HDVICP performance on 8148

Bernard Vachon

Hi,

Should the HDVICP2 on the 8148 be able to simultaneously encode and decode 720p60 video. Since 2x1280x720x60 < 1920x1080x60 I expected it would. However, running a captrure-encode-decode-scale-display chain (such as the one provided on http://processors.wiki.ti.com/index.php/Latency_Measurement_on_Capture_Encode_Decode_Display_Demo) on the 8148, I get results indicating the HDVICP2 is not keeping up, ultimately dropping frames.

Bernard

over 13 years ago

0 Bernard Vachon over 13 years ago

Intellectual 465 points

By default the ARM Cortex A8 on the DM8148-EVM runs at 600MHz and the HDVICP runs at 3067MHz. At those clock rate the dm8148 cannot encode/decode 2x720p60. I was able to change the HDVICP clock to 410MHz and the ARM to 720MHz (done through u-boot). At those clock speeds, the dm8148 was able to simultaneously encode and decode 720p60.

0 Andrea Scian over 13 years ago in reply to Bernard Vachon

Intellectual 1000 points

Dear Bernard,

I've found your topic very interesting.

I'm working on a TI8148EVM with capture_encode demo to check capture/encode performance of this platform with a 1080p60 input.

I'm experiencing a frame drop when looking inside the captured file that I cannot understand if it's caused by VFCC o VENC

Did you try to capture at 1x1080p60 or only 2x720p60?

How did you find that you lost some frames? I'm not a video expert but, with ffmpeg and imagemagik, I've build a custom hi-bitrate sequence with all frames numbered and I see that I "miss" nearly 400 frames in a 2800 frames capture!

Best Regards and thanks in advance

Andrea

0 Bernard Vachon over 13 years ago in reply to Andrea Scian

Intellectual 465 points

Andrea,

I determined the source of the dropped frames by gathering timestamps for the Fill Buffer Done and Empty Buffer Done events for every component (something very similar to the stats they collect in the latency measurement on this page http://processors.wiki.ti.com/index.php/Latency_Measurement_on_Capture_Encode_Decode_Display_Demo)

I was able to see the Empty Buffer Done event on the VENC was occurring every 21 ms while the Fill buffer Done event on the VFCC was occurring every 16ms. Clearly, the VENC was not keeping up.

Bernard

0 Hitesh Viradiya over 12 years ago in reply to Bernard Vachon

Expert 1505 points

Hi Bernard,

I want to increase my u-boot of DM8148 so that ARM and HDVICP clock can increased up to MAX value that it can run.

It will helpful to me If you can tell me where to change it in u-boot ?

Thanks,

HiteshV

0 yu wang89112 over 12 years ago in reply to Hitesh Viradiya

Prodigy 110 points

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HDVICP performance on 8148