A.h.-start Fansub- Kuroinu Kedakaki Seijo — Wa Hakudaku Ni Somaru 01.mp4 ((link))

| Tool | Quick command (Windows) | |------|--------------------------| | (mux only) | 1. Install from https://mkvtoolnix.download 2. Open mkvmerge GUI 3. Drag the .mp4 and the subtitle file into the window. 4. Click Start multiplexing → you get an .mkv with both video and subtitle streams. | | HandBrake (re‑encode with burnt‑in subtitles) | 1. Install from https://handbrake.fr 2. Source → your .mp4 3. In Subtitles tab, click Add Track , choose your .srt , and tick Burn In . 4. Choose a preset (e.g., Fast 1080p30 ) and click Start Encode . |

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A.H.-START Fansub