added stream copy capability

Originally committed as revision 1024 to svn://svn.ffmpeg.org/ffmpeg/trunk

libav/avformat.h

@@ -129,6 +129,8 @@ typedef struct AVStream {
     int codec_info_state;     
     int codec_info_nb_repeat_frames;
     int codec_info_nb_real_frames;
+    /* ffmpeg.c private use */
+    int stream_copy; /* if TRUE, just copy stream */
 } AVStream;
 
 #define MAX_STREAMS 20