| Problem | Likely Cause | Fix | |---------|--------------|-----| | | Wrong filename or unsupported format. | Ensure .srt /. ass name matches video exactly. Try a different player. | | Subtitle is out of sync (drifts) | Variable‑frame‑rate video or bad subtitle timing. | Download a newer subtitle version; or re‑time with Subtitle Edit . | | Subtitles display garbled characters | File encoded in non‑UTF‑8 (e.g., Windows‑1252). | Open the .srt in a text editor (Notepad++, VS Code) → Save As → UTF‑8 . | | Video won’t play on my device | Codec unsupported (e.g., HEVC without hardware decode). | Convert video with HandBrake to H.264, or use a player that includes software decoding (VLC). | | Battery drains quickly | High‑resolution video + subtitles + bright screen. | Lower playback resolution (720p) or enable “Battery Saver” mode in the player. |