Hey Ed, keepvid.com kind of breaks down how YouTube stores the videos. From my discoveries I've seen that they store the video at the different quality resolutions and they derive an .mp3 from the audio track. One example when I upload a 4K video...... When it first uploads, it's only available as 240p. Then during the next hour, it derives the better quality versions up to the highest quality the original upload was.

See the screenshot. You can see these YouTube video breakdowns at keepvid.com.

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KeepVid.com



Steve

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