mirror of
https://github.com/nginx/nginx.git
synced 2025-02-25 18:55:26 -06:00
6e8ccee062
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.
Documentation is available at http://nginx.org