I would also say no your project is very welcome and love that you can do photos and videos at once!! Highly looking forward to it being released in future!!
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As another suggestion aside from my other comment it would be cool if we can set individually what each individual photo/video will convert too. Can be for future reworked version of this project. That would help a ton for batch work.
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Also, setup a Liberapay to get the most out of donations. Have the link in your app too somewhere so people can donate/see how much you make/how much more you need with a bar saying how much more is needed.
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A queue feature to queue multiple photos and videos to be converted then add more to the active queue whenever
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A customizeable template feature would be cool too for people who work with specific files a lot. For example setting it to auto convert PNG to JPG, or MP4 TO MP3, etc.