Concatenate FFmpeg Recording Segments without Resetting Timestamps: A Guide

Title: Resetting Timestamps to Join Segmented Videos Correctly

Introduction

This article aims to guide users on how to reset the timestamps of segmented video files to join them correctly. We'll cover key concepts, provide detailed context, and offer code examples where necessary.

Prerequisites

• Basic understanding of video file formats and containers
• Familiarity with command-line tools like FFmpeg

Segmented Video Files and Incorrect Timecode Data

Segmented video files are often used for live streaming, where a single video is divided into smaller chunks or segments. However, these segments may contain incorrect timecode data, causing issues when trying to join them back together.

Resetting Timestamps with FFmpeg

FFmpeg is a powerful, open-source tool that can handle a wide range of multimedia tasks, including resetting timestamps on segmented video files.

Step 1: Install FFmpeg

If you haven't already, install FFmpeg on your system. Detailed installation instructions can be found here.

Step 2: Reset Timestamps

Use the following command to reset the timestamps of your segmented video files:

ffmpeg -i input_%04d.mp4 -c copy -map 0 -strict -2 output.mp4

Replace input_%04d.mp4 with the pattern of your segmented video files, and output.mp4 with the desired output file name.

Step 3: Join Segments

After resetting the timestamps, you can join the segments back together using the concat demuxer:

ffmpeg -f concat -i <(echo -e "file 'input_0001.mp4'
file 'input_0002.mp4'
file 'input_0003.mp4'") -c copy output.mp4

Replace the file names in the echo command with the names of your segmented video files.

Code Example

Here's a code example demonstrating how to reset timestamps and join segments using Python and the ffmpeg-python library:

from ffmpeg import ffmpeg

# Reset timestamps
ffmpeg -i input_%04d.mp4 -c copy -map 0 -strict -2 output.mp4

# Join segments
files = ["input_0001.mp4", "input_0002.mp4", "input_0003.mp4"]
cmd = ffmpeg(*files).concat().output("output.mp4", format="mp4")
cmd.run()

References

• FFmpeg Documentation
• FFmpeg Wiki: Segmented Media
• FFmpeg Python Library

Summary

In this article, we've discussed how to reset the timestamps of segmented video files to join them correctly using FFmpeg. We've provided code examples using both the command-line tool and the ffmpeg-python library. By following the steps outlined in this guide, you should be able to successfully join your segmented video files.

Further Reading

• Segmented Media - FFmpeg Wiki
• FFmpeg: Joining Segmented Media Files - Super User
• Joining MP4 Segments with FFmpeg - Stack Overflow