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When cropping stsc atom, it's assumed that chunk index is never 0. Based on this assumption, start_chunk and end_chunk are calculated by subtracting 1 from it. If chunk index is zero, start_chunk or end_chunk may underflow, which will later trigger "start/end time is out mp4 stco chunks" error. The change adds an explicit check for zero chunk index to avoid underflow and report a proper error. Zero chunk index is explicitly banned in ISO/IEC 14496-12, 8.7.4 Sample To Chunk Box. It's also implicitly banned in QuickTime File Format specification. Description of chunk offset table references "Chunk 1" as the first table element. |
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