h264: Detect POC inconsistencies and try to handle them reasonably

Improves the file from Ticket2050
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/h264.c

@@ -1517,7 +1517,13 @@ static void decode_postinit(H264Context *h, int setup_finished)
     if(   cur->f.pict_type == AV_PICTURE_TYPE_B
        || (h->last_pocs[MAX_DELAYED_PIC_COUNT-2] > INT_MIN && h->last_pocs[MAX_DELAYED_PIC_COUNT-1] - h->last_pocs[MAX_DELAYED_PIC_COUNT-2] > 2))
         out_of_order = FFMAX(out_of_order, 1);
-    if(s->avctx->has_b_frames < out_of_order && !h->sps.bitstream_restriction_flag){
+    if (out_of_order == MAX_DELAYED_PIC_COUNT) {
+        av_log(s->avctx, AV_LOG_VERBOSE, "Invalid POC %d<%d\n", cur->poc, h->last_pocs[0]);
+        for (i = 1; i < MAX_DELAYED_PIC_COUNT; i++)
+            h->last_pocs[i] = INT_MIN;
+        h->last_pocs[0] = cur->poc;
+        cur->mmco_reset = 1;
+    } else if(s->avctx->has_b_frames < out_of_order && !h->sps.bitstream_restriction_flag){
         av_log(s->avctx, AV_LOG_VERBOSE, "Increasing reorder buffer to %d\n", out_of_order);
         s->avctx->has_b_frames = out_of_order;
         s->low_delay = 0;