I tried to post a reply, with just a summary of the audio visual conversion from that, which is more useful to me than the converter in entirety, but I got:

CleanTalk: *** Forbidden. Message seems to be spam.

Is there an open source version of the TSV converter I could use on Linux?

Looking at playVideo():
https://github.com/TinyCircuits/TinyCircuits-TinyTV-ASK4002/blob/master/examples/TinyTV/videoPlayer.ino#L186

The video format appears to be raw video frame followed by raw audio. The video is two bytes per pixel, so what, 5 bits each rgb and one ignored, or what? The audio is 2048 bytes of 8 bit per sample raw mono audio?

It also looks like there is an audio-free version of TSV, as in this blog post: https://tinycircuits.com/blogs/learn/120988679-putting-images-on-your-tinyscreen

But I don't see any header checks to determine what kind of TSV file it is. Just be careful, I guess?