Replaces external ffmpegthumbnailer dependency with native ffmpeg thumbnail generation, improving cross-platform compatibility (particularly Windows) and reducing dependencies.

Implementation

Adapted thumbnail generator from anacrolix/webtorrent-public (poster.go):

• dlna/dms/thumbnail.go: New ffmpeg-based thumbnail generator

  • Uses ffprobe to determine video duration
  • Seeks to 1/4 duration for representative frame extraction
  • Generates PNG via ffmpeg's thumbnail filter with 30s timeout

• dlna/dms/dms.go: Simplified serveIcon()

  • Removed ffmpegthumbnailer-specific arguments (-s, -q, -t, -c)
  • Added context-based timeout handling
  • Maintains fallback to default icon on failure

Changes

// Before: External tool with custom args
cmd := exec.Command("ffmpegthumbnailer", "-i", filePath, "-o", "/dev/stdout", "-c"+c)

// After: Native ffmpeg with smart seeking
generateThumbnailFFmpeg(ctx, filePath)

Updated:

• README.rst: Removed ffmpegthumbnailer references
• Dockerfile: Removed ffmpegthumbnailer package
• TODO: Removed "Work around lack of ffmpegthumbnailer on Windows"

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