Clarify the documentation for 'ffmpeg -v'.

patch by Stefano Sabatini, stefano.sabatini-lala poste it

Originally committed as revision 12216 to svn://svn.ffmpeg.org/ffmpeg/trunk

doc/ffmpeg-doc.texi

@@ -255,8 +255,8 @@ Set the track.
 @item -year number
 Set the year.
 
-@item -v verbose
-Control amount of logging.
+@item -v number
+Set the logging verbosity level.
 
 @item -target type
 Specify target file type ("vcd", "svcd", "dvd", "dv", "dv50", "pal-vcd",

ffmpeg.c

@@ -3756,7 +3756,7 @@ const OptionDef options[] = {
     { "re", OPT_BOOL | OPT_EXPERT, {(void*)&rate_emu}, "read input at native frame rate", "" },
     { "loop_input", OPT_BOOL | OPT_EXPERT, {(void*)&loop_input}, "loop (current only works with images)" },
     { "loop_output", HAS_ARG | OPT_INT | OPT_EXPERT, {(void*)&loop_output}, "number of times to loop output in formats that support looping (0 loops forever)", "" },
-    { "v", HAS_ARG, {(void*)opt_verbose}, "control amount of logging", "verbose" },
+    { "v", HAS_ARG, {(void*)opt_verbose}, "set the logging verbosity level", "number" },
     { "target", HAS_ARG, {(void*)opt_target}, "specify target file type (\"vcd\", \"svcd\", \"dvd\", \"dv\", \"dv50\", \"pal-vcd\", \"ntsc-svcd\", ...)", "type" },
     { "threads", HAS_ARG | OPT_EXPERT, {(void*)opt_thread_count}, "thread count", "count" },
     { "vsync", HAS_ARG | OPT_INT | OPT_EXPERT, {(void*)&video_sync_method}, "video sync method", "" },