From 3feb0c7e1b05552eb49bb468592ef3cdd974c072 Mon Sep 17 00:00:00 2001
From: Davidson Gomes <davidsongviolao@gmail.com>
Date: Tue, 11 Feb 2025 18:36:29 -0300
Subject: [PATCH] feat: improve audio conversion with enhanced ffmpeg
 parameters

- Updated Dockerfile to use Go 1.22
- Refined audio conversion parameters for mp3 and mp4 formats
  - Added specific sample rate, channels, and bitrate settings
  - Used libmp3lame codec for mp3 conversion
  - Improved mp4 audio extraction configuration
---
 Dockerfile |  2 +-
 main.go    | 10 ++++++++--
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/Dockerfile b/Dockerfile
index 12f06dd..0eafdbf 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # Usar uma imagem base do Go
-FROM golang:1.21-alpine
+FROM golang:1.22-alpine
 
 # Instalar ffmpeg
 RUN apk update && apk add --no-cache ffmpeg
diff --git a/main.go b/main.go
index 2140c5e..7faaded 100644
--- a/main.go
+++ b/main.go
@@ -161,9 +161,15 @@ func convertAudio(inputData []byte, format string) ([]byte, int, error) {
 	var cmd *exec.Cmd
 	switch format {
 	case "mp3":
-		cmd = exec.Command("ffmpeg", "-i", "pipe:0", "-f", "mp3", "pipe:1")
+		cmd = exec.Command("ffmpeg", "-i", "pipe:0",
+			"-ar", "44100", // sample rate
+			"-ac", "2", // canais (stereo)
+			"-b:a", "128k", // bitrate
+			"-c:a", "libmp3lame", // codec específico
+			"-f", "mp3", // formato
+			"pipe:1")
 	case "mp4":
-		cmd = exec.Command("ffmpeg", "-i", "pipe:0", "-c:a", "aac", "-f", "mp4", "pipe:1")
+		cmd = exec.Command("ffmpeg", "-i", "pipe:0", "-vn", "-c:a", "aac", "-b:a", "128k", "-f", "adts", "pipe:1")
 	default:
 		cmd = exec.Command("ffmpeg", "-i", "pipe:0", "-ac", "1", "-ar", "16000", "-c:a", "libopus", "-f", "ogg", "pipe:1")
 	}