OGG: Unexpectedly found nil while implicitly unwrapping an Optional value

[yspreen]

// initialize opus encoder
encoder = opus_encoder_create(opusRate, pcmChannels, application.rawValue, &status)

happening when I encode an m4a file. the exception is thrown in OGGEncoder.swift

[yspreen]

this is a bit bizarre:

[yspreen]

My sample rate was too high. Recording files at 16000 fixed the issue.

[agrathwohl]

My sample rate was too high. Recording files at 16000 fixed the issue.

I am not sure it was an issue of the sampling rate being too high, but rather the value you gave it initially, 44100, is not supported by Opus.

See the following opus FAQ article: Opus does not directly support a 44.1kHz sampling rate.