How to set temporal layer bitrate with CBR mode & AMFVideoEncoderVCE_SVC encoder?

[jieytan]

Hi.

Say i want to set 2 layers. The total bitrate is 3M. And ratio T0:T1 is 6:4.

Since there is no detailed document. I tested on the sample code. (I config TranscodeHW to get h264 file, and use SVCSplitter to analyse the file.)

Here are some the questions:

1. Firstly, I found if i want total bitrate to be 3M, i will have to set "TL0.QL0.TargetBitrate"+"TL1.QL0.TargetBitrate" to be 6M, which is layers * target bitrate.
   Is this conclusion right?

2. Secondly. since the tests data(↓) shows no pattern, I still don't know how to get the right T0:T1 ratio. Please help me out.

(Here are the data:

m_pEncoder->SetProperty(L"TL0.QL0.TargetBitrate", 5000000);
m_pEncoder->SetProperty(L"TL1.QL0.TargetBitrate", 1000000);
output:
T0:T1=17 : 1

m_pEncoder->SetProperty(L"TL0.QL0.TargetBitrate", 4000000);
m_pEncoder->SetProperty(L"TL1.QL0.TargetBitrate", 2000000);
output:
T0:T1=3.3

m_pEncoder->SetProperty(L"TL1.QL0.TargetBitrate", 3000000);
m_pEncoder->SetProperty(L"TL0.QL0.TargetBitrate", 3000000);
output:
T0:T1=1.5

m_pEncoder->SetProperty(L"TL0.QL0.TargetBitrate", 2000000);
m_pEncoder->SetProperty(L"TL1.QL0.TargetBitrate", 4000000);
output:
T0:T1=0.72

m_pEncoder->SetProperty(L"TL0.QL0.TargetBitrate", 1000000);
m_pEncoder->SetProperty(L"TL1.QL0.TargetBitrate", 5000000);
output:
T0:T1=0.29)