[IMPROVEMENT] Clarify CEA-608/708 Subtitle Extraction Behavior #1448 (#1663)

* made changes to the file src/lib_ccx/params.c

* made changes to the help message.

Author: tank0nf

src/lib_ccx/params.c

@@ -969,17 +969,17 @@ void print_usage(void)
 	mprint("  You can adjust, or disable, the algorithm settings with the following\n");
 	mprint("  parameters.\n");
 	mprint("\n");
-	mprint("Notes on times:\n"
-	       "  --startat and --endat times are used first, then -delay.\n");
+	mprint("Notes on times:\n");
+	mprint("  --startat and --endat times are used first, then -delay.\n");
 	mprint("  So if you use --srt -startat 3:00 --endat 5:00 --delay 120000, ccextractor will\n");
 	mprint("  generate a .srt file, with only data from 3:00 to 5:00 in the input file(s)\n");
 	mprint("  and then add that (huge) delay, which would make the final file start at\n");
 	mprint("  5:00 and end at 7:00.\n");
 	mprint("\n");
 	mprint("Notes on codec options:\n");
-	mprint("  If codec type is not selected then first elementary stream suitable for \n"
-	       "  subtitle is selected, please consider --teletext -noteletext override this\n"
-	       "  option.\n");
+	mprint("  If codec type is not selected then first elementary stream suitable for\n");
+	mprint("  subtitle is selected, please consider --teletext --noteletext override this\n");
+	mprint("  option.\n");
 	mprint("  no-codec and codec parameter must not be same if found to be same \n"
 	       "  then parameter of no-codec is ignored, this flag should be passed \n"
 	       "  once, more then one are not supported yet and last parameter would \n"
@@ -992,8 +992,14 @@ void print_usage(void)
 	mprint("  The start window must be between the times given and must have enough time\n");
 	mprint("  to display the message for at least the specified time.\n");
 	mprint("\n");
-	mprint("Notes on the CEA-708 decoder:\n"
-	       "  While it is starting to be useful, it's\n");
+	mprint("Notes on the CEA-708 decoder:\n");
+	mprint("  By default, ccextractor now extracts both CEA-608 and CEA-708 subtitles\n");
+	mprint("  if they are present in the input. This results in two output files: one\n");
+	mprint("  for CEA-608 and one for CEA-708.\n");
+	mprint("  To extract only CEA-608 subtitles, use -1, -2, or -12.\n");
+	mprint("  To extract only CEA-708 subtitles, use -svc.\n");
+	mprint("  To extract both CEA-608 and CEA-708 subtitles, use both -1/-2/-12 and -svc.\n\n");
+	mprint("  While it is starting to be useful, it's\n");
 	mprint("  a work in progress. A number of things don't work yet in the decoder\n");
 	mprint("  itself, and many of the auxiliary tools (case conversion to name one)\n");
 	mprint("  won't do anything yet. Feel free to submit samples that cause problems\n");

src/rust/src/args.rs

@@ -104,6 +104,12 @@ Notes on adding credits:
   to display the message for at least the specified time.
 
 Notes on the CEA-708 decoder:
+	By default, ccextractor now extracts both CEA-608 and CEA-708 subtitles
+	if they are present in the input. This results in two output files: one
+	for CEA-608 and one for CEA-708.
+	To extract only CEA-608 subtitles, use -1, -2, or -12.
+	To extract only CEA-708 subtitles, use -svc.
+	To extract both CEA-608 and CEA-708 subtitles, use both -1/-2/-12 and -svc.
   While it is starting to be useful, it's
   a work in progress. A number of things don't work yet in the decoder
   itself, and many of the auxiliary tools (case conversion to name one)