Smart TVs only see metadata from MP3 files. Note: on older OS X the column view on a Mac might not show the metadata, but it will show when you select ‘Get Info’ Or use ‘Get Info’ on your Mac, and the extra metadata appears under ‘More Information’ in the popup window. Look in finder on your Mac if you expand the file window in ‘Column or List’ view you'll see all the metadata in the Finder window when you select the file, same on a PC. VLC doesn't render the file again, it just adds the data to it, and it works on computers and smart TVs, you can read the metadata. Fill in the info and click the 'Save Metadata' button. Or you can use the free VLC player > Window > Media Information. Most DAWs can do this easily and allow you to add metadata for the mp3. If you want to then turn the WAV file into an MP3, there's lots of ways to do this.

So Audacity is pristine, no phase alterations or spectral alterations. I then took the original WAV and WAV exported with metadata back into protools, inverted the phase of one of the WAVs and there was perfect cancellation at full volume on my sound system. Then imported into Audacity, added metadata, and exported as a WAV file with the same parameters. Bounced down a mix to a 16 bit 44.1khz WAV file.

You might think that using a free app like Audacity will give you inferior audio quality if you rebounce the original WAV file after adding the metadata, but NO, it is a perfect copy of the original. Note: This also works with AIFF files !! But make sure the project settings for Audacity are 16 bits and 44.1khz, otherwise it will resample the audio and you'll get artifacts from that. Then fill in the form with all the metadata you want to include and export the WAV file as a 16 bit WAV file (CD quality).

Just drag your rendered 16 bit 44.1khz WAV file into Audacity > Edit > Metadata What worked for me and is free and very easy to use is Audacity. Logic Pro X only allows you to add metadata to MP3s, same as Pro Tools. Same with VLC player, which I tried as well, it didn't work even though playing the file in VLC player kept the metadata set using VLC player. If you send the file to a PC or Smart TV the metadata doesn't stick. iTunes is useless for adding metadata to WAV or AIFF files, because it only sticks to the file inside iTunes. I've read lots of blogs where people give advice on adding metadata to WAV files.

Wav tag editor for mac