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• Convert .avi to .gif with ffmpeg with good quality AND subtitles

  1er décembre 2015, par Stergios Marias

  I want to use ffmpeg to convert .avi to .gif with good quality and subtitles.

  Now, I use this script to convert from .avi to .gif with good quality :

  ffmpeg -v warning -ss 10:00 -t 5 -i input.avi -vf "fps=15,scale=420:-1:flags=lanczos,palettegen" -y palette.png
  
  ffmpeg -v warning -ss 10:00 -t 5 -i input.avi -i palette.png -lavfi "fps=15,scale=420:-1:flags=lanczos [x]; [x][1:v] paletteuse" -y output.gif

  I generate a palette and then using it to output the gif.

  Then I am using this script to add subtitles to gif :

  ffmpeg -v warning -i output.gif -vf "ass=subtitles.ass" -y outputWithSubs.gif

  All that works just fine. The problem is that the first script gives me good quality without subtitles and the second gives me subtitles without good quality.

  When I am trying to combine them with this script :

  ffmpeg -v warning -ss 10:00 -t 5 -i input.avi -vf "fps=15,scale=420:-1:flags=lanczos,palettegen" -y palette.png
  
  ffmpeg -v warning -ss 10:00 -t 5 -i input.avi -i palette.png -vf "ass=subtitles.ass" -lavfi "fps=15,scale=420:-1:flags=lanczos [x]; [x][1:v] paletteuse" -y output.gif

  I am getting this error :

  Filtergraph 'ass=subtitles.ass' was specified through the -vf/-af/-filter option for output stream 0:0, which is fed from a complex filtergraph.
-vf/-af/-filter and -filter_complex cannot be used together for the same stream.

  Is there any way that I could combine good quality and subtitles at the same time ?

• Anomalie #3577 : Couleurs des boutons non accessibles

  2 novembre 2015, par chris gaillard

  Par défaut
  /* Ligne 1631 */
  .formulaire_spip .submit, .bouton_action_post .submit
  background-color : #c5e41c ; color : #819900 ;
  Il faudrait mettre color :#3B4500 pour rester dans la même tonalité tout en étant accessible.
  http://www.snook.ca/technical/colour_contrast/colour.html#fg=3B4500,bg=C5E41C

  Sur le hover
  /* Ligne 1633 */
  .formulaire_spip .submit:hover, .bouton_action_post .submit:hover
  background-color : #9dba00 ; color : #ffffff ;

  Il faudrait mettre background-color :#4C5A00
  http://www.snook.ca/technical/colour_contrast/colour.html#fg=FFFFFF,bg=4C5A00

• ffmpeg creating mp4 vs mp4

  23 octobre 2015, par user1207446

  I have two mp4 files. One of them was given to me and plays well under mediawiki (using the MediawikiPlayer extension). The other I created from a WMV file and it does not play. When I look at the two files through the eyes of ffprobe, they appear to be very different. The working file returns this :

  Metadata:
  
    major_brand     : mp42
  
    minor_version   : 0
  
    compatible_brands: mp42isomavc1
  
    creation_time   : 2013-12-28 20:25:51
  
    encoder         : HandBrake 0.9.9 2013052900
  
  Duration: 00:00:17.05, start: 0.000000, bitrate: 957 kb/s
  
    Chapter #0:0: start -0.066733, end 17.017000
  
    Metadata:
  
      title           : Chapter 1
  
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt709), 704x480 [SAR 10:11 DAR 4:3], 824 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 180k tbc (default)
  
    Metadata:
  
      creation_time   : 2013-12-28 20:25:51
  
      encoder         : JVT/AVC Coding
  
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
  
    Metadata:
  
      creation_time   : 2013-12-28 20:25:51
  
    Stream #0:2(und): Subtitle: mov_text (text / 0x74786574), 0 kb/s
  
    Metadata:
  
      creation_time   : 2013-12-28 20:25:51

  The non-working produces this :

  Metadata:
  
    major_brand     : isom
  
    minor_version   : 512
  
    compatible_brands: isomiso2mp41
  
    encoder         : Lavf55.0.100
  
  Duration: 00:05:25.79, start: 0.033333, bitrate: 1331 kb/s
  
    Stream #0:0(eng): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 704x528 [SAR 1:1 DAR 4:3], 1198 kb/s, 25 fps, 25 tbr, 12800 tbn, 25 tbc (default)
  
    Metadata:
  
      handler_name    : VideoHandler
  
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
  
    Metadata:
  
      handler_name    : SoundHandler

  What ffmpeg options do I need to supply to convert my wmv file to an mp4 file like the first of those listed here (the working one) ?

  Update : 2015-10-23, here is the full output from ffmpeg for the non-working file :

  E:\>ffmpeg -i non-working.mp4
  
  ffmpeg version N-71329-g235589e Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.9.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libblu
  
  ray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enab
  
  le-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --ena
  
  ble-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --ena
  
  ble-decklink --enable-zlib
  
    libavutil      54. 22.101 / 54. 22.101
  
    libavcodec     56. 34.100 / 56. 34.100
  
    libavformat    56. 30.100 / 56. 30.100
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 13.101 /  5. 13.101
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'non-working.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2mp41
  
      encoder         : Lavf55.0.100
  
    Duration: 00:10:12.94, start: 0.033333, bitrate: 1324 kb/s
  
      Stream #0:0(eng): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 704x528 [SAR 1:1 DAR 4:3], 1191 kb/s, 25 fps, 25 tbr, 12800 tbn, 25 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  At least one output file must be specified