avcodec/mpegvideo_enc: fix frame skipping with intra only codecs

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/mpegvideo.c

@@ -2655,7 +2655,9 @@ FF_ENABLE_DEPRECATION_WARNINGS
     else if (!is_mpeg12 && (s->h263_pred || s->h263_aic))
         s->mbintra_table[mb_xy]=1;
 
-    if ((s->flags&CODEC_FLAG_PSNR) || !(s->encoding && (s->intra_only || s->pict_type==AV_PICTURE_TYPE_B) && s->avctx->mb_decision != FF_MB_DECISION_RD)) { //FIXME precalc
+    if (   (s->flags&CODEC_FLAG_PSNR)
+        || s->avctx->frame_skip_threshold || s->avctx->frame_skip_factor
+        || !(s->encoding && (s->intra_only || s->pict_type==AV_PICTURE_TYPE_B) && s->avctx->mb_decision != FF_MB_DECISION_RD)) { //FIXME precalc
         uint8_t *dest_y, *dest_cb, *dest_cr;
         int dct_linesize, dct_offset;
         op_pixels_func (*op_pix)[4];

libavcodec/mpegvideo_enc.c

@@ -1300,6 +1300,20 @@ static int select_input_picture(MpegEncContext *s)
 
     /* set next picture type & ordering */
     if (s->reordered_input_picture[0] == NULL && s->input_picture[0]) {
+        if (s->avctx->frame_skip_threshold || s->avctx->frame_skip_factor) {
+            if (s->picture_in_gop_number < s->gop_size &&
+                s->next_picture_ptr &&
+                skip_check(s, s->input_picture[0], s->next_picture_ptr)) {
+                // FIXME check that te gop check above is +-1 correct
+                av_frame_unref(&s->input_picture[0]->f);
+
+                emms_c();
+                ff_vbv_update(s, 0);
+
+                goto no_output_pic;
+            }
+        }
+
         if (/*s->picture_in_gop_number >= s->gop_size ||*/
             s->next_picture_ptr == NULL || s->intra_only) {
             s->reordered_input_picture[0] = s->input_picture[0];
@@ -1309,19 +1323,6 @@ static int select_input_picture(MpegEncContext *s)
         } else {
             int b_frames;
 
-            if (s->avctx->frame_skip_threshold || s->avctx->frame_skip_factor) {
-                if (s->picture_in_gop_number < s->gop_size &&
-                    skip_check(s, s->input_picture[0], s->next_picture_ptr)) {
-                    // FIXME check that te gop check above is +-1 correct
-                    av_frame_unref(&s->input_picture[0]->f);
-
-                    emms_c();
-                    ff_vbv_update(s, 0);
-
-                    goto no_output_pic;
-                }
-            }
-
             if (s->flags & CODEC_FLAG_PASS2) {
                 for (i = 0; i < s->max_b_frames + 1; i++) {
                     int pict_num = s->input_picture[0]->f.display_picture_number + i;