How to Fix Incorrect Starting Time of Image Sequence in FFMPEG

Learn how to adjust the starting time of image sequences in `FFMPEG` to ensure they begin playing exactly when you want them to.
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This video is based on the question https://stackoverflow.com/q/66937895/ asked by the user 'Digerkam' ( https://stackoverflow.com/u/2007222/ ) and on the answer https://stackoverflow.com/a/66937981/ provided by the user 'Gyan' ( https://stackoverflow.com/u/5726027/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Fixing Image Sequence Timing Issues in FFMPEG

Using FFMPEG for video editing and processing can sometimes lead to unexpected challenges, especially when working with multiple inputs, such as images or video sequences. One common issue that users encounter is the incorrect starting time of an image sequence. In this post, we’ll address this problem head-on and provide a clear guide on how to make it work as intended.

The Problem

Imagine you have three inputs: two static images and a sequence of images stored in a folder. The total length of your image sequence is three seconds, and you want to show this sequence at the 5th second of your output video. However, when you render the video, the image sequence starts playing not at the beginning of the designated time, creating confusion and disrupting the flow.

Example Scenario

Here’s a snippet of your FFMPEG command:

[[See Video to Reveal this Text or Code Snippet]]

In this command:

Two images are displayed initially.

At the 5-second mark of the output video (out.mp4), you expect to see the image sequence.

Instead, the sequence appears prematurely, causing visual confusion.

The Solution

To solve this problem and ensure your image sequence starts exactly at the intended time, you need to adjust the timestamps of the image sequence input. This can be achieved using the -itsoffset option in your FFMPEG command.

Adjusting the Input Timing

The key is to set an offset for the image sequence so that it aligns correctly with the intended start time in the output video. Here’s how to do it:

Add -itsoffset for the Image Sequence Input
By setting the -itsoffset to 5 seconds for your image sequence input, it will start rendering from the 5-second mark.

Here’s the adjusted line of code you will use:

[[See Video to Reveal this Text or Code Snippet]]

Full Revised FFMPEG Command
Incorporate the change into your full command as shown below:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By using the -itsoffset option, you effectively control when your image sequence begins to play in relation to the rest of your video. This allows for a smoother viewer experience and keeps the flow of your video intact.

So next time you face similar timing issues in FFMPEG, remember this simple adjustment! Happy editing!