Ezsdk encode example

rutuja patil

Hello

We are trying to dynamically change the quantization parameter of ezsdk encode example for each frame by accessing the encoder configuration tDynamicParams.videoDynamicParams.h264EncDynamicParams.ratecontrolParams.qpI and qpP.

We are displaying the bits generated for each frame by printing the value of pbufferOut->nFilledLen.

No matter what initial qp we provide in the range of -1 to 51 the generated bits for each frame remain the same.

They are expected to change dynamically with the qpI or qpP alloted for that frame but it does not seem to be happening.What is it that we are doing wrong..or is there any other encoder parameter that needs to be set so that the encoder accepts user defined quantization parameters.

Thank you

Regards

over 11 years ago

0 Margarita Gashova over 11 years ago

TI__Guru* 80190 points

Hello,

Check this e2e forum thread:

http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/717/p/236608/829445.aspx

Hope this helps.

Best Regards,

Margarita

0 rutuja patil over 11 years ago in reply to Margarita Gashova

Prodigy 250 points

hello Margarita

Your link was helpfull. However we now have doubts regarding how to calculate the bitrate for the new

qp streams.It is understood that the encoder does not encode according to the dynamically allocated bitrate as it is now configured in the FIXED qp mode. But do we sum all the bits generated in 60 frames and call that the bitrate of encoder? It comes out to be way too many bits.

Thanks

Regards

0 rutuja patil over 11 years ago in reply to Margarita Gashova

Prodigy 250 points

hey

We are reading the generated bits from pBufferOut->FilledLen in the IL_ClientBitOutputStreamWriteTask().

Does this buffer give additional bits like header bits along with the actual data?As if the size of input file is 147KB we are getting 9578496 bits for first frame itself. The intraframeinterval is selected as 16.

Thanks

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Ezsdk encode example