topic Re: H264 Video Encoder Ignores Profile Selection in Intel® Integrated Performance Primitives

H264 Video Encoder Ignores Profile Selection

motola212 — Thu, 06 Aug 2009 07:46:30 GMT

Hey,

I'm trying to instantiate the h264 IPP video encoder with the following paramters:

Width = 800
Height = 600
FPS = 30
I frame interval = 2
P frame interval = 1
B frame interval = 0
Bitrate = 10Mbps
Profile = Main
Level IDC = 3.1

But the encoder always uses "High Profile".
Our indication is from the SPS and PPS and from the binary compressed frame (Profile = 0x64).
Why is this?

motola

Re: H264 Video Encoder Ignores Profile Selection

Ying_H_Intel — Mon, 10 Aug 2009 09:31:50 GMT

Quoting - motola212

Hello Motola,

You may try to use the H264.par file as encoder's parameter.

at line 7

100 0 /* profile_idc (77-main, 100-high); level_idc (set 0 for automatic select

Please change the 100 to 77.

Here isone KB for your reference: Setting H.264 encoding parameters in Intel IPP media processing samples

Best Regards,
Ying

Re: H264 Video Encoder Ignores Profile Selection

motola212 — Wed, 12 Aug 2009 06:26:51 GMT

Hello Ying,

I'm changing the parameters by code through "UMC::H264EncoderParams" but still no change.
Is this possible that the encoder changes the parameters according to the other parameters (frame sizebitrate...)?

Thanks,
Motola

Re: H264 Video Encoder Ignores Profile Selection

Ying_H_Intel — Wed, 12 Aug 2009 08:09:44 GMT

Hello Motala,

The H.264 encoderparamenter take"Highprofile" by default (and corresponding defaultparameter as H264.par). If youset the parameters bycode,you may need changeother default parameters with the profile_idc together.
For example, try
Params.profile_idc= UMC::H264_MAIN_PROFILE;
Params.transform_8x8_mode_flag=0;

All my Best,
Ying