Why a single MP4 export is not enough for transparent video workflows

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Exporting a background-removed video as a single MP4 file does not guarantee preserved transparency, as different downstream tasks require different output formats. WebM with alpha suits web display, ProRes 4444 MOV is preferred for compositing in video editors, while a two-file H.264 workflow separates color and grayscale matte data. A key technical distinction is whether color data is straight or premultiplied alpha, since confusing the two can produce dark fringing around silhouettes. Developers at unbg.video shared an FFmpeg-based smoke test using synthetic red video and a grayscale ramp to verify that alpha data is correctly stored and extractable in ProRes 4444. The article emphasizes that file extensions alone do not define the full export contract, and choosing the right format depends on the intended next step in the production pipeline.

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