How to set dm8168 omx encoder parameters for supportting multiple slices per picture?

Hi Tory,

As I told earlier, if you don't have overlay package you can't modify encoder parameter in omx for slice encoding.

Check if you have omx_h264ve.c in component-sources\omx-ti81xx-src_05_02_00_48\src\ti\omx\comp\venc\src of your ezsdk package.

If you find this file, you need to modify the function OMX_TI_H264VE_SetDefaultDynamicParams() to set the sliceCodingParams stucture.

Ram

Hi ram,

 " The encoder in EZSDK does support slices - it just doesn't support the ability to extract the slices separately as they are encoded." Is it right?

So i set the encoder parameters as following.But encoder does not output slices.It does not work.Can you give me some advice?

Thank you very much.

OMX_VIDEO_PARAM_DYNAMICPARAMS dynamic_params;

OMX_INIT_PARAM(&dynamic_params);
dynamic_params.nPortIndex = OMX_VIDENC_OUTPUT_PORT;

OMX_GetParameter(encoder_handle, OMX_TI_IndexParamVideoDynamicParams, &dynamic_params);

IH264ENC_DynamicParams *h264_params = &dynamic_params.videoDynamicParams.h264EncDynamicParams;

h264_params->sliceCodingParams.sliceCodingPreset = IH264_SLICECODING_USERDEFINED;
h264_params->sliceCodingParams.sliceMode         = IH264_SLICEMODE_BYTES;
h264_params->sliceCodingParams.sliceUnitSize     = 1300;
h264_params->sliceCodingParams.streamFormat      = IH264_BYTE_STREAM;

OMX_SetParameter(encoder_handle, OMX_TI_IndexParamVideoDynamicParams, &dynamic_params);


tory

Hi Tory,

Yes the statement is correct.

When you get one buffer from encoder component through FillBufferDone, the buffer will have all slices in a single buffer which constitute a frame. 

From the other thread, 

http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/717/t/278942.aspx, I guess you are able to set encoder to encode in slices in iLClient .

How did you verify output has once slice? Did you use any video analyzer?

Ram

Hi Ram,

  I save the single buffer to a file.Then check the file by ue software.The first frame nal seq is sps pps i frame data.But I frame data is only one nal.So i think it is only one slice not mul slices.Any parameters need to be set?

Thank you very much.

tory

Hi Tory,

Are you setting sliceCoding params in iLClient_utils.c of omx_05_02_00_48\examples\ti\omx\demos\encode\src ?

If this is yes, your settings is not interpreted since eEncodingModePreset is set to OMX_Video_Enc_Default.

Set eEncodingModePreset to OMX_Video_Enc_User_Defined along with your slice settings. You should be able to get the slices in each frame.

Please do this change in your iLclient_utils.c

Ram