multimedia.md

Multimedia is content that uses a combination of different content forms such as text, audio, images, animations, video and interactive content. Multimedia contrasts with media that use only rudimentary computer displays such as text-only or traditional forms of printed or hand-produced material.

Image

• Caire is a content aware image resize library based on Seam Carving for Content-Aware Image Resizing paper.
• libvips A fast image processing library with low memory needs. https://libvips.github.io/libvips/
• Is WebP really better than JPEG?

ImageMagick

• ImageMagick：批量处理图像的超级利器

• 使用ImageMagick在命令行下处理图片

• Linux命令 ImageMagick

• 常用 IM 命令

  • convert image.png image.jpg
  • convert -resize 2732x2048! image.jpg new_image.jpg
  • convert image.png -background white -alpha off out.png 关闭 alpha 通道 设置背景色
  • 批量转换当前目录所有 png 至 jpg: mogrify -format jpg *.png
  • 批量拉伸(强制拉伸)当前目录下所有 jpg 至指定大小: mogrify -resize 2732x2048! *.jpg
  • 批量关闭 alpha 通道，设置背景色 mogrify -background white -alpha off *.png
  • 裁剪 convert xxx.png -crop 229X81+0+82 +repage xxx-1.png
  • 生成 android icon 集合

    #!/bin/sh
    if [ "$1" == "" ]; then
        echo "must have name of png"
        exit 1
    fi
    dir=$1-res
    pic=$1.png
    mkdir ./$dir
    convert -resize 180x180! $pic ./$dir/shareicon.png
    mkdir -p ./$dir/drawable
    convert -resize 180x180! $pic ./$dir/drawable/$pic
    mkdir -p ./$dir/drawable-hdpi
    convert -resize 72x72!   $pic ./$dir/drawable-hdpi/$pic
    mkdir -p ./$dir/drawable-ldpi
    convert -resize 36x36!   $pic ./$dir/drawable-ldpi/$pic
    mkdir -p ./$dir/drawable-mdpi
    convert -resize 48x48!   $pic ./$dir/drawable-mdpi/$pic
    mkdir -p ./$dir/drawable-xhdpi
    convert -resize 96x96!   $pic ./$dir/drawable-xhdpi/$pic
    mkdir -p ./$dir/drawable-xxhdpi
    convert -resize 144x144! $pic ./$dir/drawable-xxhdpi/$pic
    mkdir -p ./$dir/drawable-xxxhdpi
    convert -resize 192x192! $pic ./$dir/drawable-xxxhdpi/$pic

optimization

• Essential Image Optimization - an eBook https://images.guide
  • 自动优化图像
• Leanify lightweight lossless file minifier/optimizer
• imagemin Minify images seamlessly
• imgmin Lossy image optimization
• image-optimizer Easily optimize images using PHP https://murze.be/2017/07/easily-optimize-images-using-php-binaries/
• imgo Image optimization tool http://imgo.github.com/imgo
  • https://www.jonof.id.au/kenutils.html macOS Homebrew users may install PNGOUT with: brew install jonof/kenutils/pngout
  • 🚫对比 ppduck 速度太慢了，不推荐

jpg/jpeg

• jpeg-archive Utilities for archiving JPEGs for long term storage.

png

• Crunch Insane(ly slow but wicked good) PNG image optimization
• ⭐pngquant
  • GUI https://imageoptim.com/
  • recursively-batch-process-files-with-pngquant
    • find . -name '*.png' -exec pngquant --ext .png --force 256 {} \;
    • find . -name '*.png' -print0 | xargs -0 -P2 -L1 pngquant --ext .png --force 256 多核处理(-P2)
• http://nullice.com/limitPNG , http://nullice.com/gluttonyPNG 已无人维护，bug多，不推荐

paid

• tinypng Smart PNG and JPEG compression
  • Free: Up to 20 images, max 5 MB each
• ⭐ppduck PP鸭整合了业内最优秀的数种开源的图片压缩算法，会自动根据图片特征自动选择压缩参数。只需要将图片拖入PP鸭，就能自动批量压缩，省时省心。

Audio

• lame --mp3input --abr 32 ${infile} ${outfile}.mp3
• ffmpeg -i "${filename}.wav" -f mp3 "${filename}.mp3"
• 使用 audacity/lame/ffmpeg 进行 mp3 文件瘦身

libraries

• libsoundio C library providing cross-platform audio input and output. The API is suitable for real-time software such as digital audio workstations as well as consumer software such as music players.
• aubio a library for audio and music analysis https://aubio.org
• FastNoise is an open source noise generation library with a large collection of different noise algorithms. This library has been designed for realtime usage from the ground up, so has been optimised for speed without sacrificing noise quality.
• RtAudio A set of C++ classes that provide a common API for realtime audio input/output across Linux (native ALSA, JACK, PulseAudio and OSS), Macintosh OS X (CoreAudio and JACK), and Windows (DirectSound, ASIO and WASAPI) operating systems.
• ofxPDSP is an openFrameworks addon for audio synthesis and generative music.

resources

• awesome-audio-visualization: A curated list about Audio Visualization.

Video

• VLC is a free and open source cross-platform multimedia player and framework that plays most multimedia files as well as DVDs, Audio CDs, VCDs, and various streaming protocols.
• mpv is a free (as in freedom) media player for the command line. It supports a wide variety of media file formats, audio and video codecs, and subtitle types.
• ijkplayer Android/iOS video player based on FFmpeg n3.4, with MediaCodec, VideoToolbox support.

recorder

• LICEcap simple animated screen capture tool for Windows and OS X
• OBS Studio, Free and open source software for live streaming and screen recording

editor

• shotcut cross-platform (Qt), open-source (GPLv3) video editor https://www.shotcut.org

transcoder

• HandBrake is an open-source video transcoder available for Linux, Mac, and Windows

libraries

• Bento4 Full-featured MP4 format and MPEG DASH library and tools

Projects

• NodeTube is an open-source YouTube alt that offers video, audio and image uploads, livestreaming and built-in monetization