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 DE0D747F43 for ; Wed, 6 Dec 2023 19:36:20 +0000 (UTC) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id 7879A68C9F8; Wed, 6 Dec 2023 21:36:17 +0200 (EET) Received: from mail0.khirnov.net (red.khirnov.net [176.97.15.12]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id 2281668C482 for ; Wed, 6 Dec 2023 21:36:11 +0200 (EET) Received: from localhost (localhost [IPv6:::1]) by mail0.khirnov.net (Postfix) with ESMTP id C1CC22405ED for ; Wed, 6 Dec 2023 20:36:10 +0100 (CET) Received: from mail0.khirnov.net ([IPv6:::1]) by localhost (mail0.khirnov.net [IPv6:::1]) (amavis, port 10024) with ESMTP id hZWCZWOBvDf5 for ; Wed, 6 Dec 2023 20:36:10 +0100 (CET) Received: from lain.khirnov.net (lain.khirnov.net [IPv6:2001:67c:1138:4306::3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "lain.khirnov.net", Issuer "smtp.khirnov.net SMTP CA" (verified OK)) by mail0.khirnov.net (Postfix) with ESMTPS id 206F72400AC for ; Wed, 6 Dec 2023 20:36:10 +0100 (CET) Received: by lain.khirnov.net (Postfix, from userid 1000) id F407B1601B9; Wed, 6 Dec 2023 20:36:09 +0100 (CET) From: Anton Khirnov To: FFmpeg development discussions and patches In-Reply-To: <9a6f5c0-35b8-b424-1fc-591ecd618e73@passwd.hu> References: <20231206103002.30084-1-anton@khirnov.net> <9a6f5c0-35b8-b424-1fc-591ecd618e73@passwd.hu> Mail-Followup-To: FFmpeg development discussions and patches Date: Wed, 06 Dec 2023 20:36:09 +0100 Message-ID: <170189136997.1197.12625006990874818639@lain.khirnov.net> User-Agent: alot/0.8.1 MIME-Version: 1.0 Subject: Re: [FFmpeg-devel] [PATCH v3] ffmpeg CLI multithreading 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: Quoting Marton Balint (2023-12-06 20:29:01) > > > On Wed, 6 Dec 2023, Anton Khirnov wrote: > > > Hi, > > this should hopefully be the last version of this set. If nobody has new > > comments, I will push it in a few days. > > In some cases the performance penalty because of threading is quite > significant: > > Example command line: > > ffmpeg -f lavfi -i sine -af volume=6dB -f null none > > After latest threading changes: speed=810x > Before latest threading changes: speed=1.13e+03x > With 6.0 branch: speed=1.43e+03x > With 5.1 branch: speed=2.92e+03x > > This is a significant decline from 5.1, getting slower with each > release... Is there anything that can be done about this? Would guess this is caused by overhead from tons of tiny frames. So 1) generate larger frames 2) use -filter_complex with no inputs instead of -f lavfi to eliminate all overhead from demuxing, decoding, and demux-decode/decode-filter inter-thread communication -- Anton Khirnov _______________________________________________ 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".