How to encoding a raw video to N streams using EXT LA BRC

[david123456]

Hi,

We want to encode a raw video (from capture card) to N streams using EXT LA BRC for web use.  Only see multi-transcode sample tell us how to transcode one stream to N streams. Could you give us a multi-encode sample?

[Jiandong_Z_Intel]

Hi There,

Currently, we have no multi-encode sample. You can base on MSDK sample_encode create your application.

If you want to test multi-encode, you can also start multiple sample_encode process for test.

Thanks,

Zachary

[Wei_F_]

I also came across to this problem. I was hope to put raw video data to the decoded surfaces, but found that in the original demo the decoded surfaces was empty, the data points are zero. So I wonder if I found the wrong place? Could you please tell me where did the multi-encode sample put the decoded data. Thank you.

[david123456]

Our application is one to N encode scenario. Sample_encode dosn't deal with ext_LA. Start multiple sample_encode may excute LA multiple times. It is low efficiency.

See Mediasdk-man.pdf page146 as follow:

Standalone LA by ENC class of functions is executed only once for input bitstream in contrast to the integrated LA where LA is executed for each of output streams. 

[david123456]

Hi Zachary，

Could you give me a sample_encode with ext_la BRC or tel me how to add ext_la BRC in sample_encode?

[Jiandong_Z_Intel]

Hi There,

sample_encode support Look Ahead MFX_RATECONTROL_LA  for H264, you can try following command line

#./sample_encode h264  -hw -i water.yuv -o water-la-out.h264 -w 720 -h 480 -la -lad 20
 

Thanks,

Zachary

[david123456]

Hi Zachary，

Yes,  sample_encode support Look Ahead MFX_RATECONTROL_LA.

But we want LA_EXT for 1:N scenario, not LA.

[david123456]

Hi intel,

Who can help me?

[Jiandong_Z_Intel]

Hi,

Merge some code from sample_multi_trancode to sample_encode, I think is mfxExtLAControl a key structure.

$ find -type f | xargs grep -e m_ExtLAControl -n
./samples/sample_multi_transcode/include/pipeline_transcode.h:510: mfxExtLAControl m_ExtLAControl;
./samples/sample_multi_transcode/src/pipeline_transcode.cpp:135: MSDK_ZERO_MEMORY(m_ExtLAControl);
./samples/sample_multi_transcode/src/pipeline_transcode.cpp:1840: mfxU16 num_resolutions = m_ExtLAControl.NumOutStream;
./samples/sample_multi_transcode/src/pipeline_transcode.cpp:1842: sizeof(mfxLAFrameInfo)*num_resolutions*m_ExtLAControl.LookAheadDepth;
./samples/sample_multi_transcode/src/pipeline_transcode.cpp:1860: pExtBuffer->NumAlloc = num_resolutions*m_ExtLAControl.LookAheadDepth;
./samples/sample_multi_transcode/src/pipeline_transcode.cpp:1921: MSDK_ZERO_MEMORY(m_ExtLAControl);
./samples/sample_multi_transcode/src/pipeline_transcode.cpp:1922: m_ExtLAControl.Header.BufferId = MFX_EXTBUFF_LOOKAHEAD_CTRL;
./samples/sample_multi_transcode/src/pipeline_transcode.cpp:1923: m_ExtLAControl.Header.BufferSz = sizeof(m_ExtLAControl);
./samples/sample_multi_transcode/src/pipeline_transcode.cpp:1924: m_ExtLAControl.LookAheadDepth = pInParams->nLADepth? pInParams->nLADepth : 40;
./samples/sample_multi_transcode/src/pipeline_transcode.cpp:1925: m_ExtLAControl.NumOutStream = 0;
./samples/sample_multi_transcode/src/pipeline_transcode.cpp:1926: m_ExtLAControl.BPyramid = (mfxU16)(pInParams->bEnableBPyramid ? MFX_CODINGOPTION_ON : MFX_CODINGOPTION_OFF);
./samples/sample_multi_transcode/src/pipeline_transcode.cpp:1940: m_PreEncExtParams.push_back((mfxExtBuffer *)&m_ExtLAControl);
./samples/sample_multi_transcode/src/pipeline_transcode.cpp:1954: mfxU32 num = m_ExtLAControl.NumOutStream;
./samples/sample_multi_transcode/src/pipeline_transcode.cpp:1958: if (m_ExtLAControl.OutStream.Width == width && m_ExtLAControl.OutStream.Height == height)
./samples/sample_multi_transcode/src/pipeline_transcode.cpp:1961: MSDK_CHECK_RESULT((sizeof(m_ExtLAControl.OutStream) / sizeof(m_ExtLAControl.OutStream[0])),num + 1 , MFX_ERR_UNSUPPORTED);
./samples/sample_multi_transcode/src/pipeline_transcode.cpp:1962: m_ExtLAControl.OutStream[num].Width = width;
./samples/sample_multi_transcode/src/pipeline_transcode.cpp:1963: m_ExtLAControl.OutStream[num].Height = height;
./samples/sample_multi_transcode/src/pipeline_transcode.cpp:1964: m_ExtLAControl.NumOutStream = (mfxU16)num + 1;

hope it helpful.

Thanks,

Zachary