Hey guys, I was thinking of trying to port some Video Codecs to the 3DS, considering people seem to be using MJPEG. In particular I was thinking of writing a more efficient video player, and some maybe a new screen capture program (SD/Wifi). While I have experience in signals and image processing/compression, I've never needed to deal with a video/audio codec before (though I'm planning just going to port it over, so I don't suspect this will be much of a problem). Unfortunately between work, university and Pokemon it may take a few months. So here's the preliminary planning: Does anyone know if this has been attempted before? If anyone has a better starting point that would be awesome. I've looked around, but from what I can tell, we've only done MJPEG. Codec Choice for Video: I want to start out with something that has very low CPU usage for both encoding and decoding video; in particular I was thinking MPEG-1 part 2 for video. Any thoughts on this? I don't readily know of anything else that does this. Codec Choice for Audio: I'm not sure how much CPU we'll have to spare, but atleast for N3DS users, I think we can encode audio. Again, I want to choose something that has very low CPU usage. I'm not sure that the obvious choice, MPEG-1 part 3 Layer II, is best here. Something I'll need to research is the implementations available for these codecs. The two prominent choices being FFMPEG and VLC. I could also look into smaller scale implementations such as http://www.uow.edu.au/~nabg/MPEG/mpeg1.html. When choosing an implementation, I'll also want to keep in mind that the ARM11 should have DSP & SIMD instructions. Do any codecs take advantage of these already? Can any codecs take advantage of these? Another possibility for optimization is using the GPU. I'm not sure how necessary this would be, but if anyone has an educated guess... My 3DS specific knowledge is a bit limited here, but I assume for video capture, it's a matter of SVC backdoor to spawn a kernel11 thread and read from video memory. Anyone have any experience with this? I don't know the the 3DS audio systems well enough to perform capture, but I assume it's a case of hooking dsp or something. Is there any documentation out there on this already? If anyone can give some input, that would be a huge help, thanks!