I have had success at creating an RSS feed with enclosures containing episodes of my podcast by simply creating a post and inserting an mp3 file from my media library into it via the robust Add Media functionality of the post editor. However, I have found that the RSS feed created from these posts includes an enclosure for each mp3 file with its length attribute set to zero:
<enclosure url="http://example.com/wp-content/uploads/2020/05/myfile.mp3" length="0" type="audio/mpeg" />
How can I set the length attribute of the enclosure so that it is accurate?
I am not interested in changing the format of my posts, so any plugin-based solution should not require a significantly different workflow when posting.
Answers:
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Method 1
The enclosure tag will implement via the function rss_enclosure. This function has the filter hook rss_enclosure. So you can change the result via this hook.
Here is a longer post about the how-to for audio files, this should help you.
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