How to translate video subtitles with AI using your own API key (BYOK)?

DualPiP v1.7+ supports 30+ AI translation providers with a BYOK (Bring Your Own Key) model for subtitle translation. Go to Settings > AI Translation, choose from preset providers like OpenAI GPT, Claude, Gemini, DeepSeek, Groq, Ollama (local), and more, then enter your API key. Each provider supports custom parameters, request headers, and daily usage limits. The system auto-detects movie titles via TMDB and uses translation context history for natural, context-aware bilingual subtitle translations.