From owner-freebsd-multimedia@FreeBSD.ORG Sun Nov 6 21:39:05 2005 Return-Path: X-Original-To: freebsd-multimedia@freebsd.org Delivered-To: freebsd-multimedia@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 78EFD16A41F; Sun, 6 Nov 2005 21:39:05 +0000 (GMT) (envelope-from freebsd@sopwith.solgatos.com) Received: from schitzo.solgatos.com (c-67-168-241-176.hsd1.or.comcast.net [67.168.241.176]) by mx1.FreeBSD.org (Postfix) with ESMTP id 1CBF543D48; Sun, 6 Nov 2005 21:39:05 +0000 (GMT) (envelope-from freebsd@sopwith.solgatos.com) Received: from sopwith.solgatos.com (uucp@localhost) by schitzo.solgatos.com (8.11.6/8.11.6) with UUCP id jA6LdCo16752; Sun, 6 Nov 2005 13:39:12 -0800 Received: from localhost by sopwith.solgatos.com (8.8.8/6.24) id VAA10645; Sun, 6 Nov 2005 21:39:06 GMT Message-Id: <200511062139.VAA10645@sopwith.solgatos.com> To: freebsd-multimedia@freebsd.org, freebsd-firewire@freebsd.org Date: Sun, 06 Nov 2005 13:39:06 +0000 From: Dieter Cc: Subject: Sending DV to camcorder over firewire gives dropouts X-BeenThere: freebsd-multimedia@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: freebsd@sopwith.solgatos.com List-Id: Multimedia discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 06 Nov 2005 21:39:05 -0000 AMD64 running FreeBSD 6.0 beta3. Canon DV NTSC camcorder connected via firewire. Playing a tape and recording it on the computer via fwcontrol -R filename.dv appears to work fine. Sending the video back to the camcorder via fwcontrol -S filename.dv mostly works, but every 1.5-2 seconds or so I get a momentary dropout of both video and audio. I get the same dropouts with a dv file created by "fwcontrol -R" and with dv files created by ffmpeg. This is with the camcorder in "VCR" mode, and stopped (not recording). The computer is otherwise idle. The dropouts are very regular and repeatable, so it probably isn't due to an occasional transmission error, or the computer being busy for a moment. Wild Guess Theory #1: fwcontrol -S reports: 3948 frames, 131.50 secs, 30.02 frames/sec 784 frames, 25.92 secs, 30.24 frames/sec 3597 frames, 119.78 secs, 30.03 frames/sec Shouldn't this be 29.97 fps ? Wild Guess Theory #2: Perhaps the flow-control / buffer-management isn't quite right, and the camcorder runs out of data?