Backported from ffmpeg commit c6558e8840fbb2386bf8742e4d68dd6e067d262e
Author: Luca Barbato <lu_zero@gentoo.org>
Date:   Tue Dec 26 12:32:42 2017 +0100

    x264: Support version 153
    
    It has native simultaneus 8 and 10 bit support.

--- mythtv/external/FFmpeg/libavcodec/libx264.c.orig	2018-02-01 04:00:06.000000000 -0800
+++ mythtv/external/FFmpeg/libavcodec/libx264.c	2019-03-17 01:17:29.000000000 -0700
@@ -268,7 +268,11 @@
 
     x264_picture_init( &x4->pic );
     x4->pic.img.i_csp   = x4->params.i_csp;
+#if X264_BUILD >= 153
+    if (x4->params.i_bitdepth > 8)
+#else
     if (x264_bit_depth > 8)
+#endif
         x4->pic.img.i_csp |= X264_CSP_HIGH_DEPTH;
     x4->pic.img.i_plane = avfmt2_num_planes(ctx->pix_fmt);
 
@@ -496,6 +500,9 @@
     x4->params.p_log_private        = avctx;
     x4->params.i_log_level          = X264_LOG_DEBUG;
     x4->params.i_csp                = convert_pix_fmt(avctx->pix_fmt);
+#if X264_BUILD >= 153
+    x4->params.i_bitdepth           = av_pix_fmt_desc_get(avctx->pix_fmt)->comp[0].depth;
+#endif
 
     PARSE_X264_OPT("weightp", wpredp);
 
@@ -858,6 +865,7 @@
     return 0;
 }
 
+#if X264_BUILD < 153
 static const enum AVPixelFormat pix_fmts_8bit[] = {
     AV_PIX_FMT_YUV420P,
     AV_PIX_FMT_YUVJ420P,
@@ -892,15 +900,45 @@
 #endif
     AV_PIX_FMT_NONE
 };
+#else
+static const enum AVPixelFormat pix_fmts_all[] = {
+    AV_PIX_FMT_YUV420P,
+    AV_PIX_FMT_YUVJ420P,
+    AV_PIX_FMT_YUV422P,
+    AV_PIX_FMT_YUVJ422P,
+    AV_PIX_FMT_YUV444P,
+    AV_PIX_FMT_YUVJ444P,
+    AV_PIX_FMT_NV12,
+    AV_PIX_FMT_NV16,
+    AV_PIX_FMT_NV21,
+    AV_PIX_FMT_YUV420P10,
+    AV_PIX_FMT_YUV422P10,
+    AV_PIX_FMT_YUV444P10,
+    AV_PIX_FMT_NV20,
+    AV_PIX_FMT_NONE
+};
+#endif
+#if CONFIG_LIBX264RGB_ENCODER
+static const enum AVPixelFormat pix_fmts_8bit_rgb[] = {
+    AV_PIX_FMT_BGR0,
+    AV_PIX_FMT_BGR24,
+    AV_PIX_FMT_RGB24,
+    AV_PIX_FMT_NONE
+};
+#endif
 
 static av_cold void X264_init_static(AVCodec *codec)
 {
+#if X264_BUILD < 153
     if (x264_bit_depth == 8)
         codec->pix_fmts = pix_fmts_8bit;
     else if (x264_bit_depth == 9)
         codec->pix_fmts = pix_fmts_9bit;
     else if (x264_bit_depth == 10)
         codec->pix_fmts = pix_fmts_10bit;
+#else
+    codec->pix_fmts = pix_fmts_all;
+#endif
 }
 
 #define OFFSET(x) offsetof(X264Context, x)
@@ -1035,13 +1073,6 @@
     .version    = LIBAVUTIL_VERSION_INT,
 };
 
-static const AVClass rgbclass = {
-    .class_name = "libx264rgb",
-    .item_name  = av_default_item_name,
-    .option     = options,
-    .version    = LIBAVUTIL_VERSION_INT,
-};
-
 AVCodec ff_libx264_encoder = {
     .name             = "libx264",
     .long_name        = NULL_IF_CONFIG_SMALL("libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10"),
@@ -1058,6 +1089,15 @@
     .caps_internal    = FF_CODEC_CAP_INIT_THREADSAFE |
                         FF_CODEC_CAP_INIT_CLEANUP,
 };
+#endif
+
+#if CONFIG_LIBX264RGB_ENCODER
+static const AVClass rgbclass = {
+    .class_name = "libx264rgb",
+    .item_name  = av_default_item_name,
+    .option     = options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
 
 AVCodec ff_libx264rgb_encoder = {
     .name           = "libx264rgb",