Video Compress for Zalo

😫 The Pain Point

Zalo limits video attachments to 25MB. Your phone recorded a 100MB video. You need to compress it without making it unwatchable.

🚀 Agentic Solution

A Smart Video Compressor that targets a specific file size.

Key Features:

• Target Size: Specify “under 25MB” and the script calculates optimal bitrate.
• Quality Presets: Fast, Balanced, High Quality.
• Batch Mode: Compress multiple videos at once.

⚔️ Phase 1: Commander (Quick Fix)

For quick compression.

Prompt:

“I have a video party.mp4 (100MB). Write a Python script using FFmpeg to:

1. Target Size: Compress to under 25MB.
2. Calculate Bitrate: Based on duration and target size.
3. Maintain Audio: Keep audio at 128kbps.
4. Output: Save as party_compressed.mp4.

Print progress. Handle FFmpeg errors gracefully.”

Result: Shareable video that fits Zalo’s limit.

🏗️ Phase 2: Architect (Permanent Tool)

For Social Media Marketers.

Engineering Prompt:

**Role:** Python GUI Developer (PyQt6 Specialist)
**Task:** Create "Social Video Compressor" Desktop App

**Objective:** A batch video compression tool tailored for platform limits (Zalo 25MB, Discord 8MB).

**Tech Stack:**
* Language: Python 3.10+
* GUI Library: PyQt6 (Cross-platform)
* Media Engine: FFmpeg
* Packaging: PyInstaller

**Functional Requirements:**
1.  **UI Layout (PyQt6):**
    *   **Drag Drop:** Area for video files.
    *   **Presets:** Buttons for "Zalo (25MB)", "Discord (8MB)", "Email (25MB)".
    *   **Custom:** Manual Target Size Input (MB).
    *   **Priority:** Radio for "Prioritize Quality" (slower) vs "Prioritize Speed".

2.  **Core Logic:**
    *   Calculate Target Bitrate = (Target Size / Duration).
    *   Pass 1/Pass 2 FFmpeg encoding for strict size adherence.
    *   **Threading:** Run encoding process in background thread.

3.  **Deliverables:**
    *   `main.py`: Complete source code.
    *   `requirements.txt`: Dependencies.
    *   **Build Instructions:**
        *   Windows: `pyinstaller --onefile --noconsole main.py`
        *   macOS: `pyinstaller --windowed --noconsole main.py`

🧠 Prompt Decoding

• Two-pass encoding: First pass analyzes the video, second pass optimizes compression. Better quality at same file size.

🛠️ Instructions

1. Install FFmpeg.
2. Copy Prompt → Run.