Is mfxEncodeStatsContainer ready to be used?

[svutran]

Hi,

We have noticed that the mfxEncodeStatsContainer structure is available with OneVPL experimental mode.

At the moment, it seems that it returns nothing after the sync operation when passing the extended buffer to the bitstream before encode.

We are currently testing it on the hello-encode code.

Do you have any code example on how to retrieve the encode statistics (mfxEncodeStatsContainer) or is there any limitations on this feature?

Thanks you.

System Informations: 

Ubuntu 22.04

Linux kernel: 6.2.0-36-generic

OneVPL API version 2.8

Intel i7 11th generation

[ThasneemV_Intel]

Hi,

Thanks for posting in Intel Communities. As of now, we don't have any samples for mfxEncodeStatsContainer and we don't have any limitations for this feature. Please find more info here: https://spec.oneapi.io/onevpl/latest/API_ref/VPL_structs_encode.html#mfxencodestatscontainer

Could you please share the following details for triaging your issue further:

1) Sample reproducer code

2) Screenshot of the obtained output for reference.

Regards,

Thasneem Vazim

[svutran]

So, I am using the hello-encode.cpp provided in the examples folder of OneVPL.

First, I am trying to attach the EncodeStatsOutput structure to the bitstream

        mfxEncodeStatsContainer* poStatsContainer = new mfxEncodeStatsContainer();
        mfxExtEncodeStatsOutput* poEncodeStatsOutput = new mfxExtEncodeStatsOutput();
        poEncodeStatsOutput->Header.BufferId = MFX_EXTBUFF_ENCODESTATS;
        poEncodeStatsOutput->Header.BufferSz = sizeof(mfxExtEncodeStatsOutput);
        poEncodeStatsOutput->Mode = MFX_ENCODESTATS_MODE_DEFAULT;
        poEncodeStatsOutput->EncodeStatsContainer = poStatsContainer;

        bitstream.NumExtParam = 1;
        bitstream.ExtParam    = (mfxExtBuffer **)(&poEncodeStatsOutput);

        sts = MFXVideoENCODE_EncodeFrameAsync(session,
                                              NULL,
                                              (isDraining == true) ? NULL : encSurfaceIn,
                                              &bitstream,
                                              &syncp);

Then, I try to retrieve the stats after a successful sync operation

                    sts = MFXVideoCORE_SyncOperation(session, syncp, WAIT_100_MILLISECONDS);
                    VERIFY(MFX_ERR_NONE == sts, "MFXVideoCORE_SyncOperation error");

                    WriteEncodedStream(bitstream, sink);
                    framenum++;

                    // Extract statistics
                    mfxExtEncodeStatsOutput* poEncodeStatsOutput = (mfxExtEncodeStatsOutput*)(bitstream.ExtParam[0]);
                    {
                        // Do something with poEncodeStatsOutput
                    }

But when inspecting the values of poEncodeStatsOutput->EncodeStatsContainer, it is always empty. Below, is the content of the EncodeStatsOutput structure retrieved after the sync operation. We see that EncodeStatsContainer is empty.

Thank you for your time.

Stephan

[ThasneemV_Intel]

Hi,

We are checking on this internally. Meanwhile, could you please provide the modified hello-encode.cpp file and any other files that you have modified so that we can triage your issue further?

Regards,

Thasneem Vazim

[svutran]

Hi,

Here is the modified hello-encode.cpp.

Thank you

[ThasneemV_Intel]

Hi,

Thank you for sharing the details. We are checking on this internally.

Regards,

Thasneem vazim

[Pamela_H_Intel]

Stephan,

Experimental features are unsupported. For this particular feature we expect to add documentation and sample code, but cannot provide these yet, as experimental status means that the dev team may rework various aspects of the feature.

We do appreciate you asking though. Your question sparked some good conversation around experimental features and how we might easily be able to offer some pointers.

Pamela

[svutran]

Thank you for the update