Upgraded FFmpeg 7: Drawtext Error - Solution with libfreetype and libharfbuzz

Upgraded FFmpeg 7: Drawtext Error and Solution with libfreetype and libharfbuzz

If you've upgraded to FFmpeg 7 and encountered the error "Drawtext not found," you're not alone. This article will provide a detailed explanation of the issue and offer a solution that involves enabling both libfreetype and libharfbuzz.

Background

FFmpeg is a powerful, open-source multimedia framework that allows users to manipulate audio and video files. One popular feature of FFmpeg is the ability to add subtitles to videos using the drawtext filter. However, in FFmpeg 7, the drawtext filter no longer works out of the box, and users are required to enable additional libraries to use this feature.

The Problem

The error message "Drawtext not found" occurs because the drawtext filter is no longer included in the default build of FFmpeg 7. This change was made to reduce the size of the FFmpeg binary and to encourage users to build FFmpeg with the features they need.

The Solution

To solve this problem, you need to enable the libfreetype and libharfbuzz libraries when building FFmpeg. These libraries provide the necessary functionality for the drawtext filter to work correctly.

Enabling libfreetype

To enable libfreetype, you need to add the following flag to your FFmpeg build configuration:

--enable-libfreetype

Enabling libharfbuzz

To enable libharfbuzz, you need to add the following flag to your FFmpeg build configuration:

--enable-libharfbuzz

Example Build Configuration

Here is an example build configuration that enables both libfreetype and libharfbuzz:

./configure --enable-gpl --enable-libx264 --enable-libx265 --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libtheora --enable-libspeex --enable-libass --enable-libfreetype --enable-libharfbuzz --enable-nonfree

Key Concepts

Here are some key concepts to keep in mind when working with subtitles in FFmpeg:

• ffmpeg command: The command used to apply filters to a video file. For example, ffmpeg -i input.mp4 -vf "drawtext=text='Hello World':x=10:y=10" output.mp4.
• drawtext filter: The filter used to add subtitles to a video file. This filter allows you to specify the text, position, font, and other properties of the subtitles.
• libfreetype: A library used to provide support for TrueType and OpenType fonts in FFmpeg.
• libharfbuzz: A library used to provide advanced text shaping and layout functionality in FFmpeg.

In summary, the solution to the "Drawtext not found" error in FFmpeg 7 is to enable both libfreetype and libharfbuzz when building FFmpeg. These libraries provide the necessary functionality for the drawtext filter to work correctly. By understanding the key concepts outlined in this article, you can effectively use FFmpeg to add subtitles to your video files.

References

• FFmpeg Documentation
• FreeType Project
• HarfBuzz Project