Remove field that ffmpeg 5.0 doesn't have.

src/zm_ffmpeg.cpp

@@ -257,8 +257,8 @@ void zm_dump_stream_format(AVFormatContext *ic, int i, int index, int is_output)
     Debug(1, "ids [0x%x]", st->id);
   if (lang)
     Debug(1, "language (%s)", lang->value);
-  Debug(1, "frames:%d, frame_size:%d stream timebase: %d/%d",
-      st->codec_info_nb_frames, codec->frame_size,
+  Debug(1, "frame_size:%d stream timebase: %d/%d",
+      codec->frame_size,
       st->time_base.num, st->time_base.den
       );