[DM8168] encoder problem: after I setted rate control alg to CBR , the order of H264 stream is wrong

he yang1

Hi, I use DM8168 with RDK4.0.

Current Codec version is： 02.00.06.00, After I change setting of rc from vbr to cbr, the order of the bit stream is wrong . the attached bitstream is recorded by VLC player .

The params of Encode is shown as below when the error occured:

[m3video] --------- CH 0 : H264 ENC : Dynamic Params -------
[m3video]
[m3video] videnc2DynamicParams -> inputHeight : 1080
[m3video] videnc2DynamicParams -> inputWidth : 1920
[m3video] videnc2DynamicParams -> refFrameRate : 30000
[m3video] videnc2DynamicParams -> targetFrameRate : 30000
[m3video] videnc2DynamicParams -> targetBitRate : 1000000
[m3video] videnc2DynamicParams -> intraFrameInterval : 30
[m3video] videnc2DynamicParams -> generateHeader : 0
[m3video] videnc2DynamicParams -> captureWidth : 1920
[m3video] videnc2DynamicParams -> forceFrame : -1
[m3video] videnc2DynamicParams -> interFrameInterval : 1
[m3video] videnc2DynamicParams -> mvAccuracy : 2
[m3video] videnc2DynamicParams -> sampleAspectRatioHeight : 1
[m3video] videnc2DynamicParams -> sampleAspectRatioWidth : 1
[m3video] videnc2DynamicParams -> ignoreOutbufSizeFlag : 1
[m3video] videnc2DynamicParams -> lateAcquireArg : -1
[m3video]
[m3video] rateControlParams -> rateControlParamsPreset : 1
[m3video] rateControlParams -> scalingMatrixPreset : 1
[m3video] rateControlParams -> rcAlgo : 1
[m3video] rateControlParams -> qpI : -1
[m3video] rateControlParams -> qpMaxI : 40
[m3video] rateControlParams -> qpMinI : 10
[m3video] rateControlParams -> qpP : -1
[m3video] rateControlParams -> qpMaxP : 40
[m3video] rateControlParams -> qpMinP : 10
[m3video] rateControlParams -> qpOffsetB : 4
[m3video] rateControlParams -> qpMaxB : 44
[m3video] rateControlParams -> qpMinB : 10
[m3video] rateControlParams -> allowFrameSkip : 0
[m3video] rateControlParams -> removeExpensiveCoeff : 0
[m3video] rateControlParams -> chromaQPIndexOffset : 0
[m3video] rateControlParams -> IPQualityFactor : 0
[m3video] rateControlParams -> initialBufferLevel : 2000000
[m3video] rateControlParams -> HRDBufferSize : 2000000
[m3video] rateControlParams -> minPicSizeRatioI : 0
[m3video] rateControlParams -> maxPicSizeRatioI : 640
[m3video] rateControlParams -> minPicSizeRatioP : 0
[m3video] rateControlParams -> maxPicSizeRatioP : 0
[m3video] rateControlParams -> minPicSizeRatioB : 0
[m3video] rateControlParams -> maxPicSizeRatioB : 0
[m3video] rateControlParams -> enablePRC : 0
[m3video] rateControlParams -> enablePartialFrameSkip : 0
[m3video] rateControlParams -> discardSavedBits : 1
[m3video] rateControlParams -> VBRDuration : 8
[m3video] rateControlParams -> VBRsensitivity : 0
[m3video] rateControlParams -> skipDistributionWindowLength : 5
[m3video] rateControlParams -> numSkipInDistributionWindow : 2
[m3video] rateControlParams -> enableHRDComplianceMode : 1
[m3video] rateControlParams -> frameSkipThMulQ5 : 0
[m3video] rateControlParams -> vbvUseLevelThQ5 : 0
[m3video]
[m3video] interCodingParams -> interCodingPreset : 0
[m3video] interCodingParams -> searchRangeHorP : 144
[m3video] interCodingParams -> searchRangeVerP : 32
[m3video] interCodingParams -> searchRangeHorB : 144
[m3video] interCodingParams -> searchRangeVerB : 16
[m3video] interCodingParams -> interCodingBias : 1
[m3video] interCodingParams -> skipMVCodingBias : 1
[m3video] interCodingParams -> minBlockSizeP : 0
[m3video] interCodingParams -> minBlockSizeB : 0
[m3video] interCodingParams -> meAlgoMode : 0
[m3video]
[m3video] intraCodingParams -> intraCodingPreset : 0
[m3video] intraCodingParams -> lumaIntra4x4Enable : 0
[m3video] intraCodingParams -> lumaIntra8x8Enable : 255
[m3video] intraCodingParams -> lumaIntra16x16Enable : 15
[m3video] intraCodingParams -> chromaIntra8x8Enable : 15
[m3video] intraCodingParams -> chromaComponentEnable : 1
[m3video] intraCodingParams -> intraRefreshMethod : 0
[m3video] intraCodingParams -> intraRefreshRate : 0
[m3video] intraCodingParams -> gdrOverlapRowsBtwFrames : 0
[m3video] intraCodingParams -> constrainedIntraPredEnable : 0
[m3video] intraCodingParams -> intraCodingBias : 0
[m3video]
[m3video] sliceCodingParams -> sliceCodingPreset : -96
[m3video] sliceCodingParams -> sliceMode : 8672
[m3video] sliceCodingParams -> sliceUnitSize : 139522
[m3video] sliceCodingParams -> sliceStartOffset : [0 12 0]
[m3video] sliceCodingParams -> streamFormat : 0
[m3video]
[m3video] sliceGroupChangeCycle : 0
[m3video] searchCenter : 0
[m3video] enableStaticMBCount : 0
[m3video] enableROI : 262400
[m3video]
[m3video]

over 9 years ago

0 Margarita Gashova over 9 years ago

TI__Guru* 80190 points

Hello,

he yang1 said:
After I change setting of rc from vbr to cbr, the order of the bit stream is wrong . the attached bitstream is recorded by VLC player .

I am not able to see it, could you reattach it ?

Best Regards,

Margarita

0 he yang1 over 9 years ago in reply to Margarita Gashova

Prodigy 75 points

Hi Margarita:

thanks for your reply, and I can only attach the file as media, Could you pls download the stream.mp4 from the address: http://www.deyisupport.com/question_answer/dsp_arm/davinci_digital_media_processors/f/39/p/78882/195745.aspx#195745

or give me you Emai, I will send the file later!

thanks a lot !!!

he yang

0 Margarita Gashova over 9 years ago in reply to he yang1

TI__Guru* 80190 points

Hello,

I am not familiar with DVR RDK but you could try to set these settings:

IVIDEO_RateControlPreset set to IVIDEO_LOW_DELAY

IH264ENC_RateControlAlgo set to IH264_RATECONTROL_PRC_LOW_DELAY

rateControlPreset set to IVIDEO_USER_DEFINED

HRDBufferSize should be equal to initialBufferLevel and for CBR must to be 1/2 * targetBitRate

In case to avoid skip frames, you could set these parameters skipDistributionWindowLength and numSkipInDistributionWindow as follows:

rateControlParams.skipDistributionWindowLength = 5;

rateControlParams.numSkipInDistributionWindow = 0;

This will make sure that in CBR mode, none of the frames are skipped.

allowFrameSkip = 1

enablePartialFrameSkip = 1

numSkipInDistributionWindow = 2

skipDistributionWindowLength = 5

should be enabled if your application allows frame skip and strictly meeting targetBitrate is critical.

Hope this helps.

You also could post your query in the Multimedia codec forum:

Best Regards,

Margarita

0 Murali Vijayan over 9 years ago in reply to Margarita Gashova

TI__Intellectual 1015 points

Hi,

Please tell me what are the changes you are doing to switch from vbr to cbr
Check by disabling B frame coding? If works please make sure that display delay is given properly when enabling B frame.
Please check by increasing target bitrate
Please share the 264 stream, So that I can analyze frame by frame in analyzer.

Regards,
Murali

0 he yang1 over 9 years ago in reply to Murali Vijayan

Prodigy 75 points

Hi Murali:

Thanks for your reply!!

I set these parameters as follows when I am doing to switch from vbr to cbr:

allowFrameSkip = 1

enablePartialFrameSkip = 1

numSkipInDistributionWindow = 2

skipDistributionWindowLength = 5

rcAlgo = 1

targetBitRate = 1000000

HRDBufferSize is equal to initialBufferLevel and for CBR must to be 1/2 * targetBitRate

And B frame coding is disabled !

How can I share the stream , Could you tell me your email ? I will send it later !!

You can also download it from : http://www.deyisupport.com/question_answer/dsp_arm/davinci_digital_media_processors/f/39/p/78882/195634.aspx#195634

The file named "stream.mp4"

best regards

he yang

0 Murali Vijayan over 9 years ago in reply to he yang1

TI__Intellectual 1015 points

Hi,

Have you tried by increasing bitrate?

Regards,

Murali

0 he yang1 over 9 years ago in reply to Murali Vijayan

Prodigy 75 points

Murali:

thanks for your reply, and did your got the bitstream named "stream.,p4"?

Have you tried by increasing bitrate?

Yes , It can work well by increasing bitrate to 4M in CBR mode (1080p @60fps)!,

But we want to control the bitrate in less than 1M sometime , So what should I do now?

0 Murali Vijayan over 9 years ago in reply to he yang1

TI__Intellectual 1015 points

Hi he yang,
I got "stream.mp4" from the link you shared.
Can you please try by increasing the QP(Mostly Qmin ) of I and P frame in encoder params? It will reduce number of skip frames but quality(PSNR) will be reduced.

Regards,
Murali

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[DM8168] encoder problem: after I setted rate control alg to CBR , the order of H264 stream is wrong