FFmpeg CLI reference for video and audio processing, format conversion, filtering, and media automation. Use when converting video formats, resizing or cropping video, trimming by time, replacing or extracting audio, mixing audio tracks, overlaying text or images, burning subtitles, creating GIFs, generating thumbnails, building slideshows, changing playback speed, encoding with H264/H265/VP9, setting CRF/bitrate, using GPU acceleration, creating storyboards, or running ffprobe. Covers filter_complex, stream selectors, -map, -c copy, seeking, scale, pad, crop, concat, drawtext, zoompan, xfade. Do NOT use for image-only processing (use ImageMagick), live-streaming server setup (use OBS/nginx-rtmp), or NLE-style timeline editing (use a video editor).

앱스토어·플레이스토어 등록용 마케팅 스크린샷 자동 생성. 원본 앱 스크린샷에 기기 프레임(iPhone, iPad, Galaxy, Fold, Flip)을 씌우고 배경 그라데이션과 홍보 문구를 얹어 스토어 규격 PNG로 출력한다. Turns raw app screenshots into store-ready App Store & Google Play marketing images — device frames, branded backgrounds, marketing copy, exact store sizes. "스토어 스크린샷 만들어줘", "앱스토어 이미지", "플레이스토어 스크린샷", "make App Store screenshots", "Play Store screenshots" 같은 요청에 사용.