101 lines
3.1 KiB
PHP
101 lines
3.1 KiB
PHP
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<?php
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namespace app\common;
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class Video {
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/**
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* 图片合成视频
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*
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* @param array $images
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* @return string
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* @throws \Exception
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*/
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static public function compositing(array $images) {
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if (empty($images)) {
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throw new \Exception('图片列表不能为空');
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}
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// 设置视频参数
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$width = 800;
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$height = 600; // 4:3 比例
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$frameRate = 30; // 调整帧率为30fps，使动画更流畅
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// 创建临时文件夹
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$tempDir = ROOT_PATH . DS . 'runtime' . DS . 'video_temp';
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if (!is_dir($tempDir)) {
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mkdir($tempDir, 0777, true);
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}
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// 生成唯一的输出文件名
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$outputFile = $tempDir . DS . uniqid() . '.mp4';
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// 准备图片列表文件
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$listFile = $tempDir . DS . uniqid() . '.txt';
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$content = '';
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// 生成临时图片序列目录
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$tempImagesDir = $tempDir . DS . uniqid();
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if (!is_dir($tempImagesDir)) {
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mkdir($tempImagesDir, 0777, true);
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}
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// 处理每张图片，生成临时文件
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$tempImages = [];
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foreach ($images as $index => $image) {
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if (!file_exists($image)) {
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throw new \Exception('图片不存在：' . $image);
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}
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$tempImage = $tempImagesDir . DS . sprintf('%04d.jpg', $index);
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copy($image, $tempImage);
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$tempImages[] = $tempImage;
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}
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// 构建 FFmpeg 命令
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$filterComplex = [];
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// 处理所有输入流的格式和缩放
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foreach ($tempImages as $i => $image) {
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$filterComplex[] = sprintf('[%d:v]format=yuv420p,scale=%d:%d:force_original_aspect_ratio=decrease,pad=%d:%d:(ow-iw)/2:(oh-ih)/2[v%d]',
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$i, $width, $height, $width, $height, $i);
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}
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// 构建转场效果链
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$lastOutput = 'v0';
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for ($i = 1; $i < count($tempImages); $i++) {
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$filterComplex[] = sprintf('[%s][v%d]xfade=transition=fade:duration=1:offset=%d[fade%d]',
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$lastOutput, $i, ($i * 3) - 1, $i);
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$lastOutput = sprintf('fade%d', $i);
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}
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$inputFiles = '';
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foreach ($tempImages as $image) {
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$inputFiles .= sprintf('-loop 1 -t %d -i "%s" ', count($tempImages) * 3, $image);
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}
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$duration = count($tempImages) * 3 - (count($tempImages) - 1); // 总时长计算
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$cmd = sprintf(
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'ffmpeg5 %s -filter_complex "%s" -map "[%s]" -t %d -c:v libx264 -pix_fmt yuv420p -r %d "%s" 2>&1',
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$inputFiles,
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implode(';', $filterComplex),
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$lastOutput,
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$duration,
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$frameRate,
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$outputFile
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);
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// 执行命令
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exec($cmd, $output, $returnCode);
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// 清理临时文件
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array_map('unlink', glob($tempImagesDir . DS . '*'));
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rmdir($tempImagesDir);
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if ($returnCode !== 0) {
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throw new \Exception('视频生成失败：' . implode("\n", $output));
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}
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return $outputFile;
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}
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}
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