diff --git a/ffmpegdemo/ffmpeg/ffmpeg4/include64/libavutil/ffversion.h b/ffmpegdemo/ffmpeg/ffmpeg4/include64/libavutil/ffversion.h
index 4690884..7a1e981 100644
--- a/ffmpegdemo/ffmpeg/ffmpeg4/include64/libavutil/ffversion.h
+++ b/ffmpegdemo/ffmpeg/ffmpeg4/include64/libavutil/ffversion.h
@@ -1,5 +1,5 @@
 /* Automatically generated by version.sh, do not manually edit! */
 #ifndef AVUTIL_FFVERSION_H
 #define AVUTIL_FFVERSION_H
-#define FFMPEG_VERSION "4.2.1"
+#define FFMPEG_VERSION "4.2.3"
 #endif /* AVUTIL_FFVERSION_H */
diff --git a/ffmpegdemo/ffmpeg/ffmpeg4/include64/libavutil/lfg.h b/ffmpegdemo/ffmpeg/ffmpeg4/include64/libavutil/lfg.h
index 03f779a..2b66920 100644
--- a/ffmpegdemo/ffmpeg/ffmpeg4/include64/libavutil/lfg.h
+++ b/ffmpegdemo/ffmpeg/ffmpeg4/include64/libavutil/lfg.h
@@ -24,6 +24,12 @@
 
 #include <stdint.h>
 
+/**
+ * Context structure for the Lagged Fibonacci PRNG.
+ * The exact layout, types and content of this struct may change and should
+ * not be accessed directly. Only its sizeof() is guranteed to stay the same
+ * to allow easy instanciation.
+ */
 typedef struct AVLFG {
     unsigned int state[64];
     int index;
@@ -45,8 +51,9 @@ int av_lfg_init_from_data(AVLFG *c, const uint8_t *data, unsigned int length);
  * it may be good enough and faster for your specific use case.
  */
 static inline unsigned int av_lfg_get(AVLFG *c){
-    c->state[c->index & 63] = c->state[(c->index-24) & 63] + c->state[(c->index-55) & 63];
-    return c->state[c->index++ & 63];
+    unsigned a = c->state[c->index & 63] = c->state[(c->index-24) & 63] + c->state[(c->index-55) & 63];
+    c->index += 1U;
+    return a;
 }
 
 /**
@@ -57,7 +64,9 @@ static inline unsigned int av_lfg_get(AVLFG *c){
 static inline unsigned int av_mlfg_get(AVLFG *c){
     unsigned int a= c->state[(c->index-55) & 63];
     unsigned int b= c->state[(c->index-24) & 63];
-    return c->state[c->index++ & 63] = 2*a*b+a+b;
+    a = c->state[c->index & 63] = 2*a*b+a+b;
+    c->index += 1U;
+    return a;
 }
 
 /**
diff --git a/ffmpegdemo/ffmpeg/ffmpeg4/winlib64/avcodec.lib b/ffmpegdemo/ffmpeg/ffmpeg4/winlib64/avcodec.lib
index 29d0e73..983f2b8 100644
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diff --git a/ffmpegdemo/ffmpeg/ffmpeg4/winlib64/avdevice.lib b/ffmpegdemo/ffmpeg/ffmpeg4/winlib64/avdevice.lib
index 9e943f2..b5a7ece 100644
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diff --git a/ffmpegdemo/ffmpeg/ffmpeg4/winlib64/avfilter.lib b/ffmpegdemo/ffmpeg/ffmpeg4/winlib64/avfilter.lib
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diff --git a/ffmpegdemo/ffmpeg/ffmpeg4/winlib64/avformat.lib b/ffmpegdemo/ffmpeg/ffmpeg4/winlib64/avformat.lib
index a1116bc..71178a4 100644
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diff --git a/ffmpegdemo/ffmpeg/ffmpeg4/winlib64/avutil.lib b/ffmpegdemo/ffmpeg/ffmpeg4/winlib64/avutil.lib
index a0ec59f..dd741be 100644
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diff --git a/ffmpegdemo/ffmpeg/ffmpeg4/winlib64/postproc.lib b/ffmpegdemo/ffmpeg/ffmpeg4/winlib64/postproc.lib
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diff --git a/ffmpegdemo/ffmpeg/ffmpeg4/winlib64/swresample.lib b/ffmpegdemo/ffmpeg/ffmpeg4/winlib64/swresample.lib
index f25b3f1..4449252 100644
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diff --git a/ffmpegdemo/ffmpeg/ffmpeg4/winlib64/swscale.lib b/ffmpegdemo/ffmpeg/ffmpeg4/winlib64/swscale.lib
index 19bb8bb..d9cc8aa 100644
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