i.MX Processors中的主题 H264 encode

H264 encode

505053487 — Tue, 19 Jan 2016 01:52:49 GMT

I want to use H264codes,but the frame data is in YCbCr 4:2:2 format. Do I need to translate it from YCbCr 4:2:2 to YCbCr 4:2:0 first?

I have seen the demo mxc_vpu_text.

in struct frame_buf *framebuf_alloc(int stdMode, int format, int strideY, int height, int mvCol) function,there is

	fb->addrY = fb->desc.phy_addr;
	fb->addrCb = fb->addrY + strideY * height;
	fb->addrCr = fb->addrCb + strideY / divX * height / divY;
	fb->strideY = strideY;
	fb->strideC = strideY / divX;

it means that the demo is only favor of planar format, not packed format, am i right?

thank you very much.

igorpadykov — Tue, 19 Jan 2016 03:59:10 GMT

Hi dongming

it is not necessary to translate it from YCbCr 4:2:2 to YCbCr 4:2:0,

but provide a 4:2:0 or 4:2:2 vertical formatted input YUV image with a

pre-defined size. Please refer to sect.4.2.3.1 YUV Input Loading

attached VPU Manual.

Best regards

igor

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505053487 — Tue, 19 Jan 2016 05:59:10 GMT

ok，thank you. But i cannot find YUV Input Loading attached VPU Manual. Could you please offer it？

igorpadykov — Tue, 19 Jan 2016 09:03:45 GMT

attached doc will appear some time later (seems system is scanning it

for viruses), still you can find this document in BSP package

Board Support Packages (29)

L3.14.52_1.1.0_MX6QDLSOLO (REV L3.14.52_1.1.0)

~igor