From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from nblzone-211-213.nblnetworks.fi ([83.145.211.213]:46531 "EHLO hillosipuli.retiisi.org.uk" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751324AbaKDXc5 (ORCPT ); Tue, 4 Nov 2014 18:32:57 -0500 Message-ID: <54596226.8040403@iki.fi> Date: Wed, 05 Nov 2014 01:32:54 +0200 From: Sakari Ailus MIME-Version: 1.0 To: Paulo Assis CC: =?UTF-8?Q?R=c3=a9mi_Denis-Courmont?= , Grazvydas Ignotas , Linux Media Mailing List , Laurent Pinchart , Hans Verkuil , Mauro Carvalho Chehab Subject: Re: (bisected) Logitech C920 (uvcvideo) stutters since 3.9 References: <20141102225704.GM3136@valkosipuli.retiisi.org.uk> <20141104115839.GN3136@valkosipuli.retiisi.org.uk> <20141104153650.GO3136@valkosipuli.retiisi.org.uk> In-Reply-To: <20141104153650.GO3136@valkosipuli.retiisi.org.uk> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-media-owner@vger.kernel.org List-ID: Sakari Ailus wrote: > yavta does, for example, print both the monotonic timestamp from the buffer > and the time when the buffer has been dequeued: > > > > $ yavta -c /dev/video0 > > should do it. The first timestamp is the buffer timestamp, and the latter is > the one is taken when the buffer is dequeued (by yavta). Removing the uvcvideo module and loading it again with trace=4096 before capturing, and then kernel log would provide more useful information. -- Sakari Ailus sakari.ailus@iki.fi