[FFmpeg-cvslog] avcodec/nvenc: print minimum driver version on error

[Timo Rothenpieler]

ffmpeg | branch: master | Timo Rothenpieler <timo at rothenpieler.org> | Thu Jun  1 11:55:25 2017 +0200| [cb3358b68fa750a4e0361b46e17d2d8560bb5265] | committer: Timo Rothenpieler

avcodec/nvenc: print minimum driver version on error

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=cb3358b68fa750a4e0361b46e17d2d8560bb5265
---

 libavcodec/nvenc.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/libavcodec/nvenc.c b/libavcodec/nvenc.c
index d7420d7166..160e642614 100644
--- a/libavcodec/nvenc.c
+++ b/libavcodec/nvenc.c
@@ -112,6 +112,16 @@ static int nvenc_print_error(void *log_ctx, NVENCSTATUS err,
     return ret;
 }
 
+static void nvenc_print_driver_requirement(AVCodecContext *avctx, int level)
+{
+#if defined(_WIN32) || defined(__CYGWIN__)
+    const char *minver = "378.66";
+#else
+    const char *minver = "378.13";
+#endif
+    av_log(avctx, level, "The minimum required Nvidia driver for nvenc is %s or newer\n", minver);
+}
+
 static av_cold int nvenc_load_libraries(AVCodecContext *avctx)
 {
     NvencContext *ctx            = avctx->priv_data;
@@ -125,8 +135,10 @@ static av_cold int nvenc_load_libraries(AVCodecContext *avctx)
         return ret;
 
     ret = nvenc_load_functions(&dl_fn->nvenc_dl);
-    if (ret < 0)
+    if (ret < 0) {
+        nvenc_print_driver_requirement(avctx, AV_LOG_ERROR);
         return ret;
+    }
 
     err = dl_fn->nvenc_dl->NvEncodeAPIGetMaxSupportedVersion(&nvenc_max_ver);
     if (err != NV_ENC_SUCCESS)
@@ -139,6 +151,7 @@ static av_cold int nvenc_load_libraries(AVCodecContext *avctx)
                "Required: %d.%d Found: %d.%d\n",
                NVENCAPI_MAJOR_VERSION, NVENCAPI_MINOR_VERSION,
                nvenc_max_ver >> 4, nvenc_max_ver & 0xf);
+        nvenc_print_driver_requirement(avctx, AV_LOG_ERROR);
         return AVERROR(ENOSYS);
     }