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Nintendo 3DS
[Release] badapple3ds - Bad Apple PV on 3DS
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<blockquote data-quote="Wolfvak" data-source="post: 8141916" data-attributes="member: 374225"><p>Since there seems to be a lot of confusion regarding what this is, I'll just put it plainly: it's literally Bad Apple! for the 3DS.</p><p></p><p>Why? Because every other system has it, that's why. It's also cool af.</p><p></p><p>What's the monorale thing [USER=432058]@Chromaryu[/USER] talks about? Well, the O3DS is too slow to decode H264/MPEG4 in real time, so we either had to use a different codec altogether, or limit the app to N3DS systems. We ended up doing the former, using the fact it's (almost) a B&W video and run-length encoding to switch a very simple state automaton: it fills X bytes with all-black, then Y bytes with all-white, rinse and repeat for every single frame in the video. It may seem like terrible compression (and it is, when compared to modern codecs like H264/VP9), but it's much better than raw framebuffer dumps - just for reference, the ~1.2GiB framebuffer dump gets encoded down to ~9 MiB, which can be further reduced to ~3MiB if a high compression ratio algorithm is used (LZMA, for example).</p><p>It's just an old idea and simple idea applied to a modern problem, and it can't be done if the video isn't monochrome (well, it can be done but it's not as efficient).</p><p></p><p>Overall, it's mostly an excersice in trading functionality, simplicity and speed.</p></blockquote><p></p>
[QUOTE="Wolfvak, post: 8141916, member: 374225"] Since there seems to be a lot of confusion regarding what this is, I'll just put it plainly: it's literally Bad Apple! for the 3DS. Why? Because every other system has it, that's why. It's also cool af. What's the monorale thing [USER=432058]@Chromaryu[/USER] talks about? Well, the O3DS is too slow to decode H264/MPEG4 in real time, so we either had to use a different codec altogether, or limit the app to N3DS systems. We ended up doing the former, using the fact it's (almost) a B&W video and run-length encoding to switch a very simple state automaton: it fills X bytes with all-black, then Y bytes with all-white, rinse and repeat for every single frame in the video. It may seem like terrible compression (and it is, when compared to modern codecs like H264/VP9), but it's much better than raw framebuffer dumps - just for reference, the ~1.2GiB framebuffer dump gets encoded down to ~9 MiB, which can be further reduced to ~3MiB if a high compression ratio algorithm is used (LZMA, for example). It's just an old idea and simple idea applied to a modern problem, and it can't be done if the video isn't monochrome (well, it can be done but it's not as efficient). Overall, it's mostly an excersice in trading functionality, simplicity and speed. [/QUOTE]
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[Release] badapple3ds - Bad Apple PV on 3DS
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