Fix DRM slideshow playback - #51
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DRM DASH streams defaulted to a low-framerate slideshow preview because inputstream.adaptive picked the first adaptation set, which is a trickplay track. Fixed by downloading the manifest, stripping all trickmode adaptation sets, injecting a BaseURL pointing back at the origin, and serving the filtered manifest through a local HTTP proxy (ManifestProxyServer). The proxy re-fetches and re-filters the manifest on every request so segments stay current for long-running 24/7 streams, and ties its lifetime to actual playback stop/end/error instead of a fixed shutdown timer, with a generous idle timeout as a safety net. Background refresh failures are logged quietly instead of surfacing a UI notification.
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The DRM DASH streams default to a low-framerate slideshow preview because inputstream.adaptive selects the first adaptation set, which is a trickplay track. We resolve this by downloading the manifest, removing all trickmode adaptation sets, injecting a BaseURL, and serving the filtered XML via a temporary local HTTP server.