--- a/libavformat/aviobuf.c
+++ b/libavformat/aviobuf.c
@@ -33,7 +33,7 @@
 #include "url.h"
 #include <stdarg.h>
 
-#define IO_BUFFER_SIZE 32768
+#define IO_BUFFER_SIZE 262144
 
 /**
  * Do seeks within this distance ahead of the current buffer by skipping
@@ -556,15 +556,15 @@
     }
 
     /* make buffer smaller in case it ended up large after probing */
-    if (s->read_packet && s->orig_buffer_size && s->buffer_size > s->orig_buffer_size && len >= s->orig_buffer_size) {
+    if (s->read_packet && s->buffer_size > max_buffer_size) {
         if (dst == s->buffer && s->buf_ptr != dst) {
-            int ret = ffio_set_buf_size(s, s->orig_buffer_size);
+            int ret = ffio_set_buf_size(s, max_buffer_size);
             if (ret < 0)
                 av_log(s, AV_LOG_WARNING, "Failed to decrease buffer size\n");
 
             s->checksum_ptr = dst = s->buffer;
         }
-        len = s->orig_buffer_size;
+        len = max_buffer_size;
     }
 
     len = read_packet_wrapper(s, dst, len);