Process audio by ffmpeg in Golang

.go

tempDirLoc := os.TempDir()
tempFile, err := os.CreateTemp(tempDirLoc, "audio-*.mp3")
if err != nil {
  fmt.Println(err)
}

defer tempFile.Close()

fileBytes, err := io.ReadAll(input.Audiofile.File) // from multipart form
if err != nil {
  fmt.Println(err)
}
tempFile.Write(fileBytes)

defer os.Remove(tempFile.Name())

fmt.Println("Open:", tempFile.Name())

// ffmpeg -y -i FILE -map 0:a -c:a copy -map_metadata -1 FILE
ffErr := ffmpeg.Input(tempFile.Name()).
  Output(tempDirLoc+"/result.mp3", ffmpeg.KwArgs{"map": "0:a", "c:a": "copy", "map_metadata": -1}).
  OverWriteOutput().ErrorToStdOut().Run()

if ffErr != nil {
  fmt.Println(ffErr)
}

data, err := ffmpeg.Probe(tempDirLoc + "/result.mp3")
if err != nil {
  panic(err)
}

log.Println("got audio info", data)

type AudioInfo struct {
  Streams []struct {
    CodecType string `json:"codec_type"`
    CodecName string `json:"codec_name"`
  } `json:"streams"`
  Format struct {
    Duration string `json:"duration"`
  } `json:"format"`
}
ai := &AudioInfo{}
err = json.Unmarshal([]byte(data), ai)
if err != nil {
  panic(err)
}

duration := ai.Format.Duration
codecType := ai.Streams[0].CodecType
codecName := ai.Streams[0].CodecName

fmt.Printf("Final info --> CodecType: %s, CodecName: %s, duration: %s\n", codecType, codecName, duration)