Add MP4 metadata (title, artist, cover) support - #13772
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Embed metadata into MP4/M4A outputs: Mp4FromDashWriter now stores title, artist and cover bytes, exposes setMetadata(), and writes udta/meta/ilst atoms (including image type detection). M4aNoDash and Mp4FromDashMuxer pass stream info to setMetadata. Postprocessing gained fetchCoverArt() which downloads the preferred thumbnail via DownloaderImpl (obeys metered-data preference and an 8 MiB size cap) and isMobileDataLimited() to avoid downloads on limited mobile data. Added required imports and safety checks.
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Embed metadata into MP4/M4A outputs: Mp4FromDashWriter now stores title, artist and cover bytes, exposes setMetadata(), and writes udta/meta/ilst atoms (including image type detection). M4aNoDash and Mp4FromDashMuxer pass stream info to setMetadata. Postprocessing gained fetchCoverArt() which downloads the preferred thumbnail via DownloaderImpl (obeys metered-data preference and an 8 MiB size cap) and isMobileDataLimited() to avoid downloads on limited mobile data. Added required imports and safety checks.