avconv: deprecate -isync.

This option does not do anything.

Also remove OPT_GRAB, since -isync is the last option using it.

avconv_opt.c

@@ -1795,28 +1795,24 @@ static int show_help(const char *opt, const char *arg)
     av_log_set_callback(log_callback_help);
     show_usage();
     show_help_options(options, "Main options:\n",
-                      OPT_EXPERT | OPT_AUDIO | OPT_VIDEO | OPT_SUBTITLE | OPT_GRAB, 0);
+                      OPT_EXPERT | OPT_AUDIO | OPT_VIDEO | OPT_SUBTITLE, 0);
     show_help_options(options, "\nAdvanced options:\n",
-                      OPT_EXPERT | OPT_AUDIO | OPT_VIDEO | OPT_SUBTITLE | OPT_GRAB,
+                      OPT_EXPERT | OPT_AUDIO | OPT_VIDEO | OPT_SUBTITLE,
                       OPT_EXPERT);
     show_help_options(options, "\nVideo options:\n",
-                      OPT_EXPERT | OPT_AUDIO | OPT_VIDEO | OPT_GRAB,
+                      OPT_EXPERT | OPT_AUDIO | OPT_VIDEO,
                       OPT_VIDEO);
     show_help_options(options, "\nAdvanced Video options:\n",
-                      OPT_EXPERT | OPT_AUDIO | OPT_VIDEO | OPT_GRAB,
+                      OPT_EXPERT | OPT_AUDIO | OPT_VIDEO,
                       OPT_VIDEO | OPT_EXPERT);
     show_help_options(options, "\nAudio options:\n",
-                      OPT_EXPERT | OPT_AUDIO | OPT_VIDEO | OPT_GRAB,
+                      OPT_EXPERT | OPT_AUDIO | OPT_VIDEO,
                       OPT_AUDIO);
     show_help_options(options, "\nAdvanced Audio options:\n",
-                      OPT_EXPERT | OPT_AUDIO | OPT_VIDEO | OPT_GRAB,
+                      OPT_EXPERT | OPT_AUDIO | OPT_VIDEO,
                       OPT_AUDIO | OPT_EXPERT);
     show_help_options(options, "\nSubtitle options:\n",
-                      OPT_SUBTITLE | OPT_GRAB,
-                      OPT_SUBTITLE);
-    show_help_options(options, "\nAudio/Video grab options:\n",
-                      OPT_GRAB,
-                      OPT_GRAB);
+                      OPT_SUBTITLE, OPT_SUBTITLE);
     printf("\n");
     show_help_children(avcodec_get_class(), flags);
     show_help_children(avformat_get_class(), flags);
@@ -2008,7 +2004,7 @@ const OptionDef options[] = {
         , "force subtitle tag/fourcc", "fourcc/tag" },
 
     /* grab options */
-    { "isync", OPT_BOOL | OPT_EXPERT | OPT_GRAB, { &input_sync }, "sync read on input", "" },
+    { "isync", OPT_BOOL | OPT_EXPERT, { &input_sync }, "this option is deprecated and does nothing", "" },
 
     /* muxer options */
     { "muxdelay",   OPT_FLOAT | HAS_ARG | OPT_EXPERT | OPT_OFFSET, { .off = OFFSET(mux_max_delay) },

cmdutils.h

@@ -130,7 +130,6 @@ typedef struct {
 #define OPT_STRING 0x0008
 #define OPT_VIDEO  0x0010
 #define OPT_AUDIO  0x0020
-#define OPT_GRAB   0x0040
 #define OPT_INT    0x0080
 #define OPT_FLOAT  0x0100
 #define OPT_SUBTITLE 0x0200

doc/avconv.texi

@@ -595,13 +595,6 @@ Set the subtitle codec. This is an alias for @code{-codec:s}.
 Disable subtitle recording.
 @end table
 
-@section Audio/Video grab options
-
-@table @option
-@item -isync (@emph{global})
-Synchronize read on input.
-@end table
-
 @section Advanced options
 
 @table @option