[英]Android video crop same like image cropping in java or kotlin
[英]Video cropping w/ Matrix android java
任務是按給定的點(如矩形)裁剪視頻並顯示裁剪后的視頻。
所述代碼可與裁剪所述第一halh視頻的(0,0,videoWidth / 2,videoHeight)。 但是,當我嘗試顯示第二個(videoWidth / 2、0,videoWidth,videoHeight)時, 即顯示了該內容 。
視頻顯示在FrameLayout內部的TextureView上。
該部分不起作用:
private void updateTextureViewSize(int ax, int ay, int bx, int by) {
float scaleX;
float scaleY;
//proportions between screen and frame dimensions
scaleX = mVideoWidth / mDisplayWidth;
scaleY = mVideoHeight / mDisplayHeight;
float scaleRegionW = mVideoWidth / Math.abs(ax - bx);
float scaleRegionH = mVideoHeight / Math.abs(ay - by);
float scaleRegion = scaleRegionW < scaleRegionH ? scaleRegionW : scaleRegionH;
Matrix matrix = new Matrix();
if (scaleX > scaleY) {
matrix.setScale(scaleRegion / scaleY, scaleRegion);
matrix.postTranslate(-ax * (int) scaleRegion / scaleY, -ay * scaleRegion / scaleY);
} else {
matrix.setScale(scaleRegion, scaleRegion / scaleX);
matrix.postTranslate(-ax * scaleRegion / scaleX, -ay * scaleRegion / scaleX);
}
mTextureView.setTransform(matrix);
mTextureView.setLayoutParams(new FrameLayout.LayoutParams((int) mDisplayWidth, (int) mDisplayHeight));
}
答案是由德米特里·亞森科 ( Dmitry Yacenko )找到的。 完整代碼 。
通過給定點 (ax,ay,bx,xy)裁剪視頻的一種簡單方法是:
float scaleX = mDisplayWidth / mVideoWidth, scaleY = mDisplayHeight / mVideoHeight;
//proportions between screen and frame dimensions
float scale = mDisplayHeight / Math.abs(by - ay);
Matrix matrix = new Matrix();
matrix.reset();
matrix.setScale(scale / scaleX, scale / scaleY);
//scaling video
matrix.postTranslate(-scale * ax, -scale * ay);
//move video, so the needed part of it will be displayed properly
mTextureView.setLayoutParams(new FrameLayout.LayoutParams((int) mDisplayWidth, (int) mDisplayHeight));
mTextureView.setTransform(matrix);
//updating the Texture view
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.