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Beginner
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Ratecontrol CQP

Hi,

I would like to know what is exaclty the range of QPI, QPP, QPB for RateControl CQP?

I assumed it was [0,51] but the h264 encoder init function returns Invalid parameter if I set QBI = QPP = QPB = 0.

Thanks

Karine

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Employee
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Hi Karine,

QP value range is 0-51. And there should be no issues setting the value to 0.

I performed a quick check here on my side and it works fine.

If you are still encountering issues, please provide a Media SDK trace log, so that we can better understand you complete encoder configuration to determine potential issues.

Regards,
Petter 

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Beginner
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Hi Petter,

I just noticed this bug only occurs on the h264 SW encoder, the QSV works well.

Do you test the SW encoder?

Thanks

Karine

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Employee
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Hi Karine,

I did a quick test using SW path. it works fine using QPI = QPP = QPB = 0.

Are you SW library from Media SDK 2013?

Regards,
Petter 

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Beginner
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Hi Petter,

It is Media SDK 2013.

I will try to give you some extra informations. How do we enable the Intel Media SDK log?

Thanks

Karine

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Employee
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Hi Karine,

In the Media SDK tools folder you will find the "mediasdk_tracer" tracer tool. To capture a log just launch the tool and start capturing before running your workload. When done, click Stop and retrieve the log.

Regards,
Petter 

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Beginner
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Hi Petter,

This is the 2 files I generated with your logging tool:

- the file analyzerSW.log is the log file generated when I set QP=0 with the h264 SW encoder. In this file you can see the error return by the Init function.

- the file analyzerQSV.log is the log file generated with same parameter but with the h264 QSV encoder

I hope this helps, let me know if you need something else.

Thanks

Karine

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Beginner
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Hi Petter,

This is the 2 files I generated with your logging tool:

- the file analyzerSW.log is the log file generated when I set QP=0 with the h264 SW encoder. In this file you can see the error return by the Init function.

- the file analyzerQSV.log is the log file generated with same parameter but with the h264 QSV encoder

I hope this helps, let me know if you need something else.

Thanks

Karine

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Employee
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Hi Karine,

unfortunately your log files did not get attached to your post.

Could you please try to upload the log files again?

Regards,
Petter

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Beginner
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Sorry I have some proxy problem to upload.

It should work this time.

Karine

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Employee
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Hi Karine,

thanks for the logs. From what I can see, it looks like the reason for the issue is that QPI = QPP = QPB = 0 is not allowed for target usage = 7 (speed).

If you set target usage to a value from 1-6, it works.

I will check with codec expert and get back to you on why this is the case.

Regards,
Petter 

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Employee
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Hi again Karine,

Many thanks for reporting the issue.

This specific configuration was confirmed to be a bug in the Media SDK SW DLL. Fix will be introduced in future release of the Media SDK.

Regards,
Petter 

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Beginner
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Thanks, I will patch it on my current implementation.

Regards

Karine

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