diff --git a/python/build/libs.py b/python/build/libs.py
index 7f757d93c..7db98bed4 100644
--- a/python/build/libs.py
+++ b/python/build/libs.py
@@ -58,8 +58,8 @@ libmad = AutotoolsProject(
 )
 
 ffmpeg = FfmpegProject(
-    'http://ffmpeg.org/releases/ffmpeg-3.2.4.tar.xz',
-    '6e38ff14f080c98b58cf5967573501b8cb586e3a173b591f3807d8f0660daf7a',
+    'http://ffmpeg.org/releases/ffmpeg-3.3.tar.xz',
+    '599e7f7c017221c22011c4037b88bdcd1c47cd40c1e466838bc3c465f3e9569d',
     'lib/libavcodec.a',
     [
         '--disable-shared', '--enable-static',
@@ -82,8 +82,8 @@ ffmpeg = FfmpegProject(
 )
 
 curl = AutotoolsProject(
-    'http://curl.haxx.se/download/curl-7.52.1.tar.lzma',
-    '44286d4b825936e2430fc44ad730ce899afb736a5d328cbb8b5d42462f3f2365',
+    'http://curl.haxx.se/download/curl-7.54.0.tar.lzma',
+    'cd6aa6039f13e0b06e0a93e1b93754f6dc07f444812bb6c32be75a8f28c4070a',
     'lib/libcurl.a',
     [
         '--disable-shared', '--enable-static',
@@ -103,7 +103,7 @@ curl = AutotoolsProject(
 )
 
 boost = BoostProject(
-    'http://downloads.sourceforge.net/project/boost/boost/1.63.0/boost_1_63_0.tar.bz2',
-    'beae2529f759f6b3bf3f4969a19c2e9d6f0c503edcb2de4a61d1428519fcb3b0',
+    'http://downloads.sourceforge.net/project/boost/boost/1.64.0/boost_1_64_0.tar.bz2',
+    '7bcc5caace97baa948931d712ea5f37038dbb1c5d89b43ad4def4ed7cb683332',
     'include/boost/version.hpp',
 )
diff --git a/src/decoder/plugins/PcmDecoderPlugin.cxx b/src/decoder/plugins/PcmDecoderPlugin.cxx
index de9390c97..421fc3a81 100644
--- a/src/decoder/plugins/PcmDecoderPlugin.cxx
+++ b/src/decoder/plugins/PcmDecoderPlugin.cxx
@@ -81,7 +81,7 @@ pcm_stream_decode(DecoderClient &client, InputStream &is)
 	if (is_float)
 		audio_format.format = SampleFormat::FLOAT;
 
-	{
+	if (mime != nullptr) {
 		const auto mime_parameters = ParseMimeTypeParameters(mime);
 
 		/* MIME type parameters according to RFC 2586 */