doc/ffmpeg: -timelimit is in user time

Signed-off-by: Lou Logan <lou@lrcd.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

doc/ffmpeg.texi

@@ -1383,7 +1383,7 @@ it will usually display as 0 if not supported.
 Show benchmarking information during the encode.
 Shows real, system and user time used in various steps (audio/video encode/decode).
 @item -timelimit @var{duration} (@emph{global})
-Exit after ffmpeg has been running for @var{duration} seconds.
+Exit after ffmpeg has been running for @var{duration} seconds in CPU user time.
 @item -dump (@emph{global})
 Dump each input packet to stderr.
 @item -hex (@emph{global})

fftools/ffmpeg_opt.c

@@ -3443,7 +3443,7 @@ const OptionDef options[] = {
     { "stdin",          OPT_BOOL | OPT_EXPERT,                       { &stdin_interaction },
       "enable or disable interaction on standard input" },
     { "timelimit",      HAS_ARG | OPT_EXPERT,                        { .func_arg = opt_timelimit },
-        "set max runtime in seconds", "limit" },
+        "set max runtime in seconds in CPU user time", "limit" },
     { "dump",           OPT_BOOL | OPT_EXPERT,                       { &do_pkt_dump },
         "dump each input packet" },
     { "hex",            OPT_BOOL | OPT_EXPERT,                       { &do_hex_dump },