Avoid creating tiny (possibly only 64 bytes large) audio packets resulting in

huge processing and memory usage overhead for avi files with raw PCM audio.

Originally committed as revision 22521 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/avidec.c

@@ -749,7 +749,8 @@ resync:
         if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
             size= INT_MAX;
         else if(ast->sample_size < 32)
-            size= 64*ast->sample_size;
+            // arbitrary multiplier to avoid tiny packets for raw PCM data
+            size= 1024*ast->sample_size;
         else
             size= ast->sample_size;