Version 1

README.md

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+# GIF to WebM Converter
+
+This script converts an animated GIF into a WebM format that's fully compatable with telegram animated stickers with options to adjust the playback speed (max allowed telegram animated sticker lenght is 3s). 
+
+## Features
+
+- Converts GIF files into transparent WebM animations.
+- Adjustable speed for the output animation.
+
+## Prerequisites
+
+- **ffmpeg**
+
+## Usage
+
+Don't forget to `chmod +x` it
+
+### Command Syntax
+
+```sh
+./gif2webm.sh input.gif [speedup_factor]
+```
+
+#### Parameters
+
+- `input.gif`: The path to the input GIF file you want to convert.
+- `[speedup_factor]`: (Optional) A factor to speed up the animation. Default is `1` (no speedup).
+
+### Help
+
+To display help information, run:
+
+```sh
+./gif2webm.sh --h
+```
+
+### Examples
+
+1. **Convert a GIF without speedup**:
+
+   ```sh
+   ./gif2webm.sh input.gif
+   ```
+
+2. **Convert with a specified speedup factor**:
+
+   ```sh
+   ./gif2webm.sh input.gif 0.5
+   ```
+
+3. **Display usage information**:
+
+   ```sh
+   ./gif2webm.sh --h
+   ```

gif2webm.sh

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+#!/bin/bash
+
+# Display usage information when requested or when no arguments are provided
+usage() {
+    echo "Usage: $0 input.gif [speedup_factor]"
+    echo "  speedup_factor: Factor by which to speed up the animation (default is 1)."
+    echo "  -h or --h: Display this help message."
+    exit 1
+}
+
+# Check if help is requested
+if [[ $1 == "-h" || $1 == "--h" ]]; then
+    usage
+fi
+
+# Validate parameters
+if [[ $# -lt 1 ]]; then
+    usage
+fi
+
+input_file="$1"
+speedup="${2:-1}"  # Default to 1 if not provided
+output_file="${input_file%.gif}.webm"
+
+# Run ffmpeg command with the specified parameters
+ffmpeg -i "$input_file" -vf "scale=512:512:force_original_aspect_ratio=decrease,fps=30,setpts=${speedup}*PTS" -pix_fmt yuva420p -b:v 512k "$output_file"
+
+echo "Converted $input_file to $output_file with a speedup factor of $speedup."