lavc: add support for interleaved chroma formats to libx264.

Interleaved chroma is x264's native format
Signed-off-by: Anton Khirnov <anton@khirnov.net>

libavcodec/libx264.c

@@ -225,6 +225,9 @@ static int convert_pix_fmt(enum AVPixelFormat pix_fmt)
     case AV_PIX_FMT_YUV444P:
     case AV_PIX_FMT_YUV444P9:
     case AV_PIX_FMT_YUV444P10: return X264_CSP_I444;
+    case AV_PIX_FMT_NV12:      return X264_CSP_NV12;
+    case AV_PIX_FMT_NV16:
+    case AV_PIX_FMT_NV20:      return X264_CSP_NV16;
     };
     return 0;
 }
@@ -480,6 +483,8 @@ static const enum AVPixelFormat pix_fmts_8bit[] = {
     AV_PIX_FMT_YUVJ420P,
     AV_PIX_FMT_YUV422P,
     AV_PIX_FMT_YUV444P,
+    AV_PIX_FMT_NV12,
+    AV_PIX_FMT_NV16,
     AV_PIX_FMT_NONE
 };
 static const enum AVPixelFormat pix_fmts_9bit[] = {
@@ -491,6 +496,7 @@ static const enum AVPixelFormat pix_fmts_10bit[] = {
     AV_PIX_FMT_YUV420P10,
     AV_PIX_FMT_YUV422P10,
     AV_PIX_FMT_YUV444P10,
+    AV_PIX_FMT_NV20,
     AV_PIX_FMT_NONE
 };