DM368 Platinum encoder frame rate in SPS when enableVUIParams = 1

Frank Talbot

Hi,

I cannot seem to get the frame rate information to be inserted into the H.264 stream when I have enableVUIParams set to 1. Relevant settings:

<code>

pCodecParams_->videncParams.maxFrameRate = (XDAS_Int32)(1000.0*sharedData_->frameRate_)

pCodecParams_->enableVUIparams = 1;
pDynamicParams_->enableBufSEI = 1;

pDynamicParams_->enablePicTimSEI                        = 1;
pDynamicParams_->videncDynamicParams.refFrameRate               = (XDAS_Int32)(1000.0*sharedData_->frameRate_);
pDynamicParams_->videncDynamicParams.targetFrameRate            = (XDAS_Int32)(1000.0*sharedData_->frameRate_);

</code>

However, if I set enableVUIParams to 4 and fill in VUI_Buffer appropriately, the frame rate shows up in the H.264 stream.

How do I get this working with enableVUIParams == 1?

over 12 years ago

0 Veeranna Hanchinal over 12 years ago

TI__Expert 8465 points

Hi,

Is frame_rate info present in VUI NAL ? I dnt think so. when enableVUIParams = 1 codec populats standard specified VUI syntax elements. If you want customized VUI, better you go with enableVUIParams=4 option.

Thanks,

Veeranna

0 Frank Talbot over 12 years ago in reply to Veeranna Hanchinal

Intellectual 560 points

num_units_in_tick and time_scale are present in the standard specified VUI NAL, which is what most tools appear to use to calculate the frame rate. These aren't being filled in when enableVUIParams=1, only if I do it manually with enableVUIParams=4. These aren't custom values.

0 Veeranna Hanchinal over 12 years ago in reply to Frank Talbot

TI__Expert 8465 points

num_unit_in_tick and time_scale can populate in VUI by setting "Dynamic->VUI_Buffer->timingInfoPresentFlag". Please refer encoder user guide for more info on these params.

Thanks,

Veeranna

0 Frank Talbot over 12 years ago in reply to Veeranna Hanchinal

Intellectual 560 points

Hi Veerana,

Correct me if I'm wrong, but that still requires that I set enableVUIParams = 4

I want the codec to automatically populate these when enableVUIParams = 1

Ryan

0 Veeranna Hanchinal over 12 years ago in reply to Frank Talbot

TI__Expert 8465 points

Hi Ryan,

I thought you want to override the default values of num_unit_ticks and time_scale. Yes enableVUIParams = 1, Application need not do anything extra, codec will generate VUI with default values(num_unit_ticks=2, time_scale=60). Can you please attach the generated stream here?

Thanks,

Veeranna

0 Frank Talbot over 12 years ago in reply to Veeranna Hanchinal

Intellectual 560 points

Hi Veerana,

I'd like the codec to generate num_unit_ticks and time_scale based on the params I've already provided for frame rate; this is what I assumed it did when enableVUIParams=1.

Attached is a sample stream with enableVUIParams=1. The frame rate is supposed to be 10fps.

Thanks,

Ryan

7848.test.txt

(rename the attached file to test.h264... the forum software wouldn't let me upload anything with an .h264 or .264 extension, for some reason)

0 Veeranna Hanchinal over 12 years ago in reply to Frank Talbot

TI__Expert 8465 points

Hi Ryan,

Codec will not calculate num_unit_tick and time_scale based on frame rate info. Codec just inserts default values(enableVUIParama=1) or user provided values(enableVUIParam=4).

In the attached stream you can see default values.

Thanks,

Veeranna

0 Frank Talbot over 12 years ago in reply to Veeranna Hanchinal

Intellectual 560 points

Hi Veeranna,

That seems like it's an entirely useless feature, then. What is the point of having the codec automatically insert inaccurate information?

Interestingly, MediaInfo does not detect the framerate in the attached stream. It does if I use enableVUIParams=4.

Thanks for your insight,

Ryan

Processors

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DM368 Platinum encoder frame rate in SPS when enableVUIParams = 1