fftools/ffmpeg: show video stats in progress output without filters

Since ffmpeg 6.1 video stats are accidentally hidden from streamcopy progress output.
This patch re-enables video stats (like frames=) in the progress output.

Signed-off-by: Anton Khirnov <anton@khirnov.net>

fftools/ffmpeg.c

@@ -587,7 +587,7 @@ static void print_report(int is_last_report, int64_t timer_start, int64_t cur_ti
             av_bprintf(&buf_script, "stream_%d_%d_q=%.1f\n",
                        ost->file->index, ost->index, q);
         }
-        if (!vid && ost->type == AVMEDIA_TYPE_VIDEO && ost->filter) {
+        if (!vid && ost->type == AVMEDIA_TYPE_VIDEO) {
             float fps;
             uint64_t frame_number = atomic_load(&ost->packets_written);
 
@@ -601,8 +601,10 @@ static void print_report(int is_last_report, int64_t timer_start, int64_t cur_ti
             if (is_last_report)
                 av_bprintf(&buf, "L");
 
-            nb_frames_dup  = atomic_load(&ost->filter->nb_frames_dup);
-            nb_frames_drop = atomic_load(&ost->filter->nb_frames_drop);
+            if (ost->filter) {
+                nb_frames_dup  = atomic_load(&ost->filter->nb_frames_dup);
+                nb_frames_drop = atomic_load(&ost->filter->nb_frames_drop);
+            }
 
             vid = 1;
         }