diff --git a/media/ffvpx/README_MCP b/media/ffvpx/README_MCP
index 4555e08da..5ed4d8d94 100644
--- a/media/ffvpx/README_MCP
+++ b/media/ffvpx/README_MCP
@@ -7,10 +7,6 @@ Currently, we only use the vp8 and vp9 portion of the library, and only on x86
 based platforms. If this changes, configuration files will most likely
 need to be updated.
 
-AVX2 must be disabled on Linux 32 bits due to the use of yasm 1.1 on the build bots.
-Once yasm is upgraded to 1.2 or later, AVX2 code could be re-enabled.
-Add --disable-avx2 to configure on those platforms.
-
 configuration files were generated as follow using the configure script:
 ./configure --disable-everything --disable-protocols --disable-demuxers --disable-muxers --disable-filters --disable-programs --disable-doc --disable-parsers --enable-parser=vp8 --enable-parser=vp9 --enable-decoder=vp8 --enable-decoder=vp9 --disable-static --enable-shared --disable-debug --disable-sdl2 --disable-libxcb --disable-securetransport --disable-iconv --disable-swresample --disable-swscale --disable-avdevice --disable-avfilter --disable-avformat --disable-d3d11va --disable-dxva2 --disable-vaapi --disable-vda --disable-vdpau --disable-videotoolbox --enable-decoder=flac --enable-asm --enable-x86asm
 
@@ -18,13 +14,12 @@ config*:
 replace: /HAVE_(MALLOC_H|ARC4RANDOM|LOCALTIME_R|MEMALIGN|POSIX_MEMALIGN)/d
 
 config_darwin32.h:
-add to configure command: --disable-asm --disable-yasm --cc='clang -m32'
+add to configure command: --disable-asm --disable-x86asm --cc='clang -m32'
 
 config_unix32.h:
 add to configure command: --disable-asm --disable-x86asm --cc='clang -m32'
 replace: s/HAVE_SYSCTL 1/HAVE_SYSCTL 0/ and s/HAVE_MEMALIGN 1/HAVE_MEMALIGN 0/ and s/HAVE_POSIX_MEMALIGN 1/HAVE_POSIX_MEMALIGN 0/
 
-
 config_unix32.h/config_unix64.h/config_unix64.asm:
 replace: s/HAVE_SYSCTL 1/HAVE_SYSCTL 0
 
diff --git a/media/ffvpx/libavcodec/aacpsdsp_template.c b/media/ffvpx/libavcodec/aacpsdsp_template.c
index 65867649c..5f4be017d 100644
--- a/media/ffvpx/libavcodec/aacpsdsp_template.c
+++ b/media/ffvpx/libavcodec/aacpsdsp_template.c
@@ -150,10 +150,10 @@ static void ps_stereo_interpolate_c(INTFLOAT (*l)[2], INTFLOAT (*r)[2],
     INTFLOAT h1 = h[0][1];
     INTFLOAT h2 = h[0][2];
     INTFLOAT h3 = h[0][3];
-    INTFLOAT hs0 = h_step[0][0];
-    INTFLOAT hs1 = h_step[0][1];
-    INTFLOAT hs2 = h_step[0][2];
-    INTFLOAT hs3 = h_step[0][3];
+    UINTFLOAT hs0 = h_step[0][0];
+    UINTFLOAT hs1 = h_step[0][1];
+    UINTFLOAT hs2 = h_step[0][2];
+    UINTFLOAT hs3 = h_step[0][3];
     int n;
 
     for (n = 0; n < len; n++) {
diff --git a/media/ffvpx/libavcodec/h264_cavlc.c b/media/ffvpx/libavcodec/h264_cavlc.c
index 5e6a20304..d82144e3c 100644
--- a/media/ffvpx/libavcodec/h264_cavlc.c
+++ b/media/ffvpx/libavcodec/h264_cavlc.c
@@ -714,8 +714,14 @@ int ff_h264_decode_mb_cavlc(const H264Context *h, H264SliceContext *sl)
     cbp = 0; /* avoid warning. FIXME: find a solution without slowing
                 down the code */
     if (sl->slice_type_nos != AV_PICTURE_TYPE_I) {
-        if (sl->mb_skip_run == -1)
-            sl->mb_skip_run = get_ue_golomb_long(&sl->gb);
+        if (sl->mb_skip_run == -1) {
+            unsigned mb_skip_run = get_ue_golomb_long(&sl->gb);
+            if (mb_skip_run > h->mb_num) {
+                av_log(h->avctx, AV_LOG_ERROR, "mb_skip_run %d is invalid\n", mb_skip_run);
+                return AVERROR_INVALIDDATA;
+            }
+            sl->mb_skip_run = mb_skip_run;
+        }
 
         if (sl->mb_skip_run--) {
             if (FRAME_MBAFF(h) && (sl->mb_y & 1) == 0) {
diff --git a/media/ffvpx/libavcodec/h264_refs.c b/media/ffvpx/libavcodec/h264_refs.c
index af7082959..2cdb67f97 100644
--- a/media/ffvpx/libavcodec/h264_refs.c
+++ b/media/ffvpx/libavcodec/h264_refs.c
@@ -806,6 +806,7 @@ int ff_h264_execute_ref_pic_marking(H264Context *h)
         }
     }
 
+    // Detect unmarked random access points
     if (   err >= 0
         && h->long_ref_count==0
         && (   h->short_ref_count<=2
diff --git a/media/ffvpx/libavcodec/mpegaudio_parser.c b/media/ffvpx/libavcodec/mpegaudio_parser.c
index 8c3982579..a072851ec 100644
--- a/media/ffvpx/libavcodec/mpegaudio_parser.c
+++ b/media/ffvpx/libavcodec/mpegaudio_parser.c
@@ -98,6 +98,8 @@ static int mpegaudio_parse(AVCodecParserContext *s1,
                     } else if (codec_id == AV_CODEC_ID_MP3ADU) {
                         avpriv_report_missing_feature(avctx,
                             "MP3ADU full parser");
+                        *poutbuf = NULL;
+                        *poutbuf_size = 0;
                         return 0; /* parsers must not return error codes */
                     }
 
diff --git a/media/ffvpx/libavcodec/unary.h b/media/ffvpx/libavcodec/unary.h
index 908dc9350..d57f9f70c 100644
--- a/media/ffvpx/libavcodec/unary.h
+++ b/media/ffvpx/libavcodec/unary.h
@@ -28,7 +28,20 @@
  * @param gb GetBitContext
  * @param[in] stop The bitstop value (unary code of 1's or 0's)
  * @param[in] len Maximum length
- * @return Unary length/index
+ * @return unary 0 based code index. This is also the length in bits of the
+ * code excluding the stop bit.
+ * (in case len=1)
+ * 1            0
+ * 0            1
+ * (in case len=2)
+ * 1            0
+ * 01           1
+ * 00           2
+ * (in case len=3)
+ * 1            0
+ * 01           1
+ * 001          2
+ * 000          3
  */
 static inline int get_unary(GetBitContext *gb, int stop, int len)
 {
diff --git a/media/ffvpx/libavutil/common.h b/media/ffvpx/libavutil/common.h
index 8142b31fd..58ead8051 100644
--- a/media/ffvpx/libavutil/common.h
+++ b/media/ffvpx/libavutil/common.h
@@ -158,7 +158,7 @@ static av_always_inline av_const int64_t av_clip64_c(int64_t a, int64_t amin, in
  */
 static av_always_inline av_const uint8_t av_clip_uint8_c(int a)
 {
-    if (a&(~0xFF)) return (-a)>>31;
+    if (a&(~0xFF)) return (~a)>>31;
     else           return a;
 }
 
@@ -180,7 +180,7 @@ static av_always_inline av_const int8_t av_clip_int8_c(int a)
  */
 static av_always_inline av_const uint16_t av_clip_uint16_c(int a)
 {
-    if (a&(~0xFFFF)) return (-a)>>31;
+    if (a&(~0xFFFF)) return (~a)>>31;
     else             return a;
 }
 
@@ -228,7 +228,7 @@ static av_always_inline av_const int av_clip_intp2_c(int a, int p)
  */
 static av_always_inline av_const unsigned av_clip_uintp2_c(int a, int p)
 {
-    if (a & ~((1<<p) - 1)) return -a >> 31 & ((1<<p) - 1);
+    if (a & ~((1<<p) - 1)) return (~a) >> 31 & ((1<<p) - 1);
     else                   return  a;
 }
 
diff --git a/media/ffvpx/libavutil/integer.c b/media/ffvpx/libavutil/integer.c
index 6d6855fa1..ba4aa778c 100644
--- a/media/ffvpx/libavutil/integer.c
+++ b/media/ffvpx/libavutil/integer.c
@@ -74,7 +74,7 @@ AVInteger av_mul_i(AVInteger a, AVInteger b){
 
         if(a.v[i])
             for(j=i; j<AV_INTEGER_SIZE && j-i<=nb; j++){
-                carry= (carry>>16) + out.v[j] + a.v[i]*b.v[j-i];
+                carry= (carry>>16) + out.v[j] + a.v[i]*(unsigned)b.v[j-i];
                 out.v[j]= carry;
             }
     }
diff --git a/media/ffvpx/libavutil/pixfmt.h b/media/ffvpx/libavutil/pixfmt.h
index 24889c8e5..8a26fa874 100644
--- a/media/ffvpx/libavutil/pixfmt.h
+++ b/media/ffvpx/libavutil/pixfmt.h
@@ -42,6 +42,10 @@
  * This is stored as BGRA on little-endian CPU architectures and ARGB on
  * big-endian CPUs.
  *
+ * @note
+ * If the resolution is not a multiple of the chroma subsampling factor
+ * then the chroma plane resolution must be rounded up.
+ *
  * @par
  * When the pixel format is palettized RGB32 (AV_PIX_FMT_PAL8), the palettized
  * image data is stored in AVFrame.data[0]. The palette is transported in