Am 29.09.2020 um 16:26 schrieb Mark Filipak (ffmpeg):
On 09/29/2020 09:37 AM, Michael Koch wrote:
Am 29.09.2020 um 14:58 schrieb Mark Filipak (ffmpeg):
On 09/29/2020 04:06 AM, Michael Koch wrote:
Am 29.09.2020 um 04:28 schrieb Mark Filipak (ffmpeg):
I just want to understand the frame structures that ffmpeg
creates, and that ffmpeg uses in processing and filtering. Are Y,
Cb, Cr separate buffers? That would be logical. Or are the Y, Cb,
Cr values combined and organized similarly to macroblocks? I've
found some code that supports that. Or are the Y, Cb, Cr values
thrown together, pixel-by-pixel. That would be logical, too.
As far as I understood it, that depends on the pixel format.
For example there are "packed" pixel formats rgb24, bgr24, argb,
rgba, abgr, bgra,rgb48be, rgb48le, bgr48be, bgr48le.
And there are "planar" pixel formats gbrp, bgrp16be, bgrp16le.
Hi Michael,
"Packed" and "planar", eh? What evidence do you have? ...Share the
candy!
As far as I know, this is not described in the official
documentation. You can find it for example here:
https://video.stackexchange.com/questions/16374/ffmpeg-pixel-format-definitions
Thanks for that. It saved me some time. ...So, what does "planar"
mean? What does "packed" mean?
Here is an example for a very small image with 3 x 2 pixels.
In (packed) RGB24 format: RGBRGBRGBRGBRGBRGB
In (planar) GBRP format: GGGGGGBBBBBBRRRRRR
Michael
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