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Flinch

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One year ago, someone decided to test the image and sound degradation that occurs when you upload a video to YouTube, then download the YouTube result, and upload it again. He did it 1,000 times, with trippy results.

The process is simple, analogous to the effect of photocopying a photocopy again and again.

Every time you upload the resulting video to YouTube, their video servers will re-encode it again. Encoding the video means that it will be compressed, taking details out of the image and audio, and producing artifacts. When you do this once, the details and the artifacts are not noticeable. That's how compression works: A video gets smaller in size—and therefore easier to transmit through the internet—thanks to the brain's ability to ignore the lack of details. The brain—such a wonderful and forgiving machine—fills in the blanks and problems that the compression program thinks you won't notice.

The problem occurs when you go through this process many times. The artifacts and lack of detail get fed again to the compressor, which takes out even more details and introduces new glitches. The second time you do it, you probably won't notice it. But every time this process is repeated, more will go off.

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One year ago, someone decided to test the image and sound degradation that occurs when you upload a video to YouTube, then download the YouTube result, and upload it again. He did it 1,000 times, with trippy results.

The process is simple, analogous to the effect of photocopying a photocopy again and again.

Every time you upload the resulting video to YouTube, their video servers will re-encode it again. Encoding the video means that it will be compressed, taking details out of the image and audio, and producing artifacts. When you do this once, the details and the artifacts are not noticeable. That's how compression works: A video gets smaller in size—and therefore easier to transmit through the internet—thanks to the brain's ability to ignore the lack of details. The brain—such a wonderful and forgiving machine—fills in the blanks and problems that the compression program thinks you won't notice.

The problem occurs when you go through this process many times. The artifacts and lack of detail get fed again to the compressor, which takes out even more details and introduces new glitches. The second time you do it, you probably won't notice it. But every time this process is repeated, more will go off.

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