fix: improve FFmpeg output parsing for resolution detection

internal/encoder/encoder.go

@@ -42,10 +42,19 @@ func (e *Encoder) GetMediaInfo(path string) (width, height int, interlaced bool,
 	n, _ := output.Read(buf)
 	output.Close()
 
-	var w, h int
-	fmt.Sscanf(string(buf[:n]), "%dx%d", &w, &h)
+	outputStr := string(buf[:n])
 
-	interlaced = strings.Contains(string(buf[:n]), "TFF") || strings.Contains(string(buf[:n]), "BFF")
+	var w, h int
+	for i := 0; i < len(outputStr)-10; i++ {
+		if outputStr[i] >= '0' && outputStr[i] <= '9' {
+			fmt.Sscanf(outputStr[i:], "%dx%d", &w, &h)
+			if w > 0 && h > 0 {
+				break
+			}
+		}
+	}
+
+	interlaced = strings.Contains(outputStr, "TFF") || strings.Contains(outputStr, "BFF")
 
 	return w, h, interlaced, nil
 }