What is the best format to convert MP3 to Video? (Trying to upload audio to Youtube).

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Try these output formats: MP4 and MOV are the best choices for the majority of social media.

Another side note: Supported file formats for uploads include FLAC, M4A, MP3, OGG, and WMA. You will see a progress bar indicating your music is uploading and a confirmation message once the songs have been uploaded. Your uploaded music may take some time to show up in your library, even after it has been successfully uploaded.