Problem
Chinese subtitle characters are replaced because the selected export font lacks required glyphs.
Solution
Root Cause / Diagnostic:
Export configurations utilizing standard system sans-serif fonts often lack full CJK ideograph coverage across GB2312, Big5, or GB18030 character sets. When the font rasterizer encounters an unmapped Chinese character, it renders a fallback placeholder glyph (tofu) or substitutes an incongruent system typeface.
Actionable Fix:
1. Assign a universal CJK OpenType font family with comprehensive glyph coverage (such as Noto Sans SC/TC or Source Han Sans) directly to the subtitle track style.
2. Avoid rasterized burn-in exports using generic system fonts; embed standard UTF-8 text streams or burn in using verified TTF/OTF typography.
3. Perform an end-to-end visual review of specialized technical terminology and rare Hanzi characters across the rendered video master.
Pro Tip:
Always distinguish between Simplified Chinese (zh-Hans, targeted for Mainland China/Singapore) and Traditional Chinese (zh-Hant, targeted for Taiwan/Hong Kong) typography to prevent regional glyph variant mismatches.
Export configurations utilizing standard system sans-serif fonts often lack full CJK ideograph coverage across GB2312, Big5, or GB18030 character sets. When the font rasterizer encounters an unmapped Chinese character, it renders a fallback placeholder glyph (tofu) or substitutes an incongruent system typeface.
Actionable Fix:
1. Assign a universal CJK OpenType font family with comprehensive glyph coverage (such as Noto Sans SC/TC or Source Han Sans) directly to the subtitle track style.
2. Avoid rasterized burn-in exports using generic system fonts; embed standard UTF-8 text streams or burn in using verified TTF/OTF typography.
3. Perform an end-to-end visual review of specialized technical terminology and rare Hanzi characters across the rendered video master.
Pro Tip:
Always distinguish between Simplified Chinese (zh-Hans, targeted for Mainland China/Singapore) and Traditional Chinese (zh-Hant, targeted for Taiwan/Hong Kong) typography to prevent regional glyph variant mismatches.