feat: Initial commit.

.envrc

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+use flake;

.gitignore

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+.direnv

README.md

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+#
+
+```nu
+use ./ffprobe

ffprobe

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+#!/usr/bin/env nu
+# vim: filetype=nu :
+
+# Multimedia stream analyzer.
+export def main [
+  ...input_files: path
+] {
+  $input_files | each {
+    ^ffprobe -v quiet -print_format json -show_format -show_streams $in | from json
+  }
+}
+
+# Retrieve all the streams from a list of ffprobe outputs
+export def streams [] {
+  let streams = ($in | get streams);
+
+  match ($streams | describe) {
+    'list<list<any>>' => ($streams | flatten),
+    _ => $streams
+  }
+}
+
+# Retrieve all the video streams from a list of ffprobe outputs
+export def "streams video" [] {
+    $in | streams | where codec_type == "video"
+}
+
+# Retrieve all the audio streams from a list of ffprobe outputs
+export def "streams audio" [] {
+    $in | streams | where codec_type == "audio"
+}
+ 
+# Get the dimensions of a video stream
+export def "dimensions" [] {
+  $in | select width height
+}

filters.nu

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+#!/usr/bin/env -S nu --stdin
+
+def "parse filter" [
+] {
+  $in | parse --regex '^(?<name>[^=]+)=(?<params>.*)' | first |
+  update params {|row| $row.params | parse --regex `(?<param>[^=]+)=(?<value>[^:]+):?` }
+}
+
+def "filter to-string" [] {
+  each { |filter| $'($filter.name)=($filter.params | format '{param}={value}')' } |
+  str join ':' 
+}
+
+def "complex-filters to-string" [
+  --pretty-print (-p)
+]: table<input: list<string>, filters: table<name: string, params: table<param: string, value: string>>, output: string> -> string {
+    $in | update filters {
+      |$row| $row.filters | flatten | filter to-string
+    } | update input { |row|
+      $row.input | str join ']['
+    } | format '[{input}]{filters}[{output}]' | str join (";" + (if $pretty_print { "\n"  } else { "" })) | str replace --all '[]' ''
+}

flake.lock

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+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1704538339,
+        "narHash": "sha256-1734d3mQuux9ySvwf6axRWZRBhtcZA9Q8eftD6EZg6U=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "46ae0210ce163b3cba6c7da08840c1d63de9c701",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "A very basic flake";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  };
+
+  outputs = { self, nixpkgs }:
+    let
+      pkgs = nixpkgs.legacyPackages.x86_64-linux;
+    in
+    {
+      devShells.x86_64-linux.default = pkgs.mkShell {
+        packages = with pkgs; [
+          ffmpeg
+
+          sbcl
+
+          nushellFull
+        ];
+      };
+    };
+}