Crop Modes

This page describes the different crop modes available for the training and embeddings-search feature the BirdNET-Analyzer. In general a crop mode selection will be available in cases where audio files longer than 3 seconds are processed. With the the crop mode you can specify how the audio files should be cropped into 3 second snippets.

Center

This crop mode will take the center 3 seconds of the audio file.

First

This crop mode will take the first 3 seconds of the audio file.

Segments

With this crop mode you can also specify an overlap. The crop mode will then split the audio file into 3 second segments with the specified overlap. In the training feature this will result in multiple training examples that are generated from the same audio file. In the search feature the similarity measure will be averaged over all segments of the query example.

Smart

In Smart mode, the system analyzes the audio signal to detect segments with the highest energy or amplitude peaks, the points where relevant events such as bird calls are most likely to occur. From the full recording, the top 5 segments with the strongest peaks are selected; if fewer than five segments are detected, all are returned. This mode is particularly useful for longer audio files (around 15 seconds or more, or whenever overlap produces more than five segments).