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Element::factory() rejects any element whose declared size runs past the bound it is given, and read() passes the Fast scan limit as that bound. A Segment spans practically the whole file, so under ReadStyle::Fast every Matroska over 512 KiB is rejected and no tags are read: EBML: datasize too great: 1003369 > (524288 - 52) Failed to find Matroska segment The limit is readLimited()'s, which already applies it to skip Cues and to bound the walk over a segment with no usable SeekHead. The lookup only needs the file length. Correctly handle offsets and scan limits: - maxOffset: Maximum offset from the beginning of the file; the end of the element must be before this offset. - scanLimit: Offset from the current file position until which scanning for elements is allowed. Normally, elements are scanned up to the end of the enclosing master element or the end of the file, but in Fast reading mode, it is limited to FAST_SCAN_LIMIT, which is 512 kB. - maxScanOffset: scanLimit from the current file position --------- Co-authored-by: Claude Opus 5 <[email protected]> Co-authored-by: Urs Fleisch <[email protected]>