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• Is it possible to vertically rotate a showwaves (or showfreqs) overlay using ffmpeg ?

  5 février 2019, par Introspectre

  I wish to take a showwaves (or showfreqs) overlay and center it vertically using ffmpeg, e.g.

  ffmpeg -i input.mp3 -filter_complex "[0:a]showspectrum=color=fiery:saturation=2:slide=scroll:scale=log:win_func=gauss:overlap=1:s=960x1080,pad=1920:1080[vs]; [0:a]showspectrum=color=fiery:saturation=2:slide=rscroll:scale=log:win_func=gauss:overlap=1:s=960x1080[ss]; [0:a]showwaves=s=1920x540:colors=B80000|950000|690000:mode=p2p,inflate[sw]; [vs][ss]overlay=w[out]; [out][sw]overlay=0:(H-h)/2[out]" -map "[out]" -map 0:a -c:v libx264 -preset fast -crf 18 -c:a copy output.mkv

  

  As shown above, the showwaves output is centered horizontally. But would it also be possible to have it centered vertically ? Specifically, using a single -filter_complex command argument ?

  I’ve looked through the ffmpeg manual and searched stackoverflow for an answer, but to no avail.

• ffmpeg unrecognized file type

  1er février 2019, par user892134

  I’m using Mac OS and ffmpeg. I’m attempting to convert mp3 to mp4 with image background and overlay audio visualization.
  The below works when converting mp3 to mp4 with image :

  $mp3 = "/Users/vanessa/Downloads/test/Marco.mp3";
  
      $image = "/Users/vanessa/Downloads/test/maxresdefault.jpg";
  
      $video = "/Users/vanessa/Downloads/test/videos/test2.mp4";
  
  
  
    exec("/usr/local/Cellar/ffmpeg/4.1_3/bin/ffmpeg -loop 1 -i $image -i $mp3 -c:v libx264 -c:a aac -strict experimental -b:a 192k -shortest $video 2>&1",$output); 

  I can successfully play test2.mp4. When i attempt to do add an overlay of audio visualization. I can see in get info how it looks in the preview section but when i click on the file it says : File open error:Unrecognized file type

  exec("/usr/local/Cellar/ffmpeg/4.1_3/bin/ffmpeg -y -i $mp3 -loop 1 -i $image -filter_complex '[0:a]showwaves=s=1280x175:colors=White:mode=line,format=yuv420p[v];[1:v][v]overlay=0:200[outv]' -map '[outv]' -pix_fmt yuv420p -map 0:a -c:v libx264 -c:a copy -shortest $video 2>&1",$output); 

  Where did i go wrong ? The player i’m using is Quicktime.

• ffmpeg not generating palettes

  2 décembre 2018, par sk84z

  I downloaded ffmpeg and ran the command found in the documentation to generate palettes :

  ffmpeg -i input.mkv -vf palettegen palette.png

  The only difference being my input was input.mp4 instead of input.mkv.

  No file gets generated. Here’s the console output from PowerShell :

  ffmpeg version 3.4 Copyright (c) 2000-2017 the FFmpeg developers  
  
    built with gcc 7.2.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth --enable-libmfx
  
    libavutil      55. 78.100 / 55. 78.100
  
    libavcodec     57.107.100 / 57.107.100
  
    libavformat    57. 83.100 / 57. 83.100
  
    libavdevice    57. 10.100 / 57. 10.100
  
    libavfilter     6.107.100 /  6.107.100
  
    libswscale      4.  8.100 /  4.  8.100
  
    libswresample   2.  9.100 /  2.  9.100
  
    libpostproc    54.  7.100 / 54.  7.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp41isom
  
      creation_time   : 2018-11-23T23:27:38.000000Z
  
    Duration: 00:00:09.98, start: 0.000000, bitrate: 2784 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 580x328 [SAR 1:1 DAR 145:82], 2699 kb/s, 30 fps, 30 tbr, 30k tbn, 60 tbc (default)
  
      Metadata:
  
        creation_time   : 2018-11-23T23:27:38.000000Z
  
        handler_name    : VideoHandler
  
        encoder         : AVC Coding
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 79 kb/s (default)
  
      Metadata:
  
        creation_time   : 2018-11-23T23:27:38.000000Z
  
        handler_name    : SoundHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> png (native))
  
  Press [q] to stop, [?] for help
  
  Output #0, image2, to 'palette.png':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp41isom
  
      encoder         : Lavf57.83.100
  
      Stream #0:0(und): Video: png, rgba, 16x16 [SAR 1:1 DAR 1:1], q=2-31, 200 kb/s, 30 fps, 30 tbn, 30 tbc (default)
  
      Metadata:
  
        creation_time   : 2018-11-23T23:27:38.000000Z
  
        handler_name    : VideoHandler
  
        encoder         : Lavc57.107.100 png
  
  [Parsed_palettegen_0 @ 00000296510def00] 255(+1) colors generated out of 285516 colors; ratio=0.000893
  
  [Parsed_palettegen_0 @ 00000296510def00] Dupped color: FF000001

  Any ideas ?