It is benefit to diagnose issues related to different libmfx version.

Signed-off-by: Zhong Li <zhong...@intel.com>
---
 libavutil/hwcontext_qsv.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavutil/hwcontext_qsv.c b/libavutil/hwcontext_qsv.c
index 5018a05..9270b22 100644
--- a/libavutil/hwcontext_qsv.c
+++ b/libavutil/hwcontext_qsv.c
@@ -1036,6 +1036,10 @@ static int 
qsv_device_derive_from_child(AVHWDeviceContext *ctx,
         goto fail;
     }
 
+    av_log(ctx, AV_LOG_VERBOSE,
+           "Initialize MFX session: API version is %d.%d, implementation 
version is %d.%d\n",
+           MFX_VERSION_MAJOR, MFX_VERSION_MINOR, ver.Major, ver.Minor);
+
     MFXClose(hwctx->session);
 
     err = MFXInit(implementation, &ver, &hwctx->session);
-- 
1.8.3.1

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