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Okay that is a Qt QWebEngine/Chromium bug that impacts only audio and video that uses proprietary codecs and a custom scheme handler.
I have added a workaround our URLSchemeHandler to redirect them as file: scheme urls to prevent the partial byte range requests as there appears no way to handle them inside QtWebengine.
This has been pushed to master so mp4 videos now work again in Sigil's Preview in the next release. WebM videos should work already.
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