improved VCD support patch by ("Hauke Duden" <H.NS.Duden at gmx dot net>)

  - the first audio and video packs now contain only a system header and lots
  of padding.
  - no system headers in any packs other than the first ones
  - the two system headers only contain information about "their" stream
  - fixed some header values (muxrate, some flags, ...) so that they have the
  values specified by the standard
  - padding packs are inserted if the mux rate would be below 75 packs per
  second (the rate must not be below or above that value).
  - fixed the SCR of the packs
  - 20 zero bytes are now inserted at the end of each audio pack, after the
  data packet

Originally committed as revision 2804 to svn://svn.ffmpeg.org/ffmpeg/trunk

ffmpeg.c

@@ -3001,7 +3001,7 @@ static void opt_target(const char *arg)
 
         opt_video_codec("mpeg2video");
         opt_audio_codec("mp2");
-        opt_format("vcd");
+        opt_format("svcd");
 
         opt_frame_size(norm ? "480x480" : "480x576");
         opt_gop_size(norm ? "18" : "15");