K2H EVM: Confirm H264 encode/decode performance

Hi Kaka,

You can check C66x H.264 HP encoder data sheet for performance details (attached). Number of cores mainly depends on used configuration (Base profile, main profile, high profile).

Please let us know if you have further questions,

6545.H264_High_Profile_Encoder_C6678_DataSheet[1].pdf

Thank you,

Paula

Hi Paula,

Thank you for your response. 

I checked your attached document.  Please let me confirm my understanding because I am not well versed in video codecs.

This encoder could not correspond for the following resolution and frame rate.

  Resolution: 1080p                 Frame Rate: 60f

If correspond to this case, we need to prepare the new H264 decoder which supports the level up to 4.2.

Is my understanding correct? And if my understanding is correct, do you have a plan to make the encoder which supports the level up to 4.2?  Or is this request difficult / tough for one 66AK2H12 to process this case?

If yes, how many Keystone devices do we need in order to process it?

If you have any questions, please let me know.

Best regards.

Kaka

Hi Paula,

I might have mistakes for my understanding in my previous post.

Would you please explain about "420p_8bit.yuv, YUV420, CABAC, VBR, IBBP @ 8Mbps @ 30 frames per second" in "Test Description" at Table 2 in detail?

I understand that this test condition was used "airshow_p1920x1080.yuv" as input source. (i.e. Input the video which is 1920*1080* 30frame.)However, I could not understand about any other conditions.

If you have any questions, please let me know.

Best regards.

Kaka

Hi Kaka,

For Encoding 1080p60 we would need two 8-core DSPs chips, however, current H.264 HP encoder is multicore but no ready multichip, some changes on the encoder software architecture would need to be done. This changes are not currently on the H.264 HP encoder roadmap.

 Table 1 of previous attached datasheet is a summary of used configuration in order to get cycle numbers.

For example CBR/VBR -> Refers to rate control Constant or Variable Bit Rate, this has not main repercution on performance. VBR could give better Video Quality but some applications required CBR.

IPPP vs IBBP -> B-frames helps to improve compression efficiency but increase complexity and use more cycles

CAVLC vs CABAC -> Cabac helps to improve compressin efficiency but it is more complex than CAVLC and use more cycles

YUV420 -> refers to the raw input video format which is YUV, whith Chroma U and V subsampling.

Airshow 1080p30 clip was used for profiling numbers.

Let us know if you have further questions.

thank you,

Paula

Hi Paula,

Thank you for your response and explanation. Please let me confirm your previous answers.

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For Encoding 1080p60 we would need to 8-core DSPs chips, however, current H.264 HP encoder is multicore but no ready multichip, some changes on the encoder software architecture would need to be done.

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[Question.1]

Is this means as below?

 If encoding 1080p60, we need to use two C6678 devices. And customer need to develop the H.264 HP encoder library in order to correspond to multichip at this time.

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Table 1 of previous attached datasheet is a summary of used configuration in order to get cycle numbers.

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[Question.2]

The result shows cycles in order to make 1 frame.

Is my understanding correct? I could not understand the meaning of this value what it shows.

If you have any question, please let me know.

Best regards.

Kaka

Hi Paula,

Thank you for your answers. My questions have been solved by your answers.

If I will have more questions for this topics, please let me confirm them to you.

Best regards.

Kaka