如何修改TinyMCE 4插入媒体时的默认尺寸（默认300x150）？

Hey there! Let's tackle that default MP4 size issue you're running into. The fix depends a bit on which platform or editor you're using, but here are the most common solutions to adjust that 300x150 default:

Most visual editors (like WordPress's Gutenberg/Classic Editor, or other CMS media tools) have native settings for default media dimensions:

• For WordPress, head to Settings > Media — look for sections labeled "Embed Content" or "Default Video Dimensions". You can directly input your preferred width and height here, then save the changes.
• If you're using a third-party editor like TinyMCE, access its configuration panel and locate parameters like default_video_width and default_video_height to update the values.

If built-in settings don't work or you want more control, a small code snippet can override the default:

• Open your theme's functions.php file (or use a code snippet plugin for safer edits) and add this code:

function custom_default_video_size($html, $url, $attr) {
    // Replace these values with your desired default dimensions
    $target_width = 800;
    $target_height = 450;
    
    // Only adjust if no custom dimensions are already set
    if (!isset($attr['width']) && !isset($attr['height'])) {
        $html = str_replace('width="300"', 'width="'.$target_width.'"', $html);
        $html = str_replace('height="150"', 'height="'.$target_height.'"', $html);
    }
    return $html;
}
add_filter('embed_oembed_html', 'custom_default_video_size', 10, 3);

• Save the changes, and any new MP4 direct links you insert will use your specified default size.

For one-off video tweaks, you can edit the media's HTML directly after insertion:

• Switch your editor to "Text/Code" mode, find the <video> or <iframe> tag for your MP4, and manually update the width and height attributes to your preferred values (e.g., width="800" height="450").

内容的提问来源于stack exchange，提问作者nexgen