ffmpeg: cosmetics to reduce difference to qatar by about 90 lines

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

ffmpeg.c

@@ -1959,6 +1959,7 @@ static void do_video_out(AVFormatContext *s, OutputStream *ost,
                          AVFrame *in_picture, float quality)
 {
     int nb_frames, i, ret, format_video_sync;
+    AVPacket pkt;
     AVCodecContext *enc;
     double sync_ipts, delta;
     double duration = 0;
@@ -2015,9 +2016,8 @@ static void do_video_out(AVFormatContext *s, OutputStream *ost,
         av_log(NULL, AV_LOG_VERBOSE, "*** %d dup!\n", nb_frames - 1);
     }
 
-    /* duplicates frame if needed */
-    for (i = 0; i < nb_frames; i++) {
-        AVPacket pkt;
+
+duplicate_frame:
     av_init_packet(&pkt);
     pkt.data = NULL;
     pkt.size = 0;
@@ -2103,7 +2103,10 @@ static void do_video_out(AVFormatContext *s, OutputStream *ost,
      * flush, we need to limit them here, before they go into encoder.
      */
     ost->frame_number++;
-    }
+
+    if(--nb_frames)
+        goto duplicate_frame;
+
     if (vstats_filename && frame_size)
         do_video_stats(output_files[ost->file_index]->ctx, ost, frame_size);
 }