YUV420P视频裁剪

最新推荐文章于 2023-01-17 17:23:51 发布

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最新推荐文章于 2023-01-17 17:23:51 发布 · 437 阅读

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#ffmpeg

本文介绍了如何利用ffmpeg库对视频进行旋转和剪切操作，重点展示了视频裁剪的代码实现。通过指定裁剪的起始和结束坐标（如(100,100)到(500,500)），可以得到401*401像素的裁剪后视频。作者提到，学习ffmpeg入门得益于雷神的博客帮助。" 120944652,5000057,Java单元测试实践-JUnit4详解,"['单元测试', 'java', 'big data']

yuv420P视频剪切

最近在研究使用ffmpeg库进行视频的旋转和剪切，下面就贴上视频剪切的代码

void clipSize(const uint8_t *buffer, uint8_t *result, const int nWidth, const int nHeight, 
	const int startX, const int startY, const int endX, const int endY)
{
	static int nySize = nWidth * nHeight;
	int k = 0;
	static int nuSize = nySize >> 2;
	static int uvWidth = nWidth >> 1;
	static int uvHeight = nHeight >> 1;
	static int destW = endX - startX + 1;
	static int destH = endY - startY + 1;
	static int destuW = destW >> 1;
	static int destuH = destH >> 1;
	static int startuY = startY >> 1;
	static int startuX = startX >> 1;

	uint8_t *ptr = result;
	for (int i = 0; i < destH; ++i)
	{
		//for (int j = 0; j < destW; ++j)
		//{
			//result[k++] = buffer[(startX + i) * nWidth + j];
			memcpy(ptr, buffer + ((startX + i) * nWidth), destW);
			ptr += destW;
		//}
	}
	uint8_t *temp = (uint8_t *)buffer + nySize;
	for (int i = 0; i < destuH; ++i)
	{
		//for (int j = 0; j <