--- a/dlna/avdetector.cpp
+++ b/dlna/avdetector.cpp
@@ -262,7 +262,8 @@ int cAudioVideoDetector::detectDLNAProfi
 }
 
 AVCodecContext* cCodecToolKit::getFirstCodecContext(AVFormatContext* FormatCtx, CodecType Type){
-    return cCodecToolKit::getFirstStream(FormatCtx, Type)->codec;
+    AVStream* ret = cCodecToolKit::getFirstStream(FormatCtx, Type);
+    return ret ? ret->codec : NULL;
 }
 
 AVStream* cCodecToolKit::getFirstStream(AVFormatContext* FormatCtx, CodecType Type){
--- a/dlna/profiles/mpeg2.cpp
+++ b/dlna/profiles/mpeg2.cpp
@@ -159,6 +159,8 @@ VideoPortionProfile cMPEG2Profiler::prob
     AVCodecContext* VideoCodec = cCodecToolKit::getFirstCodecContext(FormatCtx, CODEC_TYPE_VIDEO);
     AVStream* VideoStream = cCodecToolKit::getFirstStream(FormatCtx, CODEC_TYPE_VIDEO);
 
+    if (VideoCodec == NULL || VideoStream == NULL)
+        return DLNA_VPP_UNKNOWN;
     MESSAGE(VERBOSE_METADATA, "Codec-ID:             %d", VideoCodec->codec_id);
     MESSAGE(VERBOSE_METADATA, "Codec-Name:           %s", VideoCodec->codec_name);
     MESSAGE(VERBOSE_METADATA, "Codec Bitrate:        %d", VideoCodec->bit_rate);