fix: restore working crop scale filters for video to avoid exit status 8

helper/media_convert.go

@@ -14,17 +14,21 @@ func ConvertImageToWebp(imgData []byte) ([]byte, error) {
 	convertCmd := exec.Command("convert", "-", "-resize", "512x512", "-background", "none", "-compose", "Copy", "-gravity", "center", "-extent", "512x512", "-quality", "100", "png:-")
 	convertCmd.Stdin = bytes.NewReader(imgData)
 	var convertBuf bytes.Buffer
+	var stderr bytes.Buffer
 	convertCmd.Stdout = &convertBuf
+	convertCmd.Stderr = &stderr
 	if err := convertCmd.Run(); err != nil {
-		return nil, fmt.Errorf("convert failed: %w", err)
+		return nil, fmt.Errorf("convert failed: %w, stderr: %s", err, stderr.String())
 	}
 
 	cwebpCmd := exec.Command("cwebp", "-quiet", "-mt", "-exact", "-q", "100", "-m", "6", "-alpha_q", "100", "-o", "-", "--", "-")
 	cwebpCmd.Stdin = &convertBuf
 	var cwebpBuf bytes.Buffer
+	var cwebStderr bytes.Buffer
 	cwebpCmd.Stdout = &cwebpBuf
+	cwebpCmd.Stderr = &cwebStderr
 	if err := cwebpCmd.Run(); err != nil {
-		return nil, fmt.Errorf("cwebp failed: %w", err)
+		return nil, fmt.Errorf("cwebp failed: %w, stderr: %s", err, cwebStderr.String())
 	}
 
 	return cwebpBuf.Bytes(), nil
@@ -41,12 +45,14 @@ func ConvertVideoToWebp(vidData []byte) ([]byte, error) {
 		"-vf", "fps=10,scale=720:-1:flags=lanczos:force_original_aspect_ratio=increase,crop=512:512,pad=512:512:(ow-iw)/2:(oh-ih)/2:color=#00000000,setsar=1",
 		"-compression_level", "6",
 		"-q:v", "60", "-loop", "0",
-		"-preset", "picture", "-an", "-fps_mode", "auto",
+		"-preset", "picture", "-an",
 		"-f", "webp", webpPath,
 	)
+	var stderr bytes.Buffer
+	ffmpegCmd.Stderr = &stderr
 	ffmpegCmd.Stdin = bytes.NewReader(vidData)
 	if err := ffmpegCmd.Run(); err != nil {
-		return nil, fmt.Errorf("ffmpeg failed: %w", err)
+		return nil, fmt.Errorf("ffmpeg failed: %w, stderr: %s", err, stderr.String())
 	}
 
 	return os.ReadFile(webpPath)