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About dm8127 ipnc3.2 output h264 stream more wider

gomo
Genius 3400 points


Hi all

When DM8127 camera run ipnc3.2, the width of output h264 stream(play by vlc) is
wider(like 1440*480) than the actual width(720*480).
The output h264 stream are as fllows:

When run ipnc3.2 system_server and ipnc3.0 wis-streamer, the output h264 stream width is also wrong.

but run ipnc3.0 system_server and run ipnc3.2 wis-streamer,the output h264 stream width is ok.

who knows why? or give us some advice. 
Thanks a lot! 

  • 0
    Genius 3400 points

    BTW, I know I can set the "Source aspect ratio" to adjust the vlc default display ratio. But I want to know what lead to the different default aspect ratio  between IPNC 3.2 and IPNC 3.0.

    Thanks a lot.

     

  • 0 in reply to gomo
    TI__Expert 5000 points

    Hi 

    Can you change the following and see the difference in behavior?

    ipnc_mcfw/mcfw/src_bios6/links_m3video/iva_enc/encLink_h264.c:718: staticParams->vuiCodingParams.aspectRatioIdc = IH264ENC_ASPECTRATIO_EXTENDED;

  • 0 in reply to Venugopala
    Genius 3400 points

    Thanks for your reply at first.

    I change aspectRatioIdc to IH264ENC_ASPECTRATIO_160_99, using the vlc to connect the live video. the default aspect ratio do not change.

    staticParams->vuiCodingParams.aspectRatioIdc = IH264ENC_ASPECTRATIO_EXTENDED;
    /* As we are setting the aspectRatioIdc to EXTENDED value,
        we need to provide the SAR WIDTH and SAR HEIGHT also , which is in Dynamic parameters*/

    And in the function of enclink_print_dynamic_params(), I track the sampleAspectRatioWidth and sampleAspectRatioHeight, it's correct(1280x720).

    Have other advices?

  • 0 in reply to gomo
    Genius 3400 points

    Hi, I replace the H264 code lib to ipnc3.0, but the default aspect ratio is not correct.

    REL.500.V.H264AVC.E.IVAHD.02.00.04.00 to REL.500.V.H264AVC.E.IVAHD.02.00.02.02

  • 0 in reply to gomo
    Genius 3400 points

    hi，

          Compare the file encLink_h264.c in IPNC3.0 with IPNC3.2, I found the differeces in the function of enclink_h264_set_dynamic_params(),

          In IPNC 3.2, It add the sampleAspectRatio setting operation。

         . /* dynamicParams->videnc2DynamicParams.sampleAspectRatioWidth =   algDynamicParams->inputWidth; 

              dynamicParams->videnc2DynamicParams.sampleAspectRatioHeight =  algDynamicParams->inputHeight; */ 

           I delete these two parameters setting. The vlc default aspect ratio is correct. 

           It's conflict with the follow setting and the document introduce.

             staticParams->vuiCodingParams.aspectRatioInfoPresentFlag = 1;

             staticParams->vuiCodingParams.aspectRatioIdc = IH264ENC_ASPECTRATIO_EXTENDED;

             /* As we are setting the aspectRatioIdc to EXTENDED value, we need to provide the SAR WIDTH and SAR HEIGHT also , which is in Dynamic parameters */ 

             and at the document of "H264_Encode_HDVICP2_UserGuide.pdf"

            See Table E-1 of H264 standard or enum IH264ENC_AspectRatioIdc for valid values. When aspectRatioIdc == IH264ENC_ASPECTRATIO_EXTENDED(255), encoder will look at IVIDENC2_DynamicParams::sampleAsp ectRatioHeight and IVIDENC2_DynamicParams::sampleAspectRatioWidth and use them as sar_height and sar_width respectively. aspectRatioIdc is left to user to provide correct value.

             if aspectRatioInfoPresentFlag ==0 then encoder ignores this parameter 

             Who can tell me what's the reason. Thanks a lot.