FLAC is a audio format: it applies lossless compression to PCM audio, preserving the original waveform exactly while reducing file size by 40-60% versus WAV. MTS is a video format that stores data in the MTS format. This wraps the audio track in a video container, which some platforms require for upload. Metadata such as creation date and embedded colour profiles is preserved where the target format supports it. Converting between these two formats is common when the source application does not support MTS natively or when the target platform only accepts MTS. 1converter processes this conversion server-side using open-source tools. Files are transferred over HTTPS, converted on secure cloud servers, and automatically deleted after 24 hours.