C6a816x H.264 Encode Demo CBR mode

Greg,

The following should help you to change to CBR -

    OMX_VIDEO_PARAM_ENCODER_PRESETTYPE tEncoderPreset;
    OMX_TEST_INIT_STRUCT_PTR(&tEncoderPreset,
                             OMX_VIDEO_PARAM_ENCODER_PRESETTYPE);
    tEncoderPreset.nPortIndex = OMX_VIDENC_OUTPUT_PORT;
    eError =
        OMX_GetParameter(pHandle, OMX_TI_IndexParamVideoEncoderPreset,
                         &tEncoderPreset);
    tEncoderPreset.eRateControlPreset  = OMX_Video_RC_Low_Delay; /* CBR */
   // tEncoderPreset.eRateControlPreset  = OMX_Video_RC_Storage; /* VBR */
    eError =
        OMX_SetParameter(pHandle, OMX_TI_IndexParamVideoEncoderPreset,
                         &tEncoderPreset);

Regards,

Anirban

Hi Anirban,

Thanks for the reply.  I will try this.  This, I assume, involves recompiling the source?  Is there anyway to change this preset value by using the OMS scripts?

Thanks,

-Greg

Anirban,

Can you point to a specific file that contains that data? I did a quick search and the only one i could find that is close to what you listed there is for the omap4430.

I am using the following ezdsk and am looking in the OMTB demo folder:

ti-ezdsk_dm816x-evm_5_01_01_80

Thanks for your help,

Mark

Anirban,

I've made some headway but I'm hoping for some clarification. I found in the OMTBH264Venc.c file where the tEncoderPreset.eRateControlPreset is set to "OMX_Video_RC_User_Defined" for the DM8168 OTMB demo. I then went in tried changing it to both OMX_Video_RC_Storage and OMX_Video_RC_Low_Delay then created videos.

However, both videos appear to be about the same. And when using streamEye software from elecard. It says for both videos that they are using VBR.

Any ideas or insight? I'd really like to confirm that I am switching to CBR.

Thanks for your help!

~Mark

Anirban,

Any further thoughts on this? Both myself and my customer have confirmed that the change I made does not produce CBR video encoding. We are eager to evaluate the system and its capabilities but this is currently a stopgap.

Thanks,

Mark

Mark,

Please use the following commands for configuration of CBR/VBR in  OMTB script file.

omx api getparam  h264venc 0 0 1 OMX_TI_IndexParamVideoEncoderPreset

#eRateControlPreset is set to "disable => CBR" or  "hq(high quality) => VBR"

#omx setp 0 h264venc OMX_TI_IndexParamVideoEncoderPreset eRateControlPreset hq

omx setp 0 h264venc OMX_TI_IndexParamVideoEncoderPreset eRateControlPreset disable

omx api setparam  h264venc 0 0 1 OMX_TI_IndexParamVideoEncoderPreset

Attached oms script, contains the configurations mentioned above.

#omx omtb_dbg_lvl 0x10
#omx omtb_dbg_lvl 0x08
omx api init
omx setp 0 h264venc numinbuf 6
omx setp 0 h264venc inbufsize 3110400
omx setp 0 h264venc frame_width 1920
omx setp 0 h264venc frame_height 1080
omx setp 0 h264venc numoutbuf 6
omx setp 0 h264venc inbufsize_flag enable
omx setp 0 h264venc outbufsize_flag enable
omx setp 0 h264venc outbufsize 3110400 
omx setp 0 h264venc inbuf allocate
omx setp 0 h264venc outbuf allocate
omx setp 0 h264venc data_opmode file
omx setp 0 h264venc data_ipmode file
omx setp 0 h264venc filereset_flag enable
omx setp 0 h264venc infile  station2_1920x1080_420sp.yuv
omx setp 0 h264venc outfile dm816x_test_encode.264
#Q-16 format 2^16 * framerate
omx setp 0 h264venc framerate 3932160
omx api gethandle h264venc 0 0
omx api getparam  h264venc 0 0 0 OMX_IndexParamPortDefinition
omx setp 0 h264venc OMX_IndexParamPortDefinition video.nStride 1920
omx api setparam  h264venc 0 0 0 OMX_IndexParamPortDefinition
omx api getparam  h264venc 0 0 1 OMX_IndexParamVideoBitrate
omx setp 0 h264venc OMX_IndexParamVideoBitrate nTargetBitrate 2048000
omx setp 0 h264venc OMX_IndexParamVideoBitrate eControlRate variable
omx api setparam  h264venc 0 0 1 OMX_IndexParamVideoBitrate
omx api getparam  h264venc 0 0 1 OMX_TI_IndexParamVideoEncoderPreset
#eRateControlPreset is set to "disable => CBR" or  "hq(high quality) => VBR"
#omx setp 0 h264venc OMX_TI_IndexParamVideoEncoderPreset eRateControlPreset hq
omx setp 0 h264venc OMX_TI_IndexParamVideoEncoderPreset eRateControlPreset disable
omx api setparam  h264venc 0 0 1 OMX_TI_IndexParamVideoEncoderPreset
omx api sendcommand port h264venc 0 enable 0
omx api sendcommand port h264venc 0 waitforsem 0
omx api sendcommand port h264venc 0 enable 1
omx api sendcommand port h264venc 0 waitforsem 1
omx api sendcommand state h264venc 0 idle
omx api sendcommand state h264venc 0 waitforsem
sleep 500
omx api sendcommand state h264venc 0 exec
omx api sendcommand state h264venc 0 waitforsem
sleep 120000
omx api sendcommand state h264venc 0 idle
omx api sendcommand state h264venc 0 waitforsem
omx api sendcommand state h264venc 0 loaded
omx api sendcommand state h264venc 0 waitforsem
omx api freehandle h264venc 0
omx api uninit