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PN2PPF1CBE88495.INDPRD01.PROD.OUTLOOK.COM (2603:1096:c04:1::18c) by PN2PPF51D96C9B0.INDPRD01.PROD.OUTLOOK.COM (2603:1096:c04:1::595) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8813.21; Wed, 4 Jun 2025 23:14:11 +0000 Received: from PN2PPF1CBE88495.INDPRD01.PROD.OUTLOOK.COM ([fe80::9f58:e643:db9:bf05]) by PN2PPF1CBE88495.INDPRD01.PROD.OUTLOOK.COM ([fe80::9f58:e643:db9:bf05%5]) with mapi id 15.20.8813.018; Wed, 4 Jun 2025 23:14:11 +0000 Message-ID: Date: Thu, 5 Jun 2025 00:14:07 +0100 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] media: v4l2-ctrls: Fix H264 SEPARATE_COLOUR_PLANE check To: Nicolas Dufresne , Mauro Carvalho Chehab , Hans Verkuil , Ezequiel Garcia Cc: "linux-media@vger.kernel.org" , "linux-kernel@vger.kernel.org" References: <20250604143552.2955475-1-james.cowgill@blaize.com> <254309f1c527d782e0c50c425602c94683f395b6.camel@ndufresne.ca> Content-Language: en-US From: James Cowgill In-Reply-To: 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tsnlw00dNHeDDxleY6IyP2-nvHIvMV0t X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.0.736,FMLib:17.12.80.40 definitions=2025-06-04_04,2025-06-03_02,2025-03-28_01 X-Proofpoint-Spam-Reason: orgsafe Hi Nicolas, On 04/06/2025 16:35, Nicolas Dufresne wrote: > Le mercredi 04 juin 2025 à 14:38 +0000, James Cowgill a écrit : >> The `separate_colour_plane_flag` element is only present in the SPS if >> `chroma_format_idc == 3`, so the corresponding flag should be disabled >> whenever that is not the case and not just on profiles where >> `chroma_format_idc` is not present. > > > The fix seems correct indeed. This has no incidence on any current driver, since > there is nothing upstream that supports decoding 4:4:4. Would you mind if we > extend the commit with something such as: > > This prevents invalid flags being passed, though no upstream drivers > currently supports YCbCr 4:4:4 decoding. > > Feel free to to suggest a better edit. It will make stable people (and bot) aware > of the patch priority. I can make the edit while applying. That wording seems fine to me. And yes this patch was just based on me reading the code - it doesn't fix any actual breakage (at least for now). Thanks, James