Answer by Untherow

Maybe this is not relevant anymore since Unity can compress WAV files directly to very compact seamlessly looping OGG files and can't see any benefit using MP3s nowadays, but I actually were able to loop MP3 files surprisingly well with a script I wrote. :) ///

/// Trims silence from both ends in an AudioClip. /// Makes mp3 files seamlessly loopable. ///

/// /// /// AudioClip trimSilence(AudioClip inputAudio, float threshold = 0.05f) { // Copy samples from input audio to an array. AudioClip uses interleaved format so the length in samples is multiplied by channel count float[] samplesOriginal = new float[inputAudio.samples * inputAudio.channels]; inputAudio.GetData(samplesOriginal, 0); // Find first and last sample (from any channel) that exceed the threshold int audioStart = Array.FindIndex(samplesOriginal, sample => sample > threshold), audioEnd = Array.FindLastIndex(samplesOriginal, sample => sample > threshold); // Copy trimmed audio data into another array float[] samplesTrimmed = new float[audioEnd - audioStart]; Array.Copy(samplesOriginal, audioStart, samplesTrimmed, 0, samplesTrimmed.Length); // Create new AudioClip for trimmed audio data AudioClip trimmedAudio = AudioClip.Create(inputAudio.name, samplesTrimmed.Length / inputAudio.channels, inputAudio.channels, inputAudio.frequency, false); trimmedAudio.SetData(samplesTrimmed, 0); return trimmedAudio; }