Creating End Rolls with ffmpeg: Image Overlay, Color Transition

Introduction

End rolls are a common feature in video production, providing a way to display credits, logos, or other information at the end of a video. In this article, we will explore how to create end rolls using ffmpeg, a powerful and popular open-source tool for video and audio processing. Specifically, we will focus on adding an image overlay and performing a color transition on the last frame of the video.

Image Overlay

To add an image overlay to a video, we can use the ffmpeg command with the overlay filter. The basic syntax is as follows:

ffmpeg -i input.mp4 -i image.png -filter_complex "overlay=W-w-10:H-h-10" output.mp4

Here, input.mp4 is the input video file, image.png is the image file to be overlaid, and output.mp4 is the output video file. The overlay filter specifies the position of the image overlay, with W-w-10 and H-h-10 indicating that the image should be positioned 10 pixels from the right and bottom edges of the video frame, respectively.

Color Transition

To perform a color transition on the last frame of the video, we can use the color filter and the overlay filter together. The basic syntax is as follows:

ffmpeg -i input.mp4 -vf "color=c=blue:s=1920x1080:d=0.05,format=rgba,overlay=W-w-10:H-h-10:shortest=1" -y output.mp4

Here, color=c=blue:s=1920x1080:d=0.05 specifies a blue color filter with a duration of 0.05 seconds (5 frames at 30 fps). format=rgba ensures that the output is in RGBA format, which is required for the overlay filter. overlay=W-w-10:H-h-10:shortest=1 overlays the color filter on the last frame of the video, with shortest=1 ensuring that the filter duration matches the video duration.

Putting it Together

To create an end roll with an image overlay and a color transition on the last frame, we can combine the two commands above. The basic syntax is as follows:

ffmpeg -i input.mp4 -i image.png -filter_complex "overlay=W-w-10:H-h-10,color=c=blue:s=1920x1080:d=0.05,format=rgba,overlay=W-w-10:H-h-10:shortest=1" -y output.mp4

Here, the overlay filter is applied first to add the image overlay to the video. Then, the color filter is applied to perform the color transition on the last frame. The shortest=1 option ensures that the color transition matches the duration of the video.

Example

Suppose we have an input video file input.mp4 and an image file image.png that we want to use for the overlay. We can create an end roll with a 5-second fade-out using the following command:

ffmpeg -i input.mp4 -i image.png -filter_complex "overlay=W-w-10:H-h-10,color=c=gray:s=1920x1080:d=5,format=rgba,overlay=W-w-10:H-h-10:shortest=1" -y output.mp4

This command will add the image overlay to the video, then perform a 5-second fade-out using the color filter. The resulting video will have the image overlay on the last frame, with a fade-out effect.

Conclusion

In this article, we have explored how to create end rolls using ffmpeg, with a focus on adding an image overlay and performing a color transition on the last frame. By combining the overlay and color filters, we can create a wide variety of end roll effects to suit our needs.

References

• ffmpeg documentation on the overlay filter
• ffmpeg documentation on the color filter
• Stack Overflow: How to add a fade-out effect to the last frame of a video using ffmpeg?

• ffmpeg documentation on the overlay filter: https://ffmpeg.org/ffmpeg-filters.html#overlay
• ffmpeg documentation on the color filter: https://ffmpeg.org/ffmpeg-filters.html#color
• Stack Overflow: How to add a fade-out effect to the last frame of a video using ffmpeg?: https://stackoverflow.com/questions/55086681/how-to-add-a-fade-out-effect-to-the-last-frame-of-a-video-using-ffmpeg