add: run video in pipe

internal/watcher/config/config.go

@@ -0,0 +1,57 @@
+// Package config handles loading the config.
+package config
+
+import (
+	"flag"
+	"fmt"
+	"os"
+
+	"gopkg.in/yaml.v3"
+)
+
+var Default *Mod
+
+type Cmd struct {
+	Binary    string
+	Arguments []string
+}
+
+type Config struct {
+	H264Cmd *Cmd `yaml:"h264"`
+	IVFCmd  *Cmd `yaml:"ivf"`
+}
+
+func New(source []byte) (*Config, error) {
+	config := &Config{}
+	if err := yaml.Unmarshal(source, config); err != nil {
+		return nil, fmt.Errorf("failed to parse config: %w", err)
+	}
+	return config, nil
+}
+
+type Mod struct {
+	filePath string
+}
+
+func (m *Mod) RegisterFlags(fs *flag.FlagSet) {
+	fs.StringVar(&m.filePath, "watcher_config", "", "path to the watcher configuration")
+}
+
+func (m *Mod) Get() (*Config, error) {
+	bytes, err := os.ReadFile(m.filePath)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read file %q: %w", m.filePath, err)
+	}
+
+	config, err := New(bytes)
+	if err != nil {
+		return nil, err
+	}
+
+	return config, nil
+}
+
+func init() {
+	Default = &Mod{}
+	Default.RegisterFlags(flag.CommandLine)
+}