From f65285aba0df7d46298abe0c945dfee05cbc6028 Mon Sep 17 00:00:00 2001
From: Anton Khirnov <anton@khirnov.net>
Date: Thu, 14 Jul 2016 12:13:53 +0200
Subject: [PATCH] lavc: set sw_pix_fmt for hwaccel encoding

---
 libavcodec/utils.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index bc1beee462..4184b95e63 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -1113,6 +1113,17 @@ FF_ENABLE_DEPRECATION_WARNINGS
                 ret = AVERROR(EINVAL);
                 goto free_and_end;
             }
+            if (avctx->sw_pix_fmt != AV_PIX_FMT_NONE &&
+                avctx->sw_pix_fmt != frames_ctx->sw_format) {
+                av_log(avctx, AV_LOG_ERROR,
+                       "Mismatching AVCodecContext.sw_pix_fmt (%s) "
+                       "and AVHWFramesContext.sw_format (%s)\n",
+                       av_get_pix_fmt_name(avctx->sw_pix_fmt),
+                       av_get_pix_fmt_name(frames_ctx->sw_format));
+                ret = AVERROR(EINVAL);
+                goto free_and_end;
+            }
+            avctx->sw_pix_fmt = frames_ctx->sw_format;
         }
     }