added stream copy capability

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@1024 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

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