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In page QuickTime:
"QuickTime 7 lacks support for H.264 Sample Aspect Ratio.[16] QuickTime X does not have this limitation,[citation needed] but many Apple products (such as Apple TV) still use the older QuickTime 7 engine. iTunes previously utilized QuickTime 7, but as of October 2019, iTunes no longer utilizes the older QuickTime 7 engine.[17]
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