It is needed to have the calls to MFXJoinSession succeed.
---
libavutil/hwcontext_qsv.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/libavutil/hwcontext_qsv.c b/libavutil/hwcontext_qsv.c
index e0f6875b40..b7ed79cad4 100644
--- a/libavutil/hwcontext_qsv.c
+++ b/libavutil/hwcontext_qsv.c
@@ -1029,6 +1029,24 @@ static int
qsv_device_derive_from_child(AVHWDeviceContext *ctx,
goto fail;
}
+ err = MFXQueryVersion(hwctx->session, &ver);
+ if (err != MFX_ERR_NONE) {
+ av_log(ctx, AV_LOG_ERROR, "Error querying an MFX session: "
+ "%d.\n", err);
+ ret = AVERROR_UNKNOWN;
+ goto fail;
+ }
+
+ MFXClose(hwctx->session);
+
+ err = MFXInit(implementation, &ver, &hwctx->session);
+ if (err != MFX_ERR_NONE) {
+ av_log(ctx, AV_LOG_ERROR, "Error initializing an MFX session: "
+ "%d.\n", err);
+ ret = AVERROR_UNKNOWN;
+ goto fail;
+ }
+
err = MFXVideoCORE_SetHandle(hwctx->session, handle_type, handle);
if (err != MFX_ERR_NONE) {
av_log(ctx, AV_LOG_ERROR, "Error setting child device handle: "
--
2.11.1
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