H.264 Decoder Output in YUV420

Konstantin Primenko

Other Parts Discussed in Thread: OMAP3530

I have omap3530 custom board. And I use dvsdk 4_01_00_09 with "H.264 Baseline Profile Decoder (v2.01) on OMAP3530". Datasheet of the decoder says that "Outputs are available in YUV420 planar and
YUV422 interleaved". But gst-ti-plugin(TIViddec2 element) outputs in YUV422 interleaved. How can I force gst-ti-plugin to output in YUV420 planar(NV12) format?

over 12 years ago

0 Cvetolin Shulev-XID over 12 years ago

TI__Guru 65405 points

Hi Konstantin,

The omap3530 supports both data formats YUV422 and YUV420 as you read. About the gst-ti-plugin you could try with "oColorSpace=YUV420P" or "oColorSpace=YUV420I" parameters but can you share your pipe line to clarify the situation?

You can obtain some additional details from GStreamer pipelines examples at the link:

http://processors.wiki.ti.com/index.php/Example_GStreamer_Pipelines

Tsvetolin Shulev

0 Konstantin Primenko over 12 years ago in reply to Cvetolin Shulev-XID

Intellectual 260 points

My pipeline:

gst-launch -v filesrc location=/host/davincieffect_qcif_192kbps.264 ! TIViddec2 codecName=h264dec engineName=codecServer displayBuffer=false ! "video/x-raw-yuv,format=(fourcc)NV12" ! filesink location=/host/test.yuv > /host.gst.out 2>&1

But it doesn't work.

This works fine:

gst-launch -v filesrc location=/host/davincieffect_qcif_192kbps.264 ! TIViddec2 codecName=h264dec engineName=codecServer displayBuffer=false ! "video/x-raw-yuv,format=(fourcc)UYVY" ! filesink location=/host/test.yuv > /host.gst.out 2>&1

The chunk of TIViddec2 source code:

<code>

    /* Set up codec parameters depending on device */
    switch(device) {
        case Cpu_Device_DM6467:
            #if defined(Platform_dm6467t)
            params.forceChromaFormat = XDM_YUV_420SP;
            params.maxFrameRate      = 60000;
            params.maxBitRate        = 30000000;
            #else
            params.forceChromaFormat = XDM_YUV_420P;
            #endif
            params.maxWidth          = VideoStd_1080I_WIDTH;
            params.maxHeight         = VideoStd_1080I_HEIGHT + 8;
            colorSpace               = ColorSpace_YUV420PSEMI;
            defaultNumBufs           = 5;
            break;
        #if defined(Platform_dm365)
        case Cpu_Device_DM365:
            params.forceChromaFormat = XDM_YUV_420SP;
            params.maxWidth          = VideoStd_720P_WIDTH;
            params.maxHeight         = VideoStd_720P_HEIGHT;
            colorSpace               = ColorSpace_YUV420PSEMI;
            defaultNumBufs           = 4;
            break;
        #endif
        default:
            params.forceChromaFormat = XDM_YUV_422ILE;
            params.maxWidth          = VideoStd_D1_WIDTH;
            params.maxHeight         = VideoStd_D1_PAL_HEIGHT;
            colorSpace               = ColorSpace_UYVY;
            defaultNumBufs           = 3;
            break;
    }

    GST_LOG("opening video decoder \"%s\"\n", viddec2->codecName);
    viddec2->hVd = Vdec2_create(viddec2->hEngine, (Char*)viddec2->codecName,
                      &params, &dynParams);

    if (viddec2->hVd == NULL) {
        GST_ELEMENT_ERROR(viddec2, STREAM, CODEC_NOT_FOUND,
        ("failed to create video decoder: %s\n", viddec2->codecName), (NULL));
        GST_LOG("closing codec engine\n");
        return FALSE;
    }

</code>

if I change marked line to params.forceChromaFormat = XDM_YUV_420SP; I get error "failed to create video decoder: h264dec".

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H.264 Decoder Output in YUV420