Fix .mts duration parsing by extracting leading digits

This update addresses a parsing issue for .mts files by introducing a fallback to extract and parse only the leading digits when converting frame data to a float. A new helper function `getFirstDigits` is added to isolate and handle numeric values correctly.

kernel/convertor.go

@@ -11,6 +11,7 @@ import (
 	"regexp"
 	"strconv"
 	"strings"
+	"unicode"
 )
 
 type File struct {
@@ -126,7 +127,13 @@ func (s Convertor) GetTotalDuration(file *File) (duration float64, err error) {
 	if len(frames) == 0 {
 		return s.getAlternativeTotalDuration(file)
 	}
-	return strconv.ParseFloat(frames, 64)
+
+	duration, err = strconv.ParseFloat(frames, 64)
+	if err != nil {
+		// fix .mts duration
+		return strconv.ParseFloat(getFirstDigits(frames), 64)
+	}
+	return duration, err
 }
 
 func (s Convertor) getAlternativeTotalDuration(file *File) (duration float64, err error) {
@@ -241,3 +248,15 @@ func (s Convertor) GetSupportFormats() (encoder.ConvertorFormatsContract, error)
 func (s Convertor) GetRunningProcesses() map[int]*exec.Cmd {
 	return s.runningProcesses.items
 }
+
+func getFirstDigits(s string) string {
+	result := ""
+	for _, r := range s {
+		if unicode.IsDigit(r) {
+			result += string(r)
+		} else {
+			break
+		}
+	}
+	return result
+}