blocks|key|1581784|text|https://doc.qt.io/qt-5/qvideoframe.html#map|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1581785|if+(inputframe.map(QAbstractVideoBuffer::ReadOnly))
{
++++int+height+=+inputframe.height();
++++int+width+=+inputframe.width();
++++uchar*+bits+=+inputframe.bits();
++++//+figure+out+the+inputFormat+and+outputFormat,+they+should+be+QImage::Format
++++QImage+image(bits,+width,+height,+inputFormat);
++++//+do+your+conversion
++++QImage+outImage+=+image.convertToForma(outFormat);+//+blah+convert
++++return+QVideoFrame(outImage);
}|code-block|syntax|javascript|1581786|entityMap|0|LINK|mutability|MUTABLE|url^0|0|17|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|F|7|T|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|4]]]]

<a href="https://doc.qt.io/qt-5/qvideoframe.html#map" rel="nofollow noreferrer">https://doc.qt.io/qt-5/qvideoframe.html#map</a>

<pre><code>if (inputframe.map(QAbstractVideoBuffer::ReadOnly))
{
 int height = inputframe.height();
 int width = inputframe.width();
 uchar* bits = inputframe.bits();
 // figure out the inputFormat and outputFormat, they should be QImage::Format
 QImage image(bits, width, height, inputFormat);
 // do your conversion
 QImage outImage = image.convertToForma(outFormat); // blah convert
 return QVideoFrame(outImage);
}
</code></pre>

blocks|key|505888|text|我找到了一个内置在Qt5中的解决方案，但是Qt不支持。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|505889|以下是如何进行：|505890|将QT+%2B=+multimedia-private放入qmake+.pro文件中|ordered-list-item|CODE|505891|将#include+"private/qvideoframe_p.h"放入您的代码中，以使函数可用。|505892|您现在可以访问具有以下签名的函数：QImage+qt_imageFromVideoFrame(const+QVideoFrame+&frame);|505893|使用该函数将QVideoFrame转换为临时QImage，然后从该映像创建输出QVideoFrame。|505894|下面是我的示例用法：|505895|QVideoFrame+convertFormat(const+QVideoFrame+&inputframe,+QVideoFrame::PixelFormat+outputFormat)
++++{
++++++++inputframe->map(QAbstractVideoBuffer::ReadOnly);
++++++++QImage+tempImage=qt_imageFromVideoFrame(inputframe);
++++++++inputframe->unmap();
++++++++QVideoFrame+outputFrame=QVideoFrame(tempImage);
++++++++return+outputFrame;
++++}|code-block|syntax|javascript|505896|同样，从标题复制的警告如下：|505897|/W/它纯粹是作为//实现细节存在的。此头文件可能在没有通知的情况下从版本更改为//版本，甚至可以被删除。/我们是认真的。//|blockquote|505898|这在我的项目中并不重要，因为它是个人玩具产品。如果情况变得严重，我将跟踪该函数的实现，并将其复制到我的项目或其他项目中。|505899|entityMap^0|Q|1|0|0|8|0|0|14|1|O|0|0|1E|1|Y|0|0|21|H|1K|0|0|1F|6|B|M|6|13|B|0|0|A|0|0|0|E|0|0|1R|0|0|1O|0^^$0|@$1|2|3|4|5|6|7|17|8|@$9|18|A|19|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1A|8|@$9|1B|A|1C|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|1D|8|@$9|1E|A|1F|B|C]|$9|1G|A|1H|B|K]]|D|@]|E|$]]|$1|L|3|M|5|J|7|1I|8|@$9|1J|A|1K|B|C]|$9|1L|A|1M|B|K]]|D|@]|E|$]]|$1|N|3|O|5|J|7|1N|8|@$9|1O|A|1P|B|C]|$9|1Q|A|1R|B|K]]|D|@]|E|$]]|$1|P|3|Q|5|J|7|1S|8|@$9|1T|A|1U|B|C]|$9|1V|A|1W|B|K]|$9|1X|A|1Y|B|K]|$9|1Z|A|20|B|K]]|D|@]|E|$]]|$1|R|3|S|5|6|7|21|8|@$9|22|A|23|B|C]]|D|@]|E|$]]|$1|T|3|U|5|V|7|24|8|@]|D|@]|E|$W|X]]|$1|Y|3|Z|5|6|7|25|8|@$9|26|A|27|B|C]]|D|@]|E|$]]|$1|10|3|11|5|12|7|28|8|@$9|29|A|2A|B|C]]|D|@]|E|$]]|$1|13|3|14|5|6|7|2B|8|@$9|2C|A|2D|B|C]]|D|@]|E|$]]|$1|15|3|-4|5|6|7|2E|8|@]|D|@]|E|$]]]|16|$]]

I found a solution that is built into Qt5, but UNSUPPORTED BY Qt.

Here is how to go about:

<ol>
<li>Put <code>QT += multimedia-private</code> into your qmake .pro file</li>
<li>Put <code>#include "private/qvideoframe_p.h"</code> into your code to make the function available.</li>
<li>You now have access to a function with the following signature: <code>QImage qt_imageFromVideoFrame(const QVideoFrame &amp;frame);</code></li>
<li>Use the function to convert the <code>QVideoFrame</code> to a temporay <code>QImage</code> and then create the output <code>QVideoFrame</code> from that image.</li>
</ol>

Here is my example usage:

<pre><code>QVideoFrame convertFormat(const QVideoFrame &amp;inputframe, QVideoFrame::PixelFormat outputFormat)
 {
 inputframe-&gt;map(QAbstractVideoBuffer::ReadOnly);
 QImage tempImage=qt_imageFromVideoFrame(inputframe);
 inputframe-&gt;unmap();
 QVideoFrame outputFrame=QVideoFrame(tempImage);
 return outputFrame;
 }
</code></pre>

Again, the warning copied from the header reads as follows:

<blockquote>
<pre><code>//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
</code></pre>
</blockquote>

This does not matter in my project since it is a personal toy product. If it ever gets serious I will just track down the implementation of that function and copy it into my project or something.

blocks|key|1584763|text|我在the+linked+comment中找到了一个YUV+->+RGB转换解决方案，|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1584764|因此，实现supportedPixelFormats函数(如下面的示例所示)将甚至基于YUV的格式(在我的示例中，它将Format_YUV420P格式转换为Format_RGB24格式)具有魔力：|style|BOLD|1584765|QList<QVideoFrame::PixelFormat>MyVideoSurface::
supportedPixelFormats(QAbstractVideoBuffer::HandleType+handleType)+const
{
++++Q_UNUSED(handleType);
++++return+QList<QVideoFrame::PixelFormat>()
++++++++<<+QVideoFrame::Format_RGB24
++++;
}|code-block|syntax|javascript|1584766|告诉我这对你有用吗。|1584767|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/27829830/convert-qvideoframe-to-qimage#comment49984060_27830041^0|2|I|0|0|5|L|17|6|26|C|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|6|7|10|8|@$A|11|B|12|F|G]|$A|13|B|14|F|G]|$A|15|B|16|F|G]]|9|@]|C|$]]|$1|H|3|I|5|J|7|17|8|@]|9|@]|C|$K|L]]|$1|M|3|N|5|6|7|18|8|@]|9|@]|C|$]]|$1|O|3|-4|5|6|7|19|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]]]

I've found a YUV --> RGB conversion solution in <a href="https://stackoverflow.com/questions/27829830/convert-qvideoframe-to-qimage#comment49984060_27830041">the linked comment</a>,

So Implementing the supportedPixelFormats function like the following example does the magic of converting even YUV based formats (in my case, it converted a Format_YUV420P format) into the Format_RGB24 format:

<pre><code>QList&lt;QVideoFrame::PixelFormat&gt;MyVideoSurface::
supportedPixelFormats(QAbstractVideoBuffer::HandleType handleType) const
{
 Q_UNUSED(handleType);
 return QList&lt;QVideoFrame::PixelFormat&gt;()
 &lt;&lt; QVideoFrame::Format_RGB24
 ;
}
</code></pre>

Tell me if it worked for you.

I receive <code>QVideoFrames</code> from webcam, and they contain image data in YUV format (<code>QVideoFrame::Format_YUV420P</code>). How can I convert one such frame to one with <code>QVideoFrame::Format_ARGB32</code> or <code>QVideoFrame::Format_RGBA32</code>?

Can I do it without going low level, using just existing functionality in Qt5?

Example:

<pre><code>QVideoFrame convertFormat(const QVideoFrame &amp;inputframe, QVideoFrame::PixelFormat outputFormat)
{
 // What comes here?
}

//Usage
QVideoFrame converted = convertFormat(mySourceFrame, QVideoFrame::Format_RGB32);
</code></pre>

How to convert 'QVideoFrame' with YUV data to 'QVideoframe' with RGBA32 data in Qt?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我从网络摄像头接收QVideoFrames，它们包含YUV format (QVideoFrame::Format_YUV420P)格式的图像数据。如何将这样的帧转换为QVideoFrame::Format_ARGB32或QVideoFrame::Format_RGBA32的帧？我可以不使用Qt5中现有的功能，而不进行...

问如何在Qt中将YUV数据的“QVideoframe”转换为RGBA32数据的“QVideoframe”？
EN

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问如何在Qt中将YUV数据的“QVideoframe”转换为RGBA32数据的“QVideoframe”？EN