From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ffbox0-bg.mplayerhq.hu (ffbox0-bg.ffmpeg.org [79.124.17.100]) by master.gitmailbox.com (Postfix) with ESMTP id A165043C9D for ; Thu, 4 Aug 2022 13:57:36 +0000 (UTC) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id C64FA68B9E4; Thu, 4 Aug 2022 16:57:34 +0300 (EEST) Received: from nef.ens.fr (nef2.ens.fr [129.199.96.40]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id 5DEE668B9C2 for ; Thu, 4 Aug 2022 16:57:28 +0300 (EEST) X-ENS-nef-client: 129.199.129.80 ( name = phare.normalesup.org ) Received: from phare.normalesup.org (phare.normalesup.org [129.199.129.80]) by nef.ens.fr (8.14.4/1.01.28121999) with ESMTP id 274DvR8J008108 for ; Thu, 4 Aug 2022 15:57:27 +0200 Received: by phare.normalesup.org (Postfix, from userid 1001) id 4F711EB5BC; Thu, 4 Aug 2022 15:57:27 +0200 (CEST) Date: Thu, 4 Aug 2022 15:57:27 +0200 From: Nicolas George To: FFmpeg development discussions and patches Message-ID: References: <20220802165421.137563-1-george@nsup.org> <20220804134924.GJ2088045@pb2> MIME-Version: 1.0 In-Reply-To: <20220804134924.GJ2088045@pb2> X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.4.3 (nef.ens.fr [129.199.96.32]); Thu, 04 Aug 2022 15:57:27 +0200 (CEST) Subject: Re: [FFmpeg-devel] [PATCH 1/7] lavu/pixfmt: summarize yuv naming conventions X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches Content-Type: multipart/mixed; boundary="===============7541309208513717111==" Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Archived-At: List-Archive: List-Post: --===============7541309208513717111== Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="Gn4VxiDFmoOho9Hq" Content-Disposition: inline --Gn4VxiDFmoOho9Hq Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Michael Niedermayer (12022-08-04): > You seem to describe samples as rectangular areas of constant value IIUC. > If you look at the ITU/ISO specs (mpeg2, h264 or others) they are describ= ed > by point samples. The desity of samples matches. While the default locati= ons > do not. > What you list above are where probably most sane people would place the > samples. But ISO/ITU, probably because of historic TV standard reasons and > interlacing convertion reasons place the chroma samples in a more crooked= way > I think either the ascii art should be adapted or the text should clarify > this difference I am not sure what exactly you explain. The picture represents memory cells and how we think of them when we implement generic functions, for example cropping or drawutils. Do we need to fix all this code somehow? Regards, --=20 Nicolas George --Gn4VxiDFmoOho9Hq Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEE6ooRQGBoNzw0KnwPcZVLI8pNxgwFAmLr0EQACgkQcZVLI8pN xgxkOBAAmHufG8xkigXQ94KNrwJLt3W3Oh6p4/YKMFkLD3KLUwPJwkJ6WwBcvxsw oBAUbeP7SP5tRUE7RgteF/+i26HAtC5V8NixIcWwQtXn9mCwPV/Ig/1IDkmrSlGL YBJ09oEeglC8ePgcxwsEDkaxOHkVVkgBMo9V6NhLHeJgIcea0kwynAHXSQRO5c1Y iwhz40hgcUG/5MZaFYKBEzXAnJG8/UHMWSt85QqD4+idJzz6GBUOthvYhvul9Bda fi6iFtIPrb+uxGz/+JYOlXEA8JkqgXBLhYnnCj7v+/KM+CYOTmJdxT5RliJw+Mej 8IsO1zzQS1MkFMZBr+nDcJUXAM43jUEQl79VzHu7BEYS8xmmqAub2pzMqbegzfQA 4tEQaCSZXiFQ0ONh4hbQwLvgDLI4x68pTYiUKQVyskE8JyAzUl1WGEbVZ28yEaVu 0dCI8FXF+/aBiEL4zE07/Qno8WHgp0TGGAuHkjaOezIpZc+5NCBVmQh4eOdQIm5j KWaiAovJfef99FnLchfxT9yen1wzplpq0ddxB9DaxJd0lniORFHCBKraQ71BpJrM 7Xu3PgLWOGZVnnOIWnnSGd6YPlASkhYlJvuE62s4kiePlYsN5pmKQRIzHFNNGOMH yLuCvvPKdeHV4udZDr5XGNLPtB5LRgf73TnrHHxVIQTHXR+k3bA= =prZr -----END PGP SIGNATURE----- --Gn4VxiDFmoOho9Hq-- --===============7541309208513717111== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe". --===============7541309208513717111==--