php截取视频指定帧为图片，
php截取视频指定帧为图片，
截取视频指定帧为图片，php ffmpeg扩展已经完美实现：
$movie = new ffmpeg_movie($video_filePath); $ff_frame = $movie->getFrame(1); $gd_image = $ff_frame->toGDImage(); $img="./test.jpg"; imagejpeg($gd_image, $img); imagedestroy($gd_image);
然而问题来了，智能手机拍摄的视频，由于拍摄方向不同，视频会被旋转，并带上meta信息rotate，当你相对视频截取frame图片的时候，如果有rotate信息的视频，frame也是旋转的，因此你需要将截取的图片相应的旋转。
然后php ffmpeg扩展并无法获知rotation信息(php ffmpeg扩展文档),但可以通过ffmpeg命令行获取：
/usr/local/ffmpeg/bin/ffprobe test.mp4 -show_streams | grep rotate
用php简单封装下如下：
function get_video_orientation($video_path) {
$cmd = "/usr/local/ffmpeg/bin/ffprobe " . $video_path . " -show_streams 2>/dev/null";
$result = shell_exec($cmd);
$orientation = 0;
if(strpos($result, 'TAG:rotate') !== FALSE) {
$result = explode("\n", $result);
foreach($result as $line) {
if(strpos($line, 'TAG:rotate') !== FALSE) {
$stream_info = explode("=", $line);
$orientation = $stream_info[1];
}
}
}
return $orientation;
}使用imagerotate()函数就可以旋转截图：
$movie = new ffmpeg_movie($video_filePath);
$frame = $movie->getFrame(1);
$gd = $frame->toGDImage();
if ($orientation = $this->get_video_orientation($video_filePath)) {
$gd = imagerotate($gd, 360-$orientation, 0);
}
$img="./test.jpg";
imagejpeg($gd, $img);
imagedestroy($gd_image);
最后还有一个麻烦事，不是所有的播放器和浏览器都可对video识别orientation并自动rotate，如果你想对视频进行旋转，可通过ffmpeg命令解决：
/usr/local/ffmpeg/bin/ffmpeg -i input.mp4 -vf 'transpose=3' -metadata:s:v:0 rotate=0
以上就是本文的全部内容，希望对大家学习php程序设计有所帮助。
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