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 82E1440E8A for ; Fri, 31 Dec 2021 19:50:42 +0000 (UTC) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id 7AD3768B075; Fri, 31 Dec 2021 21:50:40 +0200 (EET) Received: from mail.personalprojects.net (mail.personalprojects.net [51.79.67.80]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id A02AE68AC57 for ; Fri, 31 Dec 2021 21:50:34 +0200 (EET) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=personalprojects.net; s=20211201; h=Content-Transfer-Encoding:MIME-Version: Message-Id:Date:Subject:To:From:Sender:Reply-To:Cc:Content-Type:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:In-Reply-To:References:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=F5MbtzdnBfJDcToxBjIHNiIlt2VaRs/VeKm42i6rYcc=; b=gGDlwl7AKRvOJPnbGHvbNcACwS 1/LENJmXw93A178XU7k3lqk7+E6pkAbXz243Grn8cE518w84etg0oRoNEwifLES07vXn9BclFnmSq S1/cDxemLctwXxQdj9M90Gl1mONhxyKIeGKcDqneEweVIB8s4NzpOcrWn6fHuxnm/pYI=; Received: from bras-base-simcon3012w-grc-05-64-231-188-105.dsl.bell.ca ([64.231.188.105] helo=courtney.binaryfoundry.ca) by mail.personalprojects.net with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1n3Nv7-0006Oe-3N for ffmpeg-devel@ffmpeg.org; Fri, 31 Dec 2021 14:50:33 -0500 From: John-Paul Stewart To: ffmpeg-devel@ffmpeg.org Date: Fri, 31 Dec 2021 14:50:17 -0500 Message-Id: <20211231195019.16191-1-jpstewart@personalprojects.net> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Subject: [FFmpeg-devel] [PATCH 0/2] avformat/mvdec: make audio stream conditional 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: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Archived-At: List-Archive: List-Post: Recent discussion on the list led me to realize that libavformat was unconditionally creating an audio stream for all SGI movie format (version 2) files, even when no audio is present in the file. A sample of a movie file with no audio can be found at http://www.personalprojects.net/ffmpeg/silent.movie Unpatched ffmpeg will report an audio stream even though no audio is present. After the following patch no audio stream is reported. SGI movie files with audio are slightly affected by the fact that the audio stream is now allocated after the video stream, changing the order they are listed in the output of ffprobe or ffmpeg. I don't think this materially affects anything. All existing FATE tests pass. Incidentally, the silent.movie sample above is at 25fps and can also be used by anyone who wants to double-check the earlier patch 3c9ffbd009 that reads and sets the framerate. The sample file is only about 88 KB. _______________________________________________ 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".