Don't have access to post meta in save_post action - php

Question

So what I've noticed is that if I check for a meta value in my save_post function, it comes as blank, meaning the meta value hasn't actually been entered into the post. Looking at this code for example,
function order_mirror_create($post_id) {
global $post;
if($post->ID == ''){
$pid = $post_id;
} else {
$pid = $post->ID;
}
$videohost = get_post_meta($pid, 'video_provider', true);
if ($videohost == "UploadAnime") {
add_post_meta($pid, 'video_display_order', 1, true);
} else {
add_post_meta($pid, 'video_display_order', $videohost, true);
}
}
$videohost is actually blank, so get_post_meta($pid, 'video_provider', true) does not return the actual value of that meta field because it hasn't been created yet.
So in the code above, the else is always the one that runs, since $videohost is blank. How can I fix this? What action should I use that would run in such a manner that the post meta have already been added to the post.

Answer 1

You should change the following:
if ($videohost == "UploadAnime") {
add_post_meta($pid, 'video_display_order', 1, true);
} else {
add_post_meta($pid, 'video_display_order', $videohost, true);
}
To:
if ($videohost == "UploadAnime") {
update_post_meta($pid, 'video_display_order', 1, true);
} else {
update_post_meta($pid, 'video_display_order', $videohost, true);
}
I find add_post_meta has never really worked for me, whereas update_post_meta does.