My brother and I have been going at it on if a YouTube channel puts out a video, based around a conversation with either a static image or a simple eye catch behind it, can it be considered a podcast? I'm of the opinion that a podcast is a podcast because it's an audio file, in an aggregator, that can be downloaded to a portable device with minimal fuss. He's of the opinion that the content makes a podcast, and if all podcast aggregators suddenly go under, any audio files with album art uploaded to YouTube would be considered indistinguishable from podcasts, so podcasts can live exclusively in the YouTube space and still be considered a podcast.
Does anyone else have a take on this? Can I use Tildes to definitively prove my brother wrong?