Q:how to set displayDelay in H264dec?

Hi:

I test H264dec with dvsdk_3_10_00_19 and dm6467t.

I run the encodedecode demo and found that the displaying is delay than captureing.

The message the first second output is :

Encode Decode demo ARM Load: 0% DSP Load: 100% Display Type: D1 PAL Video Codec: H.264 BP Video fps: 9 fps Video bit rate: 179 kbps Video resolution: 720x576 Time: 08:00:01

That lost 16frame(the video souce is PAL 25fps).

I saw the datesheet and found that the default displayDelay value is 16,so I want to change it,but found not afect.

Here is my change code:

        IH264VDEC_Params extdecParams;
        extdecParams.viddecParams = *decParams;
        //extdecParams.viddecParams.size = sizeof(IH264VDEC_Params);
        extdecParams.displayDelay = 0;//16;
        extdecParams.presetLevelIdc = Level4;
        extdecParams.presetProfileIdc = Profile_Any;
        extdecParams.temporalDirModePred = 1;

        hVd2 = Vdec2_create(hEngine, envp->videoDecoder,
                (VIDDEC2_Params*)&extdecParams, decDynParams);

What is wrong ?

zcliang

0 Mahantesh S Madiwalar over 14 years ago

TI__Intellectual 1790 points

Hi Zcliang,

I will come back on this probably on Monday.

Regards,

Mahantesh

0 zhencheng liang over 14 years ago in reply to Mahantesh S Madiwalar

Intellectual 330 points

Hi,

I see that using the extern Params must reset extdecParams.viddecParams.size.

I have set that as

extdecParams.viddecParams.size = sizeof(IH264VDEC_Params);//val is 44

and

extdecParams.displayDelay = 0;

But the first second always display only 8fps:

Encode Decode demo ARM Load: 0% DSP Load: 100% Display Type: D1 PAL Video Codec: H.264 BP Video fps: 8 fps Video bit rate: 143 kbps Video resolution: 720x576 Time: 08:00:01

And the image the TV output don't sync with the capture,seem as the delay(about half of second) of the capture.

What should I do for that?

zcliang

0 Mahantesh S Madiwalar over 14 years ago in reply to zhencheng liang

TI__Intellectual 1790 points

Zcliang,

For more information on display delay versus frame resolutions please refere the codec user section 3.2.

Regards,

Mahanteh

0 Mahantesh S Madiwalar over 14 years ago in reply to Mahantesh S Madiwalar

TI__Intellectual 1790 points

Zcliang,

Corrected the previous update....

For more information on display delay versus frame resolutions please refere the codec user guide section 3.2.

Regards,

Mahanteh

0 Hai Zhang1 over 12 years ago

Prodigy 40 points

have you solve the displaydelay problem,please tell me the solution, thanks

0 ryan tang over 12 years ago in reply to Hai Zhang1

Prodigy 10 points

i want to know the issue too.

have you solved the problem?

and i have not found the user guide the TI said

my qq:357889637

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Q:how to set displayDelay in H264dec?