EffectsPlayerLengthCheck.swift

            let fileURL = URL(fileURLWithPath: strongSelf.episodePath!)
            do {
                strongSelf.audioFile = try AVAudioFile(forReading: fileURL, commonFormat: AVAudioCommonFormat.pcmFormatFloat32, interleaved: false)

                // AVAudioFile.length is an expensive operation (often in the seconds) so here we attempt to load a cached value instead
                strongSelf.cachedFrameCount = DataManager.sharedManager.findFrameCount(episode: episode)
                if strongSelf.cachedFrameCount == 0 {
                    // we haven't cached a frame count for this episode, do that now
                    strongSelf.cachedFrameCount = strongSelf.audioFile!.length
                    DataManager.sharedManager.saveFrameCount(episode: episode, frameCount: strongSelf.cachedFrameCount)

                    // If the audio file length is still 0 then way may not be able to read the file correctly
                    if strongSelf.cachedFrameCount == 0 {
                        throw PlaybackError.unableToOpenFile
                    }
                }
            } catch {
                objc_sync_exit(strongSelf.playerLock)
                PlaybackManager.shared.playbackDidFail(logMessage: error.localizedDescription, userMessage: nil)
                return
            }