NLE = Non-Linear Editor, something like Adobe AfterEffects, Sony Vegas and a bunch of other video editing tools. Even Avisynth could be an option.
For Avisynth, look for the ReplaceFrame plugin, it allows you to easily export a large number of frames as eg. PNG files, edit them in eg. Photoshop and then have them imported back into the video.
I would also recommend looking at a non-ASS-based solution if you want to do advanced overlay graphics like that, it's just way more work than it's worth, when better tools are available.
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