blocks|key|251169|text|您必须应用矩阵变换，如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|251170|if(isFrontCamera)+{
++++m.preScale(-ratio,+ratio);
}+else+{
++++m.preScale(ratio,+ratio);
}|code-block|syntax|javascript|251171|假设你不调整任何东西的大小，比例将是1，这将使非前置摄像头preScale过时。|251172|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

You have to apply a matrix transformation, like such: 

<pre><code>if(isFrontCamera) {
 m.preScale(-ratio, ratio);
} else {
 m.preScale(ratio, ratio);
}
</code></pre>

Assuming you don't resize anything the ration would be 1, making the non-front camera preScale obsolete.

blocks|key|251230|text|在我的例子中，我只需要在玩它的时候水平翻转。当录制时，它已经翻转为镜像效果，正如我所见，这是不可能修改它。然而，下面的代码解决了我在玩游戏时的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|251231|videoPlayer.setScaleX(-1);|code-block|syntax|javascript|251232|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

In my case, I just need to horizontal-flip when playing it. When recording it's already flipped for mirror effect and as I see it's not possible to modify it. However below code solved my problem when playing.
<pre><code>videoPlayer.setScaleX(-1);
</code></pre>

blocks|key|34893|text|如果您需要翻转视频记录并将其保存到内部存储中，那么您可以使用android+studio中的Mp4Composer依赖。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|34894|首先，您需要添加依赖项，|34895|步骤1.将JitPack存储库添加到构建文件中|34896|allprojects+{
++++repositories+{
++++++++...
++++++++maven+{+url+'https://jitpack.io'+}
++++}
}|code-block|syntax|javascript|34897|步骤2.添加依赖项|34898|dependencies+{
++++++++implementation+'com.github.MasayukiSuda:Mp4Composer-android:v0.4.1'
}|34899|下面是与垂直翻转相同的示例代码。你可以通过生成flipVertical(true)来翻转它。你也可以通过flipHorizontal(true)水平翻转它。|offset|length|style|CODE|34900|private+void+flipVideo(String+path,+String+destinationPath)+{
++++++++new+Mp4Composer(sourcePath,+destinationPath)
++++++++.size(1280,+720)
++++++++.fillMode(FillMode.PRESERVE_ASPECT_FIT)
++++++++//.flipHorizontal(true)
++++++++.flipVertical(true)
++++++++//+.rotation(Rotation.ROTATION_270)
++++++++//.filter(glFilter)
++++++++//.mute(muteCheckBox.isChecked())
++++++++//.timeScale(2f)
++++++++//.changePitch(false)
++++++++//.trim(2000,+5000)
++++++++.listener(new+Mp4Composer.Listener()+{
++++++++++++@Override
++++++++++++public+void+onProgress(double+progress)+{
++++++++++++++++Log.d("app_log",+"onProgress+=+"+%2B+progress);
++++++++++++++++runOnUiThread(()+->+progressBar.setProgress((int)+(progress+*+100)));
++++++++++++}

++++++++++++@Override
++++++++++++public+void+onCompleted()+{
++++++++++++++++Log.d("app_log",+"onCompleted():+video+conversion+completed");
+++++++++++++++runOnUiThread(()+->+{
+++++++++++++++++++Toast.makeText(CameraActivity.this,+"video+saved+under+"+%2B+destinationPath,+Toast.LENGTH_SHORT).show();
+++++++++++++++});
++++++++++++}

++++++++++++@Override
++++++++++++public+void+onCanceled()+{
++++++++++++}

++++++++++++@Override
++++++++++++public+void+onCurrentWrittenVideoTime(long+timeUs)+{
++++++++++++}

++++++++++++@Override
++++++++++++public+void+onFailed(Exception+exception)+{
++++++++++++++++Log.e("app_log",+"onFailed()+"+%2B+exception.getMessage());
++++++++++++}
++++++++})
++++++++.start();
++++}|34901|像这样调用这个方法，|34902|flipVideo(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS)+%2B+"/video_input.mp4",+Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS)+%2B+"/video_output.mp4");|34903|更多信息：Mp4Composer-android|34904|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/codemaker2015/Mp4Composer-android^0|0|0|0|0|0|0|N|I|1G|K|0|0|0|0|5|J|0|0^^$0|@$1|2|3|4|5|6|7|1A|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1B|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|1C|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|1D|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|1E|8|@]|9|@]|A|$]]|$1|M|3|N|5|H|7|1F|8|@]|9|@]|A|$I|J]]|$1|O|3|P|5|6|7|1G|8|@$Q|1H|R|1I|S|T]|$Q|1J|R|1K|S|T]]|9|@]|A|$]]|$1|U|3|V|5|H|7|1L|8|@]|9|@]|A|$I|J]]|$1|W|3|X|5|6|7|1M|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|H|7|1N|8|@]|9|@]|A|$I|J]]|$1|10|3|11|5|6|7|1O|8|@]|9|@$Q|1P|R|1Q|1|1R]]|A|$]]|$1|12|3|-4|5|6|7|1S|8|@]|9|@]|A|$]]]|13|$14|$5|15|16|17|A|$18|19]]]]

If you need to flip the video recording and save it into internal storage then you can use the Mp4Composer dependency in android studio.
First you need to add the dependency,
Step 1. Add the JitPack repository to your build file
<pre><code>allprojects {
 repositories {
 ...
 maven { url 'https://jitpack.io' }
 }
}
</code></pre>
Step 2. Add the dependency
<pre><code>dependencies {
 implementation 'com.github.MasayukiSuda:Mp4Composer-android:v0.4.1'
}
</code></pre>
The following is a sample code for the same with vertical flip. You can flip it by making <code>flipVertical(true)</code>. Also you can flip it horizontally by <code>flipHorizontal(true)</code>.
<pre><code>private void flipVideo(String path, String destinationPath) {
 new Mp4Composer(sourcePath, destinationPath)
 .size(1280, 720)
 .fillMode(FillMode.PRESERVE_ASPECT_FIT)
 //.flipHorizontal(true)
 .flipVertical(true)
 // .rotation(Rotation.ROTATION_270)
 //.filter(glFilter)
 //.mute(muteCheckBox.isChecked())
 //.timeScale(2f)
 //.changePitch(false)
 //.trim(2000, 5000)
 .listener(new Mp4Composer.Listener() {
 @Override
 public void onProgress(double progress) {
 Log.d(&quot;app_log&quot;, &quot;onProgress = &quot; + progress);
 runOnUiThread(() -&gt; progressBar.setProgress((int) (progress * 100)));
 }

 @Override
 public void onCompleted() {
 Log.d(&quot;app_log&quot;, &quot;onCompleted(): video conversion completed&quot;);
 runOnUiThread(() -&gt; {
 Toast.makeText(CameraActivity.this, &quot;video saved under &quot; + destinationPath, Toast.LENGTH_SHORT).show();
 });
 }

 @Override
 public void onCanceled() {
 }

 @Override
 public void onCurrentWrittenVideoTime(long timeUs) {
 }

 @Override
 public void onFailed(Exception exception) {
 Log.e(&quot;app_log&quot;, &quot;onFailed() &quot; + exception.getMessage());
 }
 })
 .start();
 }
</code></pre>
Call the method like this,
<pre><code>flipVideo(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS) + &quot;/video_input.mp4&quot;, Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS) + &quot;/video_output.mp4&quot;);
</code></pre>
For more: <a href="https://github.com/codemaker2015/Mp4Composer-android" rel="nofollow noreferrer">Mp4Composer-android</a>

I'm trying to record a video from Android's front camera while displaying on surface view as well. 

What I found out with the front camera is that it mirror flips the video during recording, even though the surface view shows a normal view.

Is there any way I can prevent this or fix it?

I read upon other stackoverflow articles like <a href="https://stackoverflow.com/questions/10388789/how-to-keep-android-from-inverting-the-image-from-the-front-facing-camera/17570037#17570037">How to keep android from inverting the image from the front facing camera?</a>

But it seems to be only talking about taking photos with the front camera and reversing the image, which I already fixed using matrix myself. However, it seems like using a matrix for a video does not work.

Android flip front camera mirror flipped video

Android

我正在尝试从Android的前置摄像头录制视频，同时也在表面视图上显示。我发现前置摄像头在录制过程中会镜像翻转视频，即使表面视图显示的是正常视图。我有什么方法可以防止或修复它吗？我读过像这样的stackoverflow文章但它似乎只是在谈论用前置摄像头拍照和反转图像，我已经用矩阵修复了这一点。然而，似乎使用矩阵来表示视...

问Android翻转前置摄像头反转视频
EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问Android翻转前置摄像头反转视频EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问Android翻转前置摄像头反转视频
EN