There are two options: run using Docker and run from source.

Replace with directory with Lottie animations / Telegram stickers and run:

• Convert to GIF:

  docker run --rm -v <path to directory>:/source edasriyan/lottie-to-gif

• Convert to PNG:

  docker run --rm -v <path to directory>:/source edasriyan/lottie-to-png

• Convert to APNG:

  docker run --rm -v <path to directory>:/source edasriyan/lottie-to-apng

• Convert to WEBP:

  docker run --rm -v <path to directory>:/source edasriyan/lottie-to-webp

You can provide parameters via env variables:

• HEIGHT: Output image height. Default: 512
• WIDTH: Output image width. Default: 512
• FPS: Output frame rate. Default: apng,png,webp - 60; gif - 50
• QUALITY: Output quality. Default: 90
• THREADS: Number of threads to use. Default: number of CPUs

Example:

docker run --rm -e HEIGHT=256 -e WIDTH=256 -e FPS=30 -v /home/ed/Downloads/lottie-animations:/source edasriyan/lottie-to-apng

Results will be saved next to each source file in the same directory.

1. Install dependencies

   1. Make sure you have C++17 compiler, make, cmake and conan tools installed; otherwise install them
   2. Make sure you have the tools installed:
      • gifski if you want to convert to GIF
      • ffmpeg if you want to convert to APNG
      • img2webp if you want to convert to WEBP
   3. Install conan dependencies
      • If you run on AMD:

        conan install .
        

      • If you run on ARM:

        conan install --build=libpng --build=zlib .
        

2. Build

   cmake CMakeLists.txt && make
   

   CMake options

   LOTTIE_TO_PNG_STATIC_LINKING: enable static linking. Default value: OFF if OS is darwin; otherwise ON

   cmake -DLOTTIE_TO_PNG_STATIC_LINKING=ON CMakeLists.txt && make
   
   cmake -DLOTTIE_TO_PNG_STATIC_LINKING=OFF CMakeLists.txt && make
   

   M1 troubleshooting

   Run the following command and try again:

   echo '#if defined(__ARM_NEON__)
   
   #include "vdrawhelper.h"
   
   void memfill32(uint32_t *dest, uint32_t value, int length)
   {
       memset(dest, value, length);
   }
   
   static void color_SourceOver(uint32_t *dest, int length, uint32_t color, uint32_t alpha)
   {
       int ialpha, i;
   
       if (alpha != 255) color = BYTE_MUL(color, alpha);
       ialpha = 255 - vAlpha(color);
       for (i = 0; i < length; ++i) dest[i] = color + BYTE_MUL(dest[i], ialpha);
   }
   
   void RenderFuncTable::neon()
   {
       updateColor(BlendMode::Src , color_SourceOver);
   }
   #endif
   ' > lib/src/rlottie/src/vector/vdrawhelper_neon.cpp
   

3. Convert!

   • To convert to GIF:

     ./bin/lottie_to_gif.sh /home/ed/Downloads/animation.json
     

   • To convert to PNG:

     ./bin/lottie_to_png.sh /home/ed/Downloads/animation.json
     

   • To convert to APNG:

     ./bin/lottie_to_apng.sh /home/ed/Downloads/animation.json
     

   • To convert to WEBP:

     ./bin/lottie_to_webp.sh /home/ed/Downloads/animation.json
     

   Results will be saved next to each source file in the same directory.

$ ./bin/lottie_to_gif.sh --help 
usage: ./bin/lottie_to_gif.sh [--help] [--output OUTPUT] [--height HEIGHT] [--width WIDTH] [--threads THREADS] [--fps FPS] [--quality QUALITY] path

Lottie animations (.json) and Telegram stickers for Telegram (*.tgs) to animated .gif converter

Positional arguments:
 path              Path to .json or .tgs file to convert

Optional arguments:
 -h, --help        show this help message and exit
 --output OUTPUT   Output file path
 --height HEIGHT   Output image height. Default: 512
 --width WIDTH     Output image width. Default: 512
 --fps FPS         Output frame rate. Default: 50
 --threads THREADS Number of threads to use. Default: number of CPUs
 --quality QUALITY Output quality. Default: 90

• What is lottie? - https://airbnb.design/lottie/
• You can download Telegram sticker files (.tgs) using @Stickerdownloadbot.

Project is made with Jetbrains support ❤️