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2a8307b98d
Since DASH doesn't have the ability to change keys dynamically per-track (Representation), there's no need for the DASH downloader to decrypt segments as they are downloaded (like HLS). This halves the amount of processes needing to be opened as well as the I/O usage. It may result in noticeably lower CPU usage. Since the IOPS is lowered, you may even see an increase in download speed if downloading to something like a meh HDD. This also fixes decryption in some weird edge-cases where decrypting each segment individually resulted in timestamp anomalies causing shaka to fail.