ffmpeg: drop the -deinterlace option

It is undocumented and has been deprecated since 2013.

fftools/ffmpeg_filter.c

@@ -805,23 +805,6 @@ static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
             return ret;
     }
 
-    if (do_deinterlace) {
-        AVFilterContext *yadif;
-
-        snprintf(name, sizeof(name), "deinterlace_in_%d_%d",
-                 ist->file_index, ist->st->index);
-        if ((ret = avfilter_graph_create_filter(&yadif,
-                                                avfilter_get_by_name("yadif"),
-                                                name, "", NULL,
-                                                fg->graph)) < 0)
-            return ret;
-
-        if ((ret = avfilter_link(last_filter, 0, yadif, 0)) < 0)
-            return ret;
-
-        last_filter = yadif;
-    }
-
     snprintf(name, sizeof(name), "trim_in_%d_%d",
              ist->file_index, ist->st->index);
     if (copy_ts) {

fftools/ffmpeg_opt.c

@@ -153,7 +153,6 @@ int audio_volume      = 256;
 int audio_sync_method = 0;
 int video_sync_method = VSYNC_AUTO;
 float frame_drop_threshold = 0;
-int do_deinterlace    = 0;
 int do_benchmark      = 0;
 int do_benchmark_all  = 0;
 int do_hex_dump       = 0;
@@ -3788,8 +3787,6 @@ const OptionDef options[] = {
     { "passlogfile",  OPT_VIDEO | HAS_ARG | OPT_STRING | OPT_EXPERT | OPT_SPEC |
                       OPT_OUTPUT,                                                { .off = OFFSET(passlogfiles) },
         "select two pass log file name prefix", "prefix" },
-    { "deinterlace",  OPT_VIDEO | OPT_BOOL | OPT_EXPERT,                         { &do_deinterlace },
-        "this option is deprecated, use the yadif filter instead" },
     { "psnr",         OPT_VIDEO | OPT_BOOL | OPT_EXPERT,                         { &do_psnr },
         "calculate PSNR of compressed frames" },
     { "vstats",       OPT_VIDEO | OPT_EXPERT ,                                   { .func_arg = opt_vstats },