A question regarding stride in YUV buffers

[Neil Young]

Hi,

I'm referring to this documentation

https://gstreamer.freedesktop.org/documentation/additional/design/mediatype-video-raw.html?gi-language=c <https://gstreamer.freedesktop.org/documentation/additional/design/mediatype-video-raw.html?gi-language=c>

Up to now I received namely I420 buffers with a size of 1.5*width/height, as expected default YUV size. 

video/x-raw, format=(string)I420, width=(int)720, height=(int)540, interlace-mode=(string)progressive, multiview-mode=(string)mono, multiview-flags=(GstVideoMultiviewFlagsSet)0:ffffffff:/right-view-first/left-flipped/left-flopped/right-flipped/right-flopped/half-aspect/mixed-mono, pixel-aspect-ratio=(fraction)1/1, chroma-site=(string)jpeg, colorimetry=(string)bt601, framerate=(fraction)0/1;

Frame buffer size is 583200 byte.


Today for the first time I got this:

video/x-raw(memory:VASurface), format=(string)NV12, width=(int)720, height=(int)540, interlace-mode=(string)progressive, multiview-mode=(string)mono, multiview-flags=(GstVideoMultiviewFlagsSet)0:ffffffff:/right-view-first/left-flipped/left-flopped/right-flipped/right-flopped/half-aspect/mixed-mono, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)0/1

with a frame buffer size of 622080 byte, which is cleary more than 1.5 * w * h.

Now I'm wondering, how to understand the values of rstride and pstride in the above document. Could somebody help please?

TIA
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