From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4AEF3C04AA7 for ; Mon, 13 May 2019 22:18:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0F3A0208C3 for ; Mon, 13 May 2019 22:18:23 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="AJtdyoVF" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726427AbfEMWSX (ORCPT ); Mon, 13 May 2019 18:18:23 -0400 Received: from mail-lj1-f182.google.com ([209.85.208.182]:37137 "EHLO mail-lj1-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726327AbfEMWSX (ORCPT ); Mon, 13 May 2019 18:18:23 -0400 Received: by mail-lj1-f182.google.com with SMTP id h19so6040156ljj.4 for ; Mon, 13 May 2019 15:18:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=egMsceEhCwO1oOOUz6JFx9YojlJLHQCMFeGtv6PQrYk=; b=AJtdyoVFpMf/pg5FeHis+tsTIEgdqTZh8fzH8gmc1ZackO3JIcHlem2dw/APuGWqVg x2Ioxj2s3/t7T3bOXh8d6jpI8Xnejoc2VHNckRktGK/hr7zD3N7Z22a3oUgtRfoo1YGm 9AIs7f4TGjXF6PFlNkYBcr1Y/aiPpFx2BzHzCFC7hElhYqbg3P8DUlP8UBq2039aXDQl WgNWK/U3lnq5BmDgHTne7Akz/bSwBwHfIfmdxDos/LUILiqcmxrm0HtqLvURJvMvigv1 Ere4ouYVMDbTIktTQYbW/SlMWdvLOZQTrQwC2fwoLXNUSCKji1jfIYN7nQt7+BekXx9E l7OA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=egMsceEhCwO1oOOUz6JFx9YojlJLHQCMFeGtv6PQrYk=; b=tpT8QfwAw6hImhiLqR/Z6gYZ7sByK0Ean+V1ZwE75ow88S4epwriWABppF5ptaGV/9 ugimUYpMSJez+kKWMP3nbizndZyRPKJ8XAhCEfSA32pkzcBM6pgVknBGV/VaEqedRERI 5bph6Ja+B9uRFv8fkGaTFgBGLBTCAAb4p3L8CU6HHRgr6iu173Um9Apzcc15JBuxZ2dD yi6z031+T1hikatrn9fMO5u37D5CVat71xpIUGNzjG+VmLDtuTkCxeRCfJzWbcPTWK48 On8+1NnQvvpS4Y8PVq01Ag8lYjdGpUxvCII75EzQURV3ILIG4mKfzW9xrJBRXF+WE7/E 0Q4w== X-Gm-Message-State: APjAAAVc2mw3gZNJ3jSG5Hcq/AP7QdLa6Eqb9yKSx7d3EVAmori8a/4J dXi0nkNw4wItW/BVUrPXMH+ynDHwFlV/EkYnuv8/306iPew= X-Google-Smtp-Source: APXvYqwl9wmzZzLI7u/dRGyIdTPOeLv1WGnFpJdduTWCbuFx6PWXXO2dAWh8qQlN60LtQzd07DYe1LXI9K2DuGz4ZH4= X-Received: by 2002:a2e:8041:: with SMTP id p1mr3456787ljg.121.1557785900713; Mon, 13 May 2019 15:18:20 -0700 (PDT) MIME-Version: 1.0 From: Tomasz Borowczyk Date: Tue, 14 May 2019 00:18:31 +0200 Message-ID: Subject: cx231xx with 3 grabbers To: linux-media@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Hello linux-media. I use cx231xx driver with my August Vgb100 USB video grabber. It works great. It automatically detects my device and I can watch the video from analog camera on my Raspberry Pi, and I am very happy about how it works. But there is a catch. I want to connect 3 such cameras to my Raspberry Pi. When there are connected 2 of them, I can watch video from both of them without problems. When there are connected 3 adapters, I can watch the video from all three cameras, but the picture from one of them is flickering and blurring between blue screen and the correct data. And no matter in what order I connect them to the Raspberry, the problem exists always on the same adapter. The same problem exists when I connect the cameras to my laptop running Raspbian desktop. This could suggest that the one adapter is a little defective, but it works okay when there are connected only two adapters, or when it is the only connected. Also when I disconnect it and connect again to USB port, I can see correct image. But when I start to play picture from another camera, and then go back to the "defective" one, it flickers again. How can I find the reason of the problem? Best regards, Tomasz