docs: Updated README.md.

README.md

@@ -1,4 +1,26 @@
-#
+# nu-ffmpeg
+
+Utility commands for working with ffmpeg in nushell.
+
+## Capabilities
+
+- Return tables from `ffprobe`
+- `ffprobe` multiple files at once
+- Use `streams`, `streams video`, and `streams audio` to filter `ffprobe` output
+- get the `dimensions` of a video stream as a record
+- Apply and parse complex filters to a video (Work In Progress)
+
+## Setup
+
+The `ffmpeg` and `ffprobe` commands are required to be installed and available
+in your path; they are not installed for you.
+
+Currently nushell versions 0.87.0 - 0.88.1 are supported.
+
+After that, clone this repository and add the following code to your scripts,
+or to your `config.nu` file:
 
 ```nu
-use ./ffprobe
+use <path-to-repository>/ffprobe
+use <path-to-repository>/filters *
+```

ffprobe

@@ -4,14 +4,14 @@
 # Multimedia stream analyzer.
 export def main [
   ...input_files: path
-] {
+]: nothing -> table {
   $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 [] {
+export def streams []: table<streams: table, format: record> -> table {
   let streams = ($in | get streams);
 
   match ($streams | describe) {
@@ -21,16 +21,16 @@ export def streams [] {
 }
 
 # Retrieve all the video streams from a list of ffprobe outputs
-export def "streams video" [] {
+export def "streams video" []: table<streams: table, format: record> -> table  {
     $in | streams | where codec_type == "video"
 }
 
 # Retrieve all the audio streams from a list of ffprobe outputs
-export def "streams audio" [] {
+export def "streams audio" []: table<streams: table, format: record> -> table  {
     $in | streams | where codec_type == "audio"
 }
  
 # Get the dimensions of a video stream
-export def "dimensions" [] {
+export def "dimensions" []: table<streams: table, format: record> -> record<width: int, height: int> {
   $in | select width height
 }

filters.nu

@@ -1,22 +1,22 @@
 #!/usr/bin/env -S nu --stdin
 
-def "parse filter" [
+export def "parse filter" [
 ] {
   $in | parse --regex '^(?<name>[^=]+)=(?<params>.*)' | first |
-  update params {|row| $row.params | parse --regex `(?<param>[^=]+)=(?<value>[^:]+):?` }
+  update params { parse --regex `(?<param>[^=]+)=(?<value>[^:]+):?` }
 }
 
-def "filter to-string" [] {
+export def "filter to-string" [] {
   each { |filter| $'($filter.name)=($filter.params | format '{param}={value}')' } |
-  str join ':' 
+  str join ':'
 }
 
-def "complex-filters to-string" [
+export 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 ']['
+      flatten | filter to-string
+    } | update input {
+      str join ']['
     } | format '[{input}]{filters}[{output}]' | str join (";" + (if $pretty_print { "\n"  } else { "" })) | str replace --all '[]' ''
 }

flake.nix

@@ -1,5 +1,5 @@
 {
-  description = "A very basic flake";
+  description = "Utility commands for working with video files in nushell";
 
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";