On Tue, Sep 29, 2020 at 10:26:20AM -0400, Mark Filipak (ffmpeg) wrote: > 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? > > > > Now, I'm not talking about streams. I'm talking about after > > > decoding. I'm talking about the buffers. I would think that a > > > single, consistent format would be used. > > There is no single consistent format used internally. See Gyan's answer > > here: > > http://ffmpeg.org/pipermail/ffmpeg-user/2020-September/050031.html > > And thanks for that. So, ffmpeg really is a Tower of Babel, eh? That does > not seem wise to me. That seems like a great way to generate bugs in > addition to confusion.
Now if that is not trolling out of pure ignorance I dunno what is. I'm really asking mysefl why are there still people feeding this poor troll. > > Now, I imagine that converting to a lingua franca would blow up processing > time, so it isn't done. However, if there are format-to-format regular > expressions for conversions, may I suggest that those regular expressions be > published? Also, if Y Cb & Cr are separate buffers, may I suggest that > ffmpeg publish that? > > In school, I learned that inputs and outputs should be fully characterized, > not suggested, not implied, but fully characterized as structures. That > takes time, and it takes review and perfection by informed people, but that > time is worth the investment. > > -- > The U.S. political problem? Amateurs are doing the street fighting. > The Princeps Senatus and the Tribunus Plebis need their own armies. > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
