fixes (desc)

- m3u8 parser
- segments download
- video-audio merge

util/av/merge_segments.go

@@ -0,0 +1,46 @@
+package av
+
+import (
+	"fmt"
+	"os"
+
+	ffmpeg "github.com/u2takey/ffmpeg-go"
+)
+
+func MergeSegments(
+	segmentPaths []string,
+	outputPath string,
+) (string, error) {
+	if len(segmentPaths) == 0 {
+		return "", fmt.Errorf("no segments to merge")
+	}
+	listFilePath := outputPath + ".segments.txt"
+	listFile, err := os.Create(listFilePath)
+	if err != nil {
+		return "", fmt.Errorf("failed to create segment list file: %w", err)
+	}
+	defer listFile.Close()
+	defer os.Remove(listFilePath)
+	for _, segmentPath := range segmentPaths {
+		fmt.Fprintf(listFile, "file '%s'\n", segmentPath)
+	}
+
+	err = ffmpeg.
+		Input(listFilePath, ffmpeg.KwArgs{
+			"f":                  "concat",
+			"safe":               "0",
+			"protocol_whitelist": "file,pipe",
+		}).
+		Output(outputPath, ffmpeg.KwArgs{
+			"c":        "copy",
+			"movflags": "+faststart",
+		}).
+		Silent(true).
+		OverWriteOutput().
+		Run()
+	if err != nil {
+		os.Remove(outputPath)
+		return "", fmt.Errorf("failed to merge segments: %w", err)
+	}
+	return outputPath, nil
+}