to pull the raw audio tracks from a Blu-ray or DVD without re-encoding. Transcoding (Optional)
: 256 kbps (this is the standard for Apple Music and iTunes purchases).
Most 640 kbps repacks aren't just stereo; they are often 5.1 surround sound rips from concert Blu-rays or music videos. To maintain high fidelity across six channels, a higher bitrate is required.
is archival. If you are converting a vinyl rip to Opus, 512kbps or 640kbps Opus serves as a "transparent" backup that saves space compared to FLAC.
At 640 kbps, a 4-minute song = 640 × 240 seconds / 8 = (similar to a moderate FLAC level 8).
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