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Lossy conversion cannot restore detail missing from the source. Compression presets for lossless formats change file size and processing time, without reducing sound quality.
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AC3 → MP3
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AC3 to MP3 for ordinary playback
MP3 supports at most two audio channels. Surround AC3 is mixed down for MP3, so the original channel separation is lost. The first audio track is encoded at 320 kbit/s. Keep AC3 for surround playback.
Choose a readable original and keep a backup.
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