ffmpeg: replace MAX_STREAMS by an arbitrary sanity check

Originally committed as revision 25304 to svn://svn.ffmpeg.org/ffmpeg/trunk

ffmpeg.c

@@ -103,6 +103,9 @@ typedef struct AVMetaDataMap {
 static const OptionDef options[];
 
 #define MAX_FILES 100
+#if !FF_API_MAX_STREAMS
+#define MAX_STREAMS 1024    /* arbitrary sanity check value */
+#endif
 
 static const char *last_asked_format = NULL;
 static AVFormatContext *input_files[MAX_FILES];