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Merge Video with FFmpeg ​

What is FFmpeg? ​

FFmpeg is a powerful open-source software suite for handling multimedia data. It can be used to record, convert, and stream audio and video. One of its common uses is merging video and audio files.

The basic command to merge a video file with an audio file is:

bash
ffmpeg -i video.mp4 -i audio.mp4 -c:v copy -c:a aac output.mp4

Installing FFmpeg ​

Windows ​

  1. Visit the official FFmpeg download page: https://ffmpeg.org/download.html
  2. Click on "Windows Builds"
  3. Download the latest release
  4. Extract the zip file
  5. Add FFmpeg to your system PATH:
    • Right-click on "This PC" or "My Computer"
    • Click "Properties"
    • Click "Advanced system settings"
    • Click "Environment Variables"
    • Under "System Variables", find and select "Path"
    • Click "Edit"
    • Click "New"
    • Add the path to the FFmpeg bin folder (e.g., C:\ffmpeg\bin)
    • Click "OK" to save

macOS ​

Using Homebrew:

bash
brew install ffmpeg

Batch Merging Videos ​

Windows Script ​

Create a new file called merge_videos.bat with the following content:

batch
@echo off
setlocal enabledelayedexpansion
mkdir merged 2>nul

for %%f in (*1080p.mp4 *720p.mp4) do (
    set "filename=%%~nf"
    set "quality=!filename:~-5!"
    set "basename=!filename:~0,-5!"
    
    if exist "!basename!.audio.mp4" (
        echo Merging !basename! with !quality! quality...
        ffmpeg -i "%%f" -i "!basename!.audio.mp4" -c:v copy -c:a aac "merged/!basename!.merged.mp4"
    )
)

echo All videos have been merged!
pause

Save this script in the same folder as your videos and run it. It will:

  1. Create a merged directory if it doesn't exist
  2. Find all files ending with 1080p.mp4 or 720p.mp4
  3. Look for corresponding .audio.mp4 files
  4. Merge them and save as .merged.mp4 in the merged directory

macOS Script ​

Create a new file called merge_videos.sh with the following content:

bash
#!/bin/bash

# Create merged directory if it doesn't exist
mkdir -p merged

# Find all video files with quality suffix (1080p.mp4 or 720p.mp4)
for video in *[0-9]p.mp4; do
    if [ -f "$video" ]; then
        # Get base name without quality suffix
        basename="${video%[0-9]p.mp4}"
        
        # Check if corresponding audio file exists
        if [ -f "${basename}.audio.mp4" ]; then
            echo "Merging ${basename}..."
            ffmpeg -i "$video" -i "${basename}.audio.mp4" -c:v copy -c:a aac "merged/${basename}.merged.mp4"
        fi
    fi
done

echo "All videos have been merged!"

To use the macOS script:

  1. Save it as merge_videos.sh
  2. Make it executable:
    bash
    chmod +x merge_videos.sh
  3. Run it:
    bash
    ./merge_videos.sh

The script will perform the same operations as the Windows version, creating a merged directory and combining the video and audio files.

Notes ​

  • Make sure FFmpeg is properly installed and accessible from the command line before running the scripts
  • The scripts will match video files with quality suffixes like 1080p.mp4 or 720p.mp4
  • Each video file should have a corresponding audio file named filename.audio.mp4
  • The merged files will be saved as filename.merged.mp4 in the merged directory
  • The original files will not be modified or deleted