diff --git a/packager/media/base/demuxer.cc b/packager/media/base/demuxer.cc
index e9ce0ce3de..38b404ab11 100644
--- a/packager/media/base/demuxer.cc
+++ b/packager/media/base/demuxer.cc
@@ -23,7 +23,7 @@
 namespace {
 const size_t kInitBufSize = 0x4000;  // 16KB, sufficient to determine the
                                      // container and likely all init data.
-const size_t kBufSize = 0x40000;  // 256KB.
+const size_t kBufSize = 0x200000;  // 2MB
 }
 
 namespace edash_packager {
diff --git a/packager/media/formats/mp4/single_segment_segmenter.cc b/packager/media/formats/mp4/single_segment_segmenter.cc
index a0bc6bba82..635d538be7 100644
--- a/packager/media/formats/mp4/single_segment_segmenter.cc
+++ b/packager/media/formats/mp4/single_segment_segmenter.cc
@@ -107,7 +107,7 @@ Status SingleSegmentSegmenter::DoFinalize() {
                   "Cannot open file to read " + temp_file_name_);
   }
 
-  const int kBufSize = 0x40000;  // 256KB.
+  const int kBufSize = 0x200000;  // 2MB.
   scoped_ptr<uint8_t[]> buf(new uint8_t[kBufSize]);
   while (!temp_file->Eof()) {
     int64_t size = temp_file->Read(buf.get(), kBufSize);