Multi-chan HD video Capture using Dm8168

Xavier

Other Parts Discussed in Thread: TVP5158

Hi,

I do developpment on the DM8168 EVM board+Vs child Board, and DVRRDK_02.00.00.23 is used to do software developmment.

As DM8168 can encode 3 channels of 1080p /60fps video image, i want to use it to encode 5 channels of xga video image.

And i find only three vports tow for capturing and one for display, then how can capture the video images more than tow channels?

I think two meothds to solve this problem.

1. Using PCIe + video capture board

2.Using FPGA capture and sharing mem with Dm8168

All this two shemes are not so easily to completed.

Is there other sheme? Link for TVP5185 capture 4 D1 video image at the same time?

xavier

thank you

over 13 years ago

Brett Kuehner over 13 years ago

Intellectual 540 points

Each 5158 can pull in up to 4 channels of video, which get multiplexed into a stream going to the 8168. The EVM I have has a daughterboard with four 5158s, allowing 16 channels of simultaneous input.

Xavier over 13 years ago in reply to Brett Kuehner

Genius 3180 points

TVP5158 not support HD

HardikShah over 13 years ago in reply to Xavier

TI__Mastermind 20245 points

Hi,

Video capture H/W supports upto 4 8-bit ports. So for XGA you can use BT656 kind of input which is 8-bit. With this you will be able to capture 4-XGA streams. You may have to use FPGA to convert XGA BT1120 to XGA BT656 format.

Regards,

Hardik Shah

Xavier over 13 years ago in reply to HardikShah

Genius 3180 points

Hi, Hardik Shah

Thank you for your replay! Is there any chip can completed convert XGA BT1120 then ?

HardikShah over 13 years ago in reply to Xavier

TI__Mastermind 20245 points

Hi,

I am not aware of any such chip. I think you may have to use FPGA.

Regards,

Hardik Shah

Xavier over 13 years ago in reply to HardikShah

Genius 3180 points

Ok! If bt656 xga is used ,the image quality will loss then ?

Steve Clynes over 13 years ago in reply to Xavier

TI__Mastermind 43875 points

Both 656 and 1120 will suffer a color fidelity loss, yes, since you will be both converting to YUV and decimating the chroma channel.

BR,

Steve

Xavier over 13 years ago in reply to Steve Clynes

Genius 3180 points

If bt656, the image will be down sample to 720?

Steve Clynes over 13 years ago in reply to Xavier

TI__Mastermind 43875 points

There will not be any resolution down sampling, no.

656 is simply a data transfer protocol. There is no inherent change in the data.

What is really happening is that the 656 protocol is being 'modified' in order to transfer an image of different size/frame rate etc...

All we are really using from the 656 protocol is the concept of SAV and EAV coding to encapsulate a video image frame.

BR,

Steve

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Multi-chan HD video Capture using Dm8168