baz preview [options]

Option	Description
`--frame <number>`	Frame number to render (default: middle of video)
`--frames <list>`	Comma-separated frame numbers (e.g., 0,150,500)
`--output <path>`	Write PNG to a local file, or to <dir>/frame-<N>.png when the path is a directory
`-h, --help`	display help for command

Examples:
  baz preview --frame 40 --output shot.png
  baz preview --frames 0,40,75 --output ./frames     writes ./frames/frame-0.png, frame-40.png, frame-75.png

--output with --frames must be a directory (created if missing). A file path with several frames exits 64.