@izaya yeah i would have thought ffmpeg could do that. maybe multiple command lines. at the very least I'd think you could just export everything to still frames, rescale as needed, then compose back into a video.

@2ck What I ended up doing was concatenating and re-encoding all the ones with subtitle tracks while burning them into the video, then concatenating them with the videos without with a stream copy

jank, but functional
x_x