The English-language patch of Mother 3 crackles heavily on the main menu screen, making it easy to test with, even though the core can run at approximately 700 FPS in fast-forward mode. The issue seems to have nothing to do with the core's CPU utilization. The crackle is less severe in Windows, and latency can be lowered a bit compared to Linux, but remains in excess of two frames (32 ms minimum from light testing). I have reproduced this behavior on Linux Mint 19 and Windows 10 on the same machine. Most of the audio isn't this bad, but these same patterns persist. Additionally, two sections of audio seem to be "spliced" at 27.780-it seems that the audio was abruptly time-shifted without dropping to zero at all. Sometimes the signal appears to have been momentarily "paused", and resumes at the same level it stopped at, but other times it skips either ahead or behind to a completely different level, as if the second chunk of audio has been "time shifted". Most of the time, the audio simply "drops out" for a short, but varying length of time. It affects the left and right channels at the same time. This particularly unlucky run of audio samples shows the full breadth of known failure modes. The distorted audio, however, can be captured with Audacity by monitoring an audio output (e.g. This issue does not affect recorded "video dumps", which contain perfect audio at the emulated system's native sample rate, indicating that the core's output is not at issue here. 20 ms is usually sufficient for most cores, but all mGBA games tested exhibit this audio crackle to some extent at the same latency. Mother 3, running on mGBA, usually requires 48 ms minimum but on occasion has required latencies in excess of 80 ms. The threshold varies by core and by content, and is not always consistent across repeated runs. The audio output from Retroarch is heavily distorted unless the audio latency is set strangely high. Audio output from the core in use must be buffered for some length of time to accomplish this, inducing latency however, a buffer of only a few milliseconds should be sufficient for cores which are not very demanding on the hardware in use. The audio is imperceptibly time-stretched to sync with the video and resampled to the desired output sample frequency without distortion. The audio output from Retroarch sounds the same as on the original console, unless the core is unable to run at full speed. This is most prominent by far in mGBA out of all cores tested, but can be reproduced in other cores as well (albeit at lower audio latencies). To do so, right-click on the playlist section on the left of Retroarch’s desktop frontend and choose New Playlist from the menu that pops up.Highly audible "pops" and "crackles" occur while a core is running, and can only be remedied by raising the audio latency to excessive levels. Thankfully, thanks to Retroarch’s new desktop frontend, you can create and populate playlists manually in seconds. After what could be hours of waiting, you will still have an empty list in front of you. For example, good luck trying to automatically scan a folder filled with games for Sony’s first PlayStation in compressed PBP format. Does your collection span multiple systems with large ROMs (like the Playstation, Gamecube, or anything newer)? In such scenarios, this “scanning” can eat up your whole evening.Īn additional problem is that Retroarch can’t recognize many popular formats, even if its own cores support them. Unfortunately, when dealing with extensive ROM collections, scanning a directory filled with ROMs to detect the games automatically can take a lot of time. That, though, defeats its very purpose, to be a frontend for hundreds of games on different systems. Retroarch’s game detection and playlist update features are great if you are using it to play around a dozen ROMs. With High performance selected, your CPU will stop unnecessarily throttling your games. Go to “Windows Control Panel -> Power Options,” then change the “Preferred plan” to “High performance.” This option may be hiding under “Show additional plans,” which you may have to click to see it. No matter which graphical settings you change, the game suffers a “dragging” effect on both video and sound that makes it extremely unpleasant to play.Īfter much poking around and futile settings tweaks, we found the solution in the simplest of places – Windows Power Options. These two issues often go hand in hand, and you may have experienced them in particular on some of the more demanding cores like the Vulkan-based PS1 core Beetle PSX HW. It will work with the Vulkan driver (using very accurate if low-resolution N64 graphics). Next, quit Retroarch and reopen it, go to “Settings -> Drivers -> Video” and change the driver to “vulkan.” Now, open a ROM using the ParaLLel 64 core.
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