disable by default

src/asses/one.go

@@ -12,8 +12,9 @@ import (
 	"path"
 	"show-rss/src/slow"
 	"strconv"
-   "golang.org/x/time/rate"
 	"time"
+
+	"golang.org/x/time/rate"
 )
 
 var EnvCksumBPS = func() int {
@@ -81,6 +82,11 @@ func One(ctx context.Context, p string) error {
 			return err
 		}
 
+		log.Printf("asses.transcode(%s)...", shortp)
+		if err := transcode(ctx, p); err != nil {
+			return err
+		}
+
 		return nil
 	}(); err != nil {
 		return err

src/asses/one_test.go

@@ -12,6 +12,8 @@ import (
 func TestOne(t *testing.T) {
 	ctx := db.Test(t, context.Background())
 
+	os.Setenv("DO_TRANSCODE", "true")
+
 	d := t.TempDir()
 	b, _ := os.ReadFile(path.Join("testdata", "survivor_au_S11E12.smoller.mkv"))
 	p := path.Join(d, "f.mkv")

src/asses/transcode.go

@@ -0,0 +1,64 @@
+package asses
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"os"
+	"path"
+	"slices"
+	"strings"
+)
+
+func EntrypointTranscode(ctx context.Context, p string) error {
+	return transcode(ctx, p)
+}
+
+func transcode(ctx context.Context, p string) error {
+	if os.Getenv("NO_TRANSCODE") != "" || os.Getenv("DO_TRANSCODE") == "" {
+		log.Printf("would transcode %s but $NO_TRANSCODE=x or $DO_TRANSCODE=", p)
+		return nil
+	}
+
+	output, err := ffprobe(ctx, "-i", p)
+	if err != nil {
+		return err
+	}
+
+	h264 := slices.ContainsFunc(strings.Split(output, "\n"), func(line string) bool {
+		return strings.Contains(line, "tream #") && strings.Contains(line, "Video: ") && strings.Contains(line, "h264")
+	})
+	aac := slices.ContainsFunc(strings.Split(output, "\n"), func(line string) bool {
+		return strings.Contains(line, "tream #") && strings.Contains(line, "Audio: ") && strings.Contains(line, "aac")
+	})
+
+	if h264 && aac {
+		return nil
+	}
+
+	p2 := p + ".en" + path.Ext(p)
+	if err := ffmpeg(ctx, "-y",
+		"-i", p,
+		"-vcodec", "libx264",
+		"-acodec", "aac",
+		p2,
+	); err != nil {
+		return err
+	}
+
+	output2, err := ffprobe(ctx, "-i", p)
+	if err != nil {
+		return err
+	}
+
+	df := func(line string) bool {
+		return !strings.Contains(line, "tream #")
+	}
+	originalStreams := slices.DeleteFunc(strings.Split(output, "\n"), df)
+	newStreams := slices.DeleteFunc(strings.Split(output2, "\n"), df)
+	if len(originalStreams) != len(newStreams) {
+		return fmt.Errorf("stream count changed from transcode")
+	}
+
+	return os.Rename(p2, p)
+}