioned color shift.

  When I play this file in VLC, it’s good. Although, if in the settings "Use hardware YUV->RGB conversions" is enabled, colors appear a bit washed out, and white color is a bit gray.

  I also tried to convert the images to a GIF file and at first it seems good but outer edges and numbers from the left and top side are blurred, and the background has turned from white to a bit gray color, although, white segments not on the background are white. The output size is 18 MB. I ended up with a way better GIF 600 KB by converting from the first video file ; just it is slightly more dotted, and the background again is grayish.

  ffmpeg -i output-video.avi output-video.gif

  Could someone help ?

• FFmpeg works out mp3 duration with file input, but fails with pipe ?

  16 août 2012, par user1599160

  I am trying to get PCM data from mp3's using ffmpeg, but the files are stored on a database, gridfs, so I am trying to use pipes to give ffmpeg the data with some sucess, however there is one file which ffmpeg handles correctlt if fed the filename as an input, and incorrectly when given the file as a pipe :( any idea why ?

  ffmpeg -i - -f s16le -acodec pcm_s16le output.raw < testMp3s/test-corrupt.mp3 

  gives

  ffmpeg version 0.11.1 Copyright (c) 2000-2012 the FFmpeg developers
  
  built on Jun  9 2012 13:50:13 with gcc 4.7.0 20120505 (prerelease)
  
  configuration: --prefix=/usr --enable-libmp3lame --enable-libvorbis --enable-libxvid --        enable-libx264 --enable-libvpx --enable-libtheora --enable-libgsm --enable-libspeex -- enable-postproc --enable-shared --enable-x11grab --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libschroedinger --enable-libopenjpeg --enable-librtmp --enable-libpulse --enable-libv4l2 --enable-gpl --enable-version3 --enable-runtime-cpudetect --  disable-debug --disable-static
  
  libavutil      51. 54.100 / 51. 54.100
  
  libavcodec     54. 23.100 / 54. 23.100
  
  libavformat    54.  6.100 / 54.  6.100
  
  libavdevice    54.  0.100 / 54.  0.100
  
  libavfilter     2. 77.100 /  2. 77.100
  
  libswscale      2.  1.100 /  2.  1.100
  
  libswresample   0. 15.100 /  0. 15.100
  
  libpostproc    52.  0.100 / 52.  0.100
  
  [mp3 @ 0x16d7100] Unknown attached picture mimetype: JPG, skipping.
  
  [mp3 @ 0x16d7100] max_analyze_duration 5000000 reached at 5015510
  
  [mp3 @ 0x16d7100] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, mp3, from 'pipe:':
  
  Metadata:
  
  album           : FreshNewMusik.Com
  
  encoded_by      : iTunes 10.6.3
  
  title           : No Lie (Freestyle)
  
  artist          : Lil Wayne
  
  album_artist    : Lil Wayne
  
  genre           : Hip-Hop/Rap
  
  TT3             : twitter.com/jakejarvis
  
  date            : 2012
  
  Duration: N/A, start: 0.000000, bitrate: 320 kb/s
  
  Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16, 320 kb/s

  Yet

  ffmpeg -i testMp3s/test-corrupt.mp3 -f s16le -acodec pcm_s16le output.raw 

  gives

  ffmpeg version 0.11.1 Copyright (c) 2000-2012 the FFmpeg developers
  
  built on Jun  9 2012 13:50:13 with gcc 4.7.0 20120505 (prerelease)
  
  configuration: --prefix=/usr --enable-libmp3lame --enable-libvorbis --enable-libxvid --    enable-libx264 --enable-libvpx --enable-libtheora --enable-libgsm --enable-libspeex --enable-postproc --enable-shared --enable-x11grab --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libschroedinger --enable-libopenjpeg --enable-librtmp --enable-libpulse --enable-libv4l2 --enable-gpl --enable-version3 --enable-runtime-cpudetect --disable-debug --disable-static
  
  libavutil      51. 54.100 / 51. 54.100
  
  libavcodec     54. 23.100 / 54. 23.100
  
  libavformat    54.  6.100 / 54.  6.100
  
  libavdevice    54.  0.100 / 54.  0.100
  
  libavfilter     2. 77.100 /  2. 77.100
  
  libswscale      2.  1.100 /  2.  1.100
  
  libswresample   0. 15.100 /  0. 15.100
  
  libpostproc    52.  0.100 / 52.  0.100
  
  [mp3 @ 0xf33100] Unknown attached picture mimetype: JPG, skipping.
  
  [mp3 @ 0xf33100] max_analyze_duration 5000000 reached at 5015510
  
  [mp3 @ 0xf33100] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, mp3, from 'testMp3s/test-corrupt.mp3':
  
  Metadata:
  
  album           : FreshNewMusik.Com
  
  encoded_by      : iTunes 10.6.3
  
  title           : No Lie (Freestyle)
  
  artist          : Lil Wayne
  
  album_artist    : Lil Wayne
  
  genre           : Hip-Hop/Rap
  
  TT3             : twitter.com/jakejarvis
  
  date            : 2012
  
  Duration: 00:02:33.86, start: 0.000000, bitrate: 320 kb/s
  
  Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16, 320 kb/s

  How do I get the duration with the pipe ? (the data is available on memory in a python app)

• Fluent-ffmpeg "not a suitable output format"

  5 septembre 2015, par J4G

  I’m using the fluent-ffmpeg module for Node.js to convert audio files. I have a .mp3 file that I’d like to convert to .wma

  Here’s what that looks like :

  var proc = new ffmpeg({
  
     source: 'file.mp3',
  
     nolog: false
  
  }).toFormat('wma')                                                
  
    .saveToFile('file.wma', function(stdout, stderr)
  
  {                                                 
  
      console.log(stderr);
  
  });

  Unfortunately, I get the error :

  Requested output format 'wma' is not a suitable output format

  This is the entire error log :

  ffmpeg version 0.8.9-4:0.8.9-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
  
    built on Nov  9 2013 19:25:10 with gcc 4.6.3
  
  *** THIS PROGRAM IS DEPRECATED ***
  
  This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
  
  Input #0, mp3, from 'song_downloads/You Suffer.mp3':
  
    Metadata:
  
      title           : You Suffer
  
      artist          : Napalm Death
  
      album           : Scum
  
      genre           : Death Metal
  
      track           : 12
  
      date            : 1987
  
    Duration: 00:00:04.98, start: 0.000000, bitrate: 381 kb/s
  
      Stream #0.0: Audio: mp3, 44100 Hz, stereo, s16, 193 kb/s
  
  Requested output format 'wma' is not a suitable output format

  I know this isn’t an ffmpeg issue because

  ffmpeg -i file.mp3 file.wma

  Works fine. Any ideas ?