avconv: deprecate the -deinterlace option

Its quality is horrible, yadif should always be used instead.

avconv.c

@@ -4371,6 +4371,13 @@ static int opt_vsync(const char *opt, const char *arg)
     return 0;
 }
 
+static int opt_deinterlace(const char *opt, const char *arg)
+{
+    av_log(NULL, AV_LOG_WARNING, "-%s is deprecated, use -filter:v yadif instead\n", opt);
+    do_deinterlace = 1;
+    return 0;
+}
+
 #define OFFSET(x) offsetof(OptionsContext, x)
 static const OptionDef options[] = {
     /* main options */
@@ -4435,8 +4442,8 @@ static const OptionDef options[] = {
       "use same quantizer as source (implies VBR)" },
     { "pass", HAS_ARG | OPT_VIDEO, {(void*)opt_pass}, "select the pass number (1 or 2)", "n" },
     { "passlogfile", HAS_ARG | OPT_STRING | OPT_VIDEO, {(void*)&pass_logfilename_prefix}, "select two pass log file name prefix", "prefix" },
-    { "deinterlace", OPT_BOOL | OPT_EXPERT | OPT_VIDEO, {(void*)&do_deinterlace},
+    { "deinterlace", OPT_EXPERT | OPT_VIDEO, {(void*)opt_deinterlace},
-      "deinterlace pictures" },
+      "this option is deprecated, use the yadif filter instead" },
     { "vstats", OPT_EXPERT | OPT_VIDEO, {(void*)&opt_vstats}, "dump video coding statistics to file" },
     { "vstats_file", HAS_ARG | OPT_EXPERT | OPT_VIDEO, {(void*)opt_vstats_file}, "dump video coding statistics to file", "file" },
 #if CONFIG_AVFILTER

doc/avconv.texi

@@ -528,6 +528,8 @@ How strictly to follow the standards.
 
 @item -deinterlace
 Deinterlace pictures.
+This option is deprecated since the deinterlacing is very low quality.
+Use the yadif filter with @code{-filter:v yadif}.
 @item -vstats
 Dump video coding statistics to @file{vstats_HHMMSS.log}.
 @item -vstats_file @var{file}