FFmpeg

**Quick judgment** A strong, focused FFmpeg helper that encodes many real-world best practices for video/audio processing. It appears particularly useful for generating correct, efficient FFmpeg commands across common editing, transcoding, and packaging scenarios. **What it’s good for** - Constructing non-trivial FFmpeg commands that handle seeking, mapping, encoding, filtering, concatenation, and subtitles correctly. - Avoiding frequent FFmpeg pitfalls (e.g., -ss placement, forgetting `-c copy`, stream selection surprises, filter/`-c copy` conflicts). - Optimizing for quality vs size vs speed (CRF vs bitrate, presets, hardware acceleration) in a principled way. **Key risks / limitations** - FFmpeg is powerful but unforgiving: incorrect commands can silently degrade quality or strip streams; users should still inspect outputs and keep originals. - Complex edge cases (exotic codecs/containers, HDR, broadcast workflows, live streaming) may require additional expertise beyond what’s shown here. - Overwriting existing files or misusing `-c copy` vs re-encoding remains a user risk if not carefully reviewed. **Recommended scenarios** Use this skill when you need to: - Translate high-level editing/transcoding goals into concrete FFmpeg commands. - Batch-process media with consistent, well-tuned parameters. - Troubleshoot why naive FFmpeg commands are slow, desynchronized, or produce unexpected streams, and replace them with more robust pipelines.