From patchwork Tue Apr 9 22:07:25 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Thompson X-Patchwork-Id: 12675 Return-Path: X-Original-To: patchwork@ffaux-bg.ffmpeg.org Delivered-To: patchwork@ffaux-bg.ffmpeg.org Received: from ffbox0-bg.mplayerhq.hu (ffbox0-bg.ffmpeg.org [79.124.17.100]) by ffaux.localdomain (Postfix) with ESMTP id 6C587448A83 for ; Wed, 10 Apr 2019 01:07:48 +0300 (EEST) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id 55ACE68ADEB; Wed, 10 Apr 2019 01:07:48 +0300 (EEST) X-Original-To: ffmpeg-devel@ffmpeg.org Delivered-To: ffmpeg-devel@ffmpeg.org Received: from mail-wm1-f44.google.com (mail-wm1-f44.google.com [209.85.128.44]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id D0E5F68AA39 for ; Wed, 10 Apr 2019 01:07:41 +0300 (EEST) Received: by mail-wm1-f44.google.com with SMTP id n25so373956wmk.4 for ; Tue, 09 Apr 2019 15:07:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=jkqxz-net.20150623.gappssmtp.com; s=20150623; h=from:to:subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=4lD2Mcdn5NvCAHCgVWVWf2aAtfUpy2kMEKU3Q69Hai0=; b=HCfMA9fHuQbBHBD95aNrbkkAYBNkECzBrE9RFz5y/gVi4HExauYb8rKow6aybTCohA SmZALdQFGVgFMqTQlnF8ap3+oFgKfA76x4Mbjo65FemkyjMUhkoDu+qrdfXt7ilCOwzm CJDKx6PxnrUPtyB4ta0KAHCHe6TvdXf06n5cGuysmWei6Yl0n0gb4jKo8FTLWhrtkMNQ Hj3zJ7CBBtobHCzhdooNZIKrOY++q2Zw6zvSm67RNr00DdyArsUlxTqZhrlNrtmnhZzB Kuim+LmZ8vq8qZfn2nQngIhGgStONGRD6D3NVYAUNGXWJIPzDifZQXpcEi8qUL1HTsq1 LkXw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=4lD2Mcdn5NvCAHCgVWVWf2aAtfUpy2kMEKU3Q69Hai0=; b=JB+OUQs7bGBATnHofJplZg1cTZSo5EPv8D37kq7yjGpgfDcVA1NZxUv5gcUzE72ai7 SkG49cyqySCLtfS8VjY2jmDdljyw4aueQAJXFT+QLkJZOKblAPEX0Mk4BjyXeZDyAMhB XHJNfOiezd6FRNvuQcKOr0Y7sXKbt83OWSBYZrq1VEKVRc8qaM9wUPLRblPT63sGHvI5 APRsJsgxSMkkS1IFp1Ej7fuXqETQ6VdCZfvL31kFOh+fx5xMlOqD9WPaS7F3Ng04bt5i x3GqjpmpJNxIaxVUL+Sa0Uonpv9eILwgCq3BIOHOf8yVBa1aO9WqHe/tBe0qT0hDXGQV Mjog== X-Gm-Message-State: APjAAAVPlda5CkxmA+m+rqdKWUE5WKhXZJWQiJLBDkR1CrnGv7E/Kjan jVHFRKfpTCc8Jdu9L/T5peP24WMdU2I= X-Google-Smtp-Source: APXvYqyWu7uHAcFvfWkbw+dsHkxiVx1csPiYKAlq8JtgnXcTCFKy79xXtIdOIH06c+/zGIVvGwI+dQ== X-Received: by 2002:a7b:c408:: with SMTP id k8mr337312wmi.69.1554847661089; Tue, 09 Apr 2019 15:07:41 -0700 (PDT) Received: from rywe.jkqxz.net (cpc91242-cmbg18-2-0-cust650.5-4.cable.virginm.net. [82.8.130.139]) by smtp.gmail.com with ESMTPSA id v6sm41224332wrt.56.2019.04.09.15.07.39 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 09 Apr 2019 15:07:40 -0700 (PDT) From: Mark Thompson To: ffmpeg-devel@ffmpeg.org Date: Tue, 9 Apr 2019 23:07:25 +0100 Message-Id: <20190409220730.29311-2-sw@jkqxz.net> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190409220730.29311-1-sw@jkqxz.net> References: <20190409220730.29311-1-sw@jkqxz.net> MIME-Version: 1.0 Subject: [FFmpeg-devel] [PATCH v4 2/7] doc/indevs: Add example using cropping to capture part of a plane X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.20 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 Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" --- doc/indevs.texi | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/doc/indevs.texi b/doc/indevs.texi index 1d5ed65773..a4f0f608d7 100644 --- a/doc/indevs.texi +++ b/doc/indevs.texi @@ -910,6 +910,14 @@ Capture from CRTC ID 42 at 60fps, map the result to VAAPI, convert to NV12 and e ffmpeg -crtc_id 42 -framerate 60 -f kmsgrab -i - -vf 'hwmap=derive_device=vaapi,scale_vaapi=w=1920:h=1080:format=nv12' -c:v h264_vaapi output.mp4 @end example +@item +To capture only part of a plane the output can be cropped - this can be used to capture +a single window, as long as it has a known absolute position. For example, to capture +and encode the middle quarter of a 1920x1080 plane: +@example +ffmpeg -f kmsgrab -i - -vf 'hwmap=derive_device=vaapi,crop=960:540:480:270,scale_vaapi=960:540:nv12' -c:v h264_vaapi output.mp4 +@end example + @end itemize @section lavfi