From 2f054189c03dd7cabf4254b4095a15cf63fa73e2 Mon Sep 17 00:00:00 2001
From: medusa <newton214@gmail.com>
Date: Sat, 9 Mar 2024 11:54:29 +0000
Subject: [PATCH] Add docs/tech_docs/linux/ffmpeg_guide.md

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+Creating a basic guide to `ffmpeg` involves covering some of the most common and useful tasks you can perform with this versatile tool. `ffmpeg` is a powerful command-line tool that allows for video, audio, and other multimedia file processing. Here's a beginner-friendly guide to get you started:
+
+### Introduction to FFmpeg
+
+`ffmpeg` is a comprehensive multimedia processing tool that supports a wide range of formats and tasks, including video and audio conversion, processing, streaming, and more. It's used by professionals and hobbyists alike for its flexibility and powerful capabilities.
+
+### Installing FFmpeg
+
+Before diving into `ffmpeg` commands, ensure you have `ffmpeg` installed on your system.
+
+- **On Ubuntu/Debian:**
+    ```bash
+    sudo apt update
+    sudo apt install ffmpeg
+    ```
+- **On Fedora:**
+    ```bash
+    sudo dnf install ffmpeg
+    ```
+- **On macOS (using Homebrew):**
+    ```bash
+    brew install ffmpeg
+    ```
+
+### Basic FFmpeg Commands
+
+#### 1. Converting Video Formats
+
+One of the most common tasks is converting videos from one format to another. To convert a video file, use the following command structure:
+
+```bash
+ffmpeg -i input.mp4 output.avi
+```
+Replace `input.mp4` with your source file and `output.avi` with the desired output filename and format.
+
+#### 2. Extracting Audio from Video
+
+You can extract audio tracks from a video file into a separate audio file using:
+
+```bash
+ffmpeg -i input.mp4 -vn output.mp3
+```
+This command takes the audio from `input.mp4` and outputs it to `output.mp3`, without the video part (`-vn` stands for "video no").
+
+#### 3. Trimming Video Files
+
+To trim a video file without re-encoding, specify the start time (`-ss`) and the duration (`-t`) of the clip you want to extract:
+
+```bash
+ffmpeg -ss 00:00:10 -t 00:00:30 -i input.mp4 -c copy output.mp4
+```
+This command extracts a 30-second clip starting at the 10-second mark from `input.mp4` to `output.mp4`, copying the streams directly without re-encoding.
+
+#### 4. Combining Video and Audio
+
+To combine a video file with an audio track, use:
+
+```bash
+ffmpeg -i video.mp4 -i audio.mp3 -c:v copy -c:a aac output.mp4
+```
+This merges `video.mp4` and `audio.mp3` into `output.mp4`, copying the video codec and transcoding the audio to AAC.
+
+#### 5. Reducing Video File Size
+
+To reduce the size of a video file, you can change the bitrate or use a different codec:
+
+```bash
+ffmpeg -i input.mp4 -b:v 1000k -c:a copy output.mp4
+```
+This command re-encodes the video to have a lower bitrate (`1000k` bits per second), potentially reducing the file size.
+
+### Tips for Learning FFmpeg
+
+- **Explore the Help Option**: `ffmpeg` comes with extensive documentation. Run `ffmpeg -h` to see an overview or `ffmpeg -h full` for detailed options.
+- **Experiment with Different Options**: `ffmpeg` has numerous options and filters that allow for complex processing. Experimenting is a great way to learn.
+- **Consult the FFmpeg Documentation**: The [FFmpeg Documentation](https://ffmpeg.org/documentation.html) is a comprehensive resource for understanding all of its capabilities.
+
+### Conclusion
+
+This guide provides a starting point for using `ffmpeg`, covering some basic tasks. `ffmpeg` is incredibly powerful, and mastering it can take time. Start with these fundamental tasks, and gradually explore more complex commands and options as you become more comfortable with the tool.
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