ffplay: pass all sws options to the filter graph

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

ffplay.c

@@ -1787,15 +1787,23 @@ fail:
 static int configure_video_filters(AVFilterGraph *graph, VideoState *is, const char *vfilters, AVFrame *frame)
 {
     static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE };
-    char sws_flags_str[128];
+    char sws_flags_str[512] = "";
     char buffersrc_args[256];
     int ret;
     AVFilterContext *filt_src = NULL, *filt_out = NULL, *last_filter = NULL;
     AVCodecContext *codec = is->video_st->codec;
     AVRational fr = av_guess_frame_rate(is->ic, is->video_st, NULL);
+    AVDictionaryEntry *e = NULL;
+
+    while ((e = av_dict_get(sws_dict, "", e, AV_DICT_IGNORE_SUFFIX))) {
+        if (!strcmp(e->key, "sws_flags")) {
+            av_strlcatf(sws_flags_str, sizeof(sws_flags_str), "%s=%s:", "flags", e->value);
+        } else
+            av_strlcatf(sws_flags_str, sizeof(sws_flags_str), "%s=%s:", e->key, e->value);
+    }
+    if (strlen(sws_flags_str))
+        sws_flags_str[strlen(sws_flags_str)-1] = '\0';
 
-    av_opt_get_int(sws_opts, "sws_flags", 0, &sws_flags);
-    snprintf(sws_flags_str, sizeof(sws_flags_str), "flags=%"PRId64, sws_flags);
     graph->scale_sws_opts = av_strdup(sws_flags_str);
 
     snprintf(buffersrc_args, sizeof(buffersrc_args),