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Isaac Connor 0183e7e05e fix: HEVC video playback in event view and file downloads

Fix two issues preventing HEVC video playback in the web interface:

1. output_file() Content-Range header missing dash separator between
   byte range start and end values. The 206 Partial Content response
   sent "bytes 04382586/4382587" instead of "bytes 0-4382586/4382587",
   which browsers cannot parse, breaking all video streaming via the
   files view.

2. Event HLS playback fails for HEVC because video.js VHS detects the
   codec as "hvc1" from the fMP4 segment but cannot construct the full
   codec string (e.g. "hvc1.1.6.L153.B0") required by
   MediaSource.addSourceBuffer(). VHS only knows how to parse avcC
   boxes (H.264), not hvcC boxes (HEVC). Use hls.js (already shipped
   for live stream views) for HLS event playback instead - it properly
   parses HEVC codec info from init segments. Non-HLS events continue
   using video.js natively.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-04-05 13:42:59 -04:00