diff --git a/configure b/configure
index 5d1ba2b006..355cab1cc3 100755
--- a/configure
+++ b/configure
@@ -2618,8 +2618,8 @@ enabled libspeex   && require  libspeex speex/speex.h speex_decoder_init -lspeex
 enabled libtheora  && require  libtheora theora/theoraenc.h th_info_init -ltheoraenc -ltheoradec -logg
 enabled libvorbis  && require  libvorbis vorbis/vorbisenc.h vorbis_info_init -lvorbisenc -lvorbis -logg
 enabled libx264    && require  libx264 x264.h x264_encoder_encode -lx264 -lm &&
-                      { check_cpp_condition x264.h "X264_BUILD >= 83" ||
-                        die "ERROR: libx264 version must be >= 0.83."; }
+                      { check_cpp_condition x264.h "X264_BUILD >= 90" ||
+                        die "ERROR: libx264 version must be >= 0.90."; }
 enabled libxvid    && require  libxvid xvid.h xvid_global -lxvidcore
 enabled mlib       && require  mediaLib mlib_types.h mlib_VectorSub_S16_U8_Mod -lmlib
 
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index b6437473e6..be9994f7b2 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -30,7 +30,7 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVCODEC_VERSION_MAJOR 52
-#define LIBAVCODEC_VERSION_MINOR 66
+#define LIBAVCODEC_VERSION_MINOR 67
 #define LIBAVCODEC_VERSION_MICRO  0
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
@@ -597,6 +597,7 @@ typedef struct RcOverride{
 #define CODEC_FLAG2_MBTREE        0x00040000 ///< Use macroblock tree ratecontrol (x264 only)
 #define CODEC_FLAG2_PSY           0x00080000 ///< Use psycho visual optimizations.
 #define CODEC_FLAG2_SSIM          0x00100000 ///< Compute SSIM during encoding, error[] values are undefined.
+#define CODEC_FLAG2_INTRA_REFRESH 0x00200000 ///< Use periodic insertion of intra blocks instead of keyframes.
 
 /* Unsupported options :
  *              Syntax Arithmetic coding (SAC)
@@ -2646,6 +2647,15 @@ typedef struct AVCodecContext {
      * - decoding: unused
      */
     int rc_lookahead;
+
+    /**
+     * Constant rate factor maximum
+     * With CRF encoding mode and VBV restrictions enabled, prevents quality from being worse
+     * than crf_max, even if doing so would violate VBV restrictions.
+     * - encoding: Set by user.
+     * - decoding: unused
+     */
+    float crf_max;
 } AVCodecContext;
 
 /**
diff --git a/libavcodec/libx264.c b/libavcodec/libx264.c
index df7b2e806b..ec6d5ea433 100644
--- a/libavcodec/libx264.c
+++ b/libavcodec/libx264.c
@@ -156,6 +156,7 @@ static av_cold int X264_init(AVCodecContext *avctx)
     x4->params.p_log_private        = avctx;
 
     x4->params.i_keyint_max         = avctx->gop_size;
+    x4->params.b_intra_refresh      = avctx->flags2 & CODEC_FLAG2_INTRA_REFRESH;
     x4->params.rc.i_bitrate         = avctx->bit_rate       / 1000;
     x4->params.rc.i_vbv_buffer_size = avctx->rc_buffer_size / 1000;
     x4->params.rc.i_vbv_max_bitrate = avctx->rc_max_rate    / 1000;
@@ -166,6 +167,7 @@ static av_cold int X264_init(AVCodecContext *avctx)
         if (avctx->crf) {
             x4->params.rc.i_rc_method   = X264_RC_CRF;
             x4->params.rc.f_rf_constant = avctx->crf;
+            x4->params.rc.f_rf_constant_max = avctx->crf_max;
         } else if (avctx->cqp > -1) {
             x4->params.rc.i_rc_method   = X264_RC_CQP;
             x4->params.rc.i_qp_constant = avctx->cqp;
diff --git a/libavcodec/options.c b/libavcodec/options.c
index 6835352c30..3b50d2c689 100644
--- a/libavcodec/options.c
+++ b/libavcodec/options.c
@@ -411,6 +411,8 @@ static const AVOption options[]={
 {"aq_strength", "specify aq strength", OFFSET(aq_strength), FF_OPT_TYPE_FLOAT, 1.0, 0, FLT_MAX, V|E},
 {"rc_lookahead", "specify number of frames to look ahead for frametype", OFFSET(rc_lookahead), FF_OPT_TYPE_INT, 40, 0, INT_MAX, V|E},
 {"ssim", "ssim will be calculated during encoding", 0, FF_OPT_TYPE_CONST, CODEC_FLAG2_SSIM, INT_MIN, INT_MAX, V|E, "flags2"},
+{"intra_refresh", "use periodic insertion of intra blocks instead of keyframes", 0, FF_OPT_TYPE_CONST, CODEC_FLAG2_INTRA_REFRESH, INT_MIN, INT_MAX, V|E, "flags2"},
+{"crf_max", "in crf mode, prevents vbv from lowering quality beyond this point", OFFSET(crf_max), FF_OPT_TYPE_FLOAT, DEFAULT, 0, 51, V|E},
 {NULL},
 };