for only convert mp4,only get the codec,don't get the true duration

@@ -337,6 +337,24 @@ float parse_ffmpeg_duration(const char * file, bool * beH264 = NULL)
 	return hour * 3600 + minute * 60 + sec;
 }
 
+float get_mp4_duration_from_header(const char *mediafile, bool * bH264)
+{
+	char buf[2048];
+
+#ifdef WIN32
+	sprintf(buf, "ffmpeg -i %s > %s.txt 2>&1", mediafile, mediafile);
+#else
+	sprintf(buf, "ffmpeg -i %s &> %s.txt", mediafile, mediafile);
+#endif
+
+	run_shell_cmd(buf);
+
+
+	sprintf(buf, "%s.txt", mediafile);
+	return parse_ffmpeg_duration(buf, bH264);
+}
+
+//because the duration in mp4 header is wrong in some file,so convert it to ts and to mkv to get the right duration
 float get_mp4_duration(const char *mediafile, bool bVideo, bool * bH264)
 {
 	char buf[2048];
@@ -382,6 +400,40 @@ float get_mp4_duration(const char *mediafile, bool bVideo, bool * bH264)
 #define strcasecmp _stricmp 
 #endif
 
+float get_file_codec_h264(const char *mediafile, bool * beH264 = NULL)
+{
+	char buf[2048];
+	int len = strlen(mediafile);
+	if (len > 3) {
+		if (!strcasecmp(mediafile + len - 4, ".mp4")) {
+			return get_mp4_duration_from_header(mediafile, beH264);
+		}
+	}
+
+	sprintf(buf, "ffmpeg -y -i %s -acodec copy -vcodec copy %s.mkv", mediafile, mediafile);
+
+
+	run_shell_cmd(buf);
+#ifdef WIN32
+	sprintf(buf, "ffmpeg -i %s.mkv > %s.txt 2>&1", mediafile, mediafile);
+#else
+	sprintf(buf, "ffmpeg -i %s.mkv &> %s.txt", mediafile, mediafile);
+#endif
+
+	run_shell_cmd(buf);
+
+	if (!keep_tmp_files) {
+		char buf[2048];
+		sprintf(buf, "%s.mkv", mediafile);
+		remove_file(buf);
+	}
+
+
+	sprintf(buf, "%s.txt", mediafile);
+	float duration = parse_ffmpeg_duration(buf, beH264);
+	return duration;
+}
+
 float get_file_duration(const char *mediafile, bool bVideo, bool * beH264 = NULL)
 {
 	char buf[2048];
@@ -438,6 +490,23 @@ void get_duration_from_video_file()
 	only_print = tmp;
 }
 
+void get_video_codec_h264()
+{
+	bool tmp = only_print;
+	only_print = false;
+
+	for (int i = 0; i < media_files.size(); i++){
+		if (media_files[i].m_type == mt_video) {
+			bool bH264 = false;
+
+			get_file_codec_h264(media_files[i].name.c_str(),&bH264);
+
+			media_files[i].is_h264 = bH264;
+		}
+	}
+
+	only_print = tmp;
+}
 
 void check_audio_duration()
 {
@@ -546,8 +615,13 @@ void init()
 	strcpy(silence_aac_file, cfg_path);
 	strcat(silence_aac_file, "silence.aac");
 
+	if (only_convert_mp4) {
+		get_video_codec_h264();
+	}
+	else {
 		check_audio_duration();
 		get_duration_from_video_file();
+	}
 
 	add_media_infos();