Split Video Chapters: Renumbering Multiple Episodes
In this article, we will discuss how to split video episodes into chapters and renumber them. This can be particularly useful for long videos, lectures, or presentations. We will focus on a variant of the method presented in this Stack Overflow answer, which splits a video into four-chapter chunks. We will build upon this method to renumber the chapters for multiple episodes.
Prerequisites
To follow along, you will need the following tools:
- FFmpeg: a powerful tool for manipulating multimedia data.
- A text editor or Integrated Development Environment (IDE) to write and edit scripts.
Split Video Chapters
First, let's create a script to split a video into chapters. We will use the FFmpeg tool and a simple bash script. Save the following code as split_video.sh.
#!/bin/bash
VIDEO\_PATH="path/to/video.mp4"
CHAPTER\_DURATION="00:10:00" # 10 minutes per chapter
CHAPTER\_COUNT=$(ffprobe -v error -select\_streams v:0 -show\_entries format=duration -of default=noprint\_wrappers=1:nokey=1 "$VIDEO\_PATH" | awk '{print int($0/'"$CHAPTER\_DURATION"'\)}')
for ((i=1; i<=CHAPTER\_COUNT; i++))
do
START\_TIME=$(ffprobe -v error -select\_streams v:0 -show\_entries format=duration -of default=noprint\_wrappers=1:nokey=1 "$VIDEO\_PATH" | awk -v i="$i" 'BEGIN{FS=":"; OFS=":"}{print int(i-1)""FS""$$1""FS""$$2""FS""$$3}')
END\_TIME=$(ffprobe -v error -select\_streams v:0 -show\_entries format=duration -of default=noprint\_wrappers=1:nokey=1 "$VIDEO\_PATH" | awk -v i="$i" 'BEGIN{FS=":"; OFS=":"}{print int(i)""FS""$$1""FS""$$2""FS""$$3}')
ffmpeg -i "$VIDEO\_PATH" -ss "$START\_TIME" -to "$END\_TIME" -c copy "chapter\_$(printf %02d "$i").mp4"
done
This script calculates the number of chapters based on the video's duration and then splits the video into chapters using the specified chapter duration. To use the script, replace path/to/video.mp4 with the path to your video file and run the script with bash split\_video.sh.
Renumbering Chapters
Now that we have our chapters, let's renumber them. We will create another script, renumber\_chapters.sh, to achieve this.
#!/bin/bash
EPISODE\_COUNT=5 # Number of episodes
CHAPTER\_COUNT=4 # Chapters per episode
for ((i=1; i<=EPISODE\_COUNT; i++))
do
for ((j=1; j<=CHAPTER\_COUNT; j++))
do
mv "chapter\_$(printf %02d "$j").mp4" "episode\_$(printf %02d "$i")\_chapter\_$(printf %02d "$j").mp4"
done
done
Replace the EPISODE\_COUNT and CHAPTER\_COUNT variables with the appropriate values for your videos. Run the script with bash renumber\_chapters.sh.
In this article, we have discussed how to split video episodes into chapters and renumber them using FFmpeg and bash scripts. This can be helpful for creating structured video content with multiple episodes and chapters. The provided scripts can be modified to suit your specific needs.