DSPC 8681 performance question

Anuj Mittal

I'm trying to run the MPEG2 to H.264 transcode demo available in video MCSDK 2.1. But, I'm not getting fps of more than ~16.

The input is a 8Mbps 1080p MPEG2 Main profile 24 fps & I'm encoding it to 1080p H.264 24 fps 8 Mbps CAVLC High@L4.0. We're running the card in 1.25 Ghz mode. We get around ~13 fps in 1 Ghz mode. The encoder is configured to use cores 8-15 & decoder is running on core 0 as per the configuration file in the demo.

Could you please help me understand if this is a system limitation or a demo limitation or if there's something that I am not doing right?

Thanks!

over 10 years ago

0 Raja over 10 years ago

TI__Guru* 81335 points

Hi Anuj,
Working with expert to answer this post.
Please refer below threads which were discussed about performance,
http://e2e.ti.com/support/dsp/c6000_multi-core_dsps/f/639/t/196711
http://e2e.ti.com/support/dsp/c6000_multi-core_dsps/f/639/t/211448
Thank you.

0 Paula Carrillo over 10 years ago in reply to Raja

TI__Mastermind 38820 points

Hi Anuj,

From where are you reading or how are you measering FPS?

FYI, our latest MCSDK video 2.2 can be download from: http://software-dl.ti.com/sdoemb/sdoemb_public_sw/mcsdk_video/02_02_00_45/index_FDS.html

thank you,

Paula

0 Anuj Mittal over 10 years ago in reply to Paula Carrillo

Prodigy 230 points

Hi Paula

Thank you for replying. I'm looking at what the demo reports to be the average fps. Plus, I can easily see looking at the time it takes for the demo to transcode that the fps is somewhere between 19-21.

I'm getting better performance with 2.2.0.45, FPS is somewhere between 28-32 which is what I want for real-time streaming. But, I'm running into other problems with this SDK as well as the one I was using earlier.

I'm using PCIe H.264 HP decoder demo & if I use a HP file with B frames as input, the output produced is choppy. Can you help me understand why?

The inputs with Baseline profiles work ok & so do HP streams with no B frames.

Thank you.

0 Paula Carrillo over 10 years ago in reply to Anuj Mittal

TI__Mastermind 38820 points

Hi Anuj,

Maybe mpeg2 dec output is not set to display order?, please check in configuration files params to see if there is a param to change/test

thank you,

Paula

0 Paula Carrillo over 10 years ago in reply to Paula Carrillo

TI__Mastermind 38820 points

Hi Anuj, one thing to try is to increase "displayDelay" in decoder configuration params. Attached example

codecParams_dec_displaydelayInc.cfg

Thank you,

Paula

0 Paula Carrillo over 10 years ago in reply to Paula Carrillo

TI__Mastermind 38820 points

Hi Anuj, I colleague point me that you were asking about H264 HP decoder "displayDelay" instead of Mpeg2 dec.. Apologize, I over see you question. Anyhow, please change in your H264 HP dec configuration param the value of displayDelay from 1 to your subgop size number. On top of my head I recall this value can be up to 8.

thank you,

Paula

0 Anuj Mittal over 10 years ago in reply to Paula Carrillo

Prodigy 230 points

Thank you Paula. That helped & solved my problem.

Thanks again for your help.

Anuj

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DSPC 8681 performance question