1)CMTimeMake(1,10)
表示1秒的持续时间和10或10帧/秒的时标.这意味着1帧视频的持续时间为10帧?
2)
CMTime lastTime=CMTimeMake(1,10);
CMTime frameTime=CMTimeMake(1, 10);
CMTime currentTime=CMTimeAdd(lastTime, frameTime)
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=(2,10)?
2秒的视频和每秒10帧的当前时间?
Class<? extends Something>
这是我的解释,它是班级模板但课程?表示类的名称未确定,它扩展了Something类.
如果我的解释有问题,请告诉我.
我尝试了以下两种方法来附加UIImage
s pixelbuffer ASSETWriterInput
.除了视频文件中没有数据外,一切看起来都不错.怎么了?
AVAssetWriterInputPixelBufferAdaptor * avAdaptor = [AVAssetWriterInputPixelBufferAdaptor assetWriterInputPixelBufferAdaptorWithAssetWriterInput:writerInput sourcePixelBufferAttributes:NULL];
[avAdaptor appendPixelBufferixelBuffer withPresentationTime:CMTimeMake(1, 10)];
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// Create sample buffer.
CMSampleBufferRef sampleBuffer = NULL;
result = CMSampleBufferCreateForImageBuffer(kCFAllocatorDef ault, pixelBuffer, true, NULL, NULL, videoInfo, &timing, &sampleBuffer);
// Ship out the frame.
NSParameterAssert(CMSampleBufferDataIsReady(sample Buffer));
NSParameterAssert([writerInput isReadyForMoreMediaData]);
BOOL success = [writerInput appendSampleBuffer:sampleBuffer];
Run Code Online (Sandbox Code Playgroud) 我有两个路径,我希望Xcode搜索标题:
"/ myproject/lib1/include"
"/ myproject/lib2/include"
在Xcode的用户标题搜索路径中添加这两个路径的正确语法是什么?我试过"/ myproject/lib1/include";"/ myproject/lib2/include"
但它没有用.它抱怨找不到object1.h.object1在/ myproject/lib1/include里面
我已经将整个/ myproject/lib1/include文件夹和/ myproject/lib2/include文件夹添加到目标项目中.
我有一个像这样的功能
__android_log_print(ANDROID_LOG_INFO, "HelloNDK!");
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在我的C代码上
我在LogCat上找不到那个输出.我需要设置什么样的过滤器
通过Log Tag,Log Message,Application Name,Log Level ...等.
我会制作缩小尺寸的视频,可能是50像素,75像素长.这些是物理方面.
你怎么设置的?在视频设计?我认为AVVideoWidthKey和AVVideoHeightKey更适用于我需要的物理尺寸分辨率.
NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:
AVVideoCodecH264, AVVideoCodecKey,
[NSNumber numberWithInt: 320], AVVideoWidthKey,
[NSNumber numberWithInt:480], AVVideoHeightKey,
nil];
AVAssetWriterInput* writerInput = [[AVAssetWriterInput
assetWriterInputWithMediaType:AVMediaTypeVideo
outputSettings:videoSettings] retain
Run Code Online (Sandbox Code Playgroud) 我从Png文件中获取UIImage并将其提供给videoWriter.
avAdaptor appendPixelBuffer:pixelBuffer
当最终结果视频出来时,它似乎缺少一种颜色,缺少黄色或其他东西.
我采用了使像素缓冲区脱离UIImage的功能
CVPixelBufferCreateWithBytes(NULL,
myWidth,
myHeight,
kCVPixelFormatType_32BGRA,
(void*)CFDataGetBytePtr(image),
CGImageGetBytesPerRow(cgImage),
NULL,
0,
NULL,
&pixelBuffer);
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我也尝试了kCVPixelFormatType_32AGRB和其他人,它没有帮助.
有什么想法吗?
我希望启动图像开始并保持3秒钟,然后消失并继续或替换为main.xml中的其余布局.
这是我的代码:
Main.java
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);
ImageView splash = (ImageView) this.findViewById(R.id.splash);
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main.xml中
<?xml version="1.0" encoding="utf-8"?>
<!-- margin=0px, padding=20px -->
<!--textview padding=10dp, textSize=16sp-->
<!--px=pixel, dp=density indepen sp=scale indepen fontsize preference -->
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ImageView
android:id="@+id/splash"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:src="@drawable/splash2"/>
<ImageView
android:id="@+id/myImageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/bg_main"/>
<ImageView
android:id="@+id/myImageView0"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/bar_top"/>
<!--
<TextView android:id="@+id/textItem"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:paddingTop="10dp"
android:paddingLeft="110dp"
android:background="#00000000"
android:textColor="#ffffffff"
android:textSize="22sp"
android:text="Find Car"
android:enabled="false"
>
-->
<TabHost android:id="@android:id/tabhost"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<RelativeLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="3dp">
<FrameLayout …
Run Code Online (Sandbox Code Playgroud) 以下代码将图像视图从右向左移动一次,但我想继续进行.向右移动到左边然后再向左移动并再次从右向左重复.
imageview=[[UIImageView alloc] initWithFrame:CGRectMake(320, 200, 2635, 200)];
image=[UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"animal" ofType:@"png"]];
[imageview setImage:image];
[self.view addSubview:imageview];
[UIView beginAnimations:@"MoveAndStrech" context:nil];
[UIView setAnimationDuration:40]; //30
[UIView setAnimationBeginsFromCurrentState:YES];
CGPoint p, b, a, c, d,e;
p.x = 0;
p.y = 200;
imageview.center=p;
[UIView commitAnimations];
Run Code Online (Sandbox Code Playgroud) #ifndef INT64_C
#define INT64_C(c) (c ## LL)
#define UINT64_C(c) (c ## ULL)
#endif
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##在C中意味着什么?这是占位符还是功能?