php应用程序中的FFMPEG缩略图没有正确旋转 [英] FFMPEG thumbnail in php application's is not rotated properly

问题描述

我在php应用程序中创建了一个FFMPEG缩略图，并尝试旋转缩略图，如果视频是从底部（反向），但图像旋转不能正常工作。
以下是图像旋转的代码

I have created a FFMPEG thumbnail in a php application and tried to rotate the thumbnail image if the video is bottom up(reversed).But the image rotate is not working properly. The below is the code for image rotation

$video = $storeHere.$mediaFile;
                                $tImage = $upload_output['uploaded_file'].'.jpg';
                                $thumbnail = $storeHere.$tImage;
                                // shell command [highly simplified, please don't run it plain on your script!]
                                 shell_exec("ffmpeg -i $video -deinterlace -an -ss 1 -t 00:00:01 -r 1 -y -vcodec mjpeg -f mjpeg -s 250x250  $thumbnail 2>&1");
                                 /* image rotate fix */
                                    $source = imagecreatefromjpeg($thumbnail);
                                    $degrees = 270;
                                    $rotate = imagerotate($source, $degrees, 0);
                                    imagejpeg($rotate,$thumbnail);
                                 /* rotate fix ends */

推荐答案

HI我找到了这个解决方案，

HI I have found the solution for this one,

 shell_exec("ffmpeg -i $video -deinterlace -an -ss 1 -t 00:00:01 -r 1 -y -vcodec mjpeg -f mjpeg -s 250x250  $thumbnail 2>&1");
                                 /* image rotate fix *///vignesh
                                  $exif = exif_read_data($thumbnail);
                                   if (!empty($exif['Orientation'])) {
                                    $source = imagecreatefromjpeg($thumbnail);
                                    switch ($exif['Orientation']) {
                                        case 3:
                                            $degrees = 180;
                                            break;
                                        case 6:
                                            $degrees = -90;
                                            break;
                                        case 8:
                                            $degrees = 90;
                                            break;

                                    }
                                    $rotate = imagerotate($source, $degrees, 0);
                                    imagejpeg($rotate,$thumbnail);

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