FFmpeg: Add tests, refactor package, and split into sub-packages #4604

Signed-off-by: Michael Mayer <michael@photoprism.app>

internal/ffmpeg/encode/encoder_test.go

@@ -0,0 +1,19 @@
+package encode
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestFindEncoder(t *testing.T) {
+	t.Run("software", func(t *testing.T) {
+		assert.Equal(t, "libx264", FindEncoder("software").String())
+	})
+	t.Run("apple", func(t *testing.T) {
+		assert.Equal(t, "h264_videotoolbox", FindEncoder("apple").String())
+	})
+	t.Run("unsupported", func(t *testing.T) {
+		assert.Equal(t, "libx264", FindEncoder("xxx").String())
+	})
+}