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• Banding/ Trailing while resizing GIF with transparency using FFMPEG

  30 septembre 2019, par Arpit Kumar

  I am trying to resize a gif using ffmpeg. link here

  This is the command for resizing GIF

  ffmpeg -i default.gif -filter_complex "[0:v] scale=320:-1:flags=lanczos,split [a][b]; [a] palettegen=reserve_transparent=on:transparency_color=ffffff [p]; [b][p] paletteuse" resize.gif

  The problem is with the output. The output GIF has huge "banding/ trailing" effect

  Sample output of the file is here Output here

  I am not sure what is it that I am doing wrong and how can I fix this banding/ trailing effect.

  I am using FFMPEG on macOS Mojave, ffmpeg version is 4.1.1. Below is the output of the command

  ffmpeg version 4.1.1 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with Apple LLVM version 10.0.0 (clang-1000.11.45.5)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.1 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/openjdk-11.0.2.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/openjdk-11.0.2.jdk/Contents/Home/include/darwin' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox --disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr
  
    libavutil      56. 22.100 / 56. 22.100
  
    libavcodec     58. 35.100 / 58. 35.100
  
    libavformat    58. 20.100 / 58. 20.100
  
    libavdevice    58.  5.100 / 58.  5.100
  
    libavfilter     7. 40.101 /  7. 40.101
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  3.100 /  5.  3.100
  
    libswresample   3.  3.100 /  3.  3.100
  
    libpostproc    55.  3.100 / 55.  3.100
  
  Input #0, gif, from 'ear_s_01.gif':
  
    Duration: N/A, bitrate: N/A
  
      Stream #0:0: Video: gif, bgra, 640x480, 12.50 fps, 12.50 tbr, 100 tbn, 100 tbc
  
  Stream mapping:
  
    Stream #0:0 (gif) -> scale
  
    paletteuse -> Stream #0:0 (gif)
  
  Press [q] to stop, [?] for help
  
  Output #0, gif, to 'resize.gif':
  
    Metadata:
  
      encoder         : Lavf58.20.100
  
      Stream #0:0: Video: gif, pal8, 320x240, q=2-31, 200 kb/s, 12.50 fps, 100 tbn, 12.50 tbc
  
      Metadata:
  
        encoder         : Lavc58.35.100 gif
  
  [Parsed_palettegen_2 @ 0x7f7f19001180] 255(+1) colors generated out of 91324 colors; ratio=0.002792
  
  [Parsed_palettegen_2 @ 0x7f7f19001180] Dupped color: FF100C0A
  
  frame=   37 fps=0.0 q=-0.0 Lsize=     453kB time=00:00:02.89 bitrate=1283.8kbits/s speed=7.33x    
  
  video:452kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.237091%

• Converting ffmpeg & ffprobe outputs to variables in an ffmpeg AWS Lambda Layer

  7 mars 2019, par Gracie

  I have two tasks I am trying to perform with the ffmpeg AWS Lambda layer.

  1) Convert an audio file from stereo to mono (with ffmpeg)

  2) Get the duration of the audio file and pass the result to a variable (with ffprobe)

  const { spawnSync } = require("child_process");
  
  const { readFileSync, writeFileSync, unlinkSync } = require("fs");
  
  const util = require('util');
  
  var fs = require('fs');
  
  
  
  exports.handler = (event, context, callback) => {
  
  
  
      // Windows 10 ffmpeg command to convert stereo to ffmpeg is
  
      // ffmpeg -i volando.flac -ac 1 volando-mono.flac
  
  
  
      // Convert from stereo to mono
  
      spawnSync(
  
          "/opt/bin/ffmpeg",
  
          [
  
              "-i",
  
              `volando.flac`,
  
              "-ac",
  
              "1",
  
              `/tmp/volando-mono.flac`
  
          ],
  
          { stdio: "inherit" }
  
      );
  
  
  
      //Pass result to a variable
  
      //var duration = stdio;
  
  
  
      //Read the content from the /tmp directory
  
      fs.readdir("/tmp/", function (err, data) {
  
          if (err) throw err;
  
          console.log('Contents of tmp file: ', data);
  
      });
  
  
  
      // Get duration of Flac file
  
      // Windows 10 ffmpeg command is 
  
      // ffprobe in.wav -show_entries stream=duration -select_streams a -of compact=p=0:nk=1 -v 0
  
      spawnSync(
  
          "/opt/bin/ffprobe",
  
          [
  
              `in.wav`,
  
              "-show_entries",
  
              "stream=duration",
  
              "-select_streams",
  
              "a",
  
              "-of",
  
              "compact=p=0:nk=1",
  
              "-v",
  
              "0"
  
          ],
  
          { stdio: "inherit" }
  
  
  
          //Pass result to a variable
  
          //var duration = stdio;
  
      );
  
  
  
  };

  Can anyone who has had success with this ffmpeg Lambda layer help get an output for these commands ?

  Here are some resources regarding the FFmpeg Lambda layer :

  https://serverless.com/blog/publish-aws-lambda-layers-serverless-framework/
  https://github.com/serverlesspub/ffmpeg-aws-lambda-layer
  https://devopstar.com/2019/01/28/serverless-watermark-using-aws-lambda-layers-ffmpeg/

• ffmpeg_filter : initialize sub2video.end_pts together with last_pts

  20 février 2019, par Jan Ekström

  ffmpeg_filter : initialize sub2video.end_pts together with last_pts
  This way re-initializations properly update end_pts, enabling
  
  sub2video_heartbeat to call sub2video_update as expected to re-init
  
  the sub2video AVFrame's contents and to feed a frame into the filter
  
  chain.
  This then fixes memory usage ballooning due to framesync waiting
  
  for secondary input in case of no actual subtitle samples being present
  
  for a while in source after a re-init occurs.
  

  • [DH] fftools/ffmpeg_filter.c