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If your goal is to turn the audio content into text (transcription), several AI-powered tools can handle both direct YouTube links and uploaded FLAC files: Transcriptly: Free Audio and Video to Text Converter
Converting a lossy source (like a YouTube stream) to a lossless format (FLAC) is like taking a low-resolution photo and saving it as a massive 4K file—the file size increases, but the detail doesn't "reappear". Why use FLAC then? Audiophiles choose FLAC to prevent generational loss
