Pub Chem notes that magnesium carbonate is listed as a safer chemical by the EPA. In addition to being used for climbing and other sports, magnesium carbonate is widely used as an antacid, an anti-caking agent in food and in personal care products. The main ingredient in chalk is magnesium carbonate, also known as MgCO3· nH2O, it’s an odorless, dry fine or bulky powder. The standard acceptance of chalk use places gym owners and managers in constant reactive mode, which means that in order to implement a successful mitigation strategy, the gym has to stop being reactive and become proactive. While today the use of chalk is considered par for the course, in climbing gyms, chalk presents issues as it gets onto practically every available surface and the airborne particles affect air quality. Not only was the use of chalk to improve grip and keep hands dry considered to be a questionable ethical advantage, it, additionally, builds up on holds and permanently discolors the rock. While its effectiveness at increasing friction was immediately apparent, climbing purists objected to chalk and considered it an ethical dilemma. The father of modern bouldering, John Gill, who had a background in gymnastics, is credited with introducing chalk to climbers at Stone Mountain, Georgia, in 1954. Most gyms implement chalk mitigation strategies, whether it’s a never-ending cleaning and vacuuming circuit, installing a chalk eater, or a state of the art HVAC system. You can select one audio track to convert and optionally include a surround version of the same language (if available).Dealing with chalk dust is something that climbing gyms are entirely too familiar with everywhere there are climbers, there’s chalk. MKV2MP4 does not preserve all audio tracks. Some files (that contain too many ref-frames, 10-bit video or are larger than FullHD) will not play on some devices like the PS3 that don't support these features. MKV2MP4 does not do video downscaling, it is not suited for converting HD videos for playback on (old) devices that don't support HD resolutions (like the iPhone 3G(S)). MKV2MP4 even supports generation of files that play with surround on the AppleTV, which has special requirements. If your file contains a surround sound track you can use MKV2MP4 to generate files that play with perfect 5.1 surround sound on your supporting target device. Most subtitles are fully supported as well (see F.A.Q.). There are also options for automatically adding files to the queue and removing them afterwards for batch handling. Additionally there is a custom mode where you can arbitrarily define how to handle audio conversion. Or you can choose highest speed and the files will still play on most player (notably except iOS devices). You can choose perfect compatibility for files that will play on every MP4 compatible player. MKV2MP4 can convert hundreds of files at once with it easy-to-use queue system and features convenience options for automatically adding many files without any further work. You can choose in the preferences whether you want highest speed for the audio conversion or the highest compatibility.īecause MKV2MP4 just copies the video data into the new container format there is absolutely no loss of quality, the converted files are pixel-perfect copies. MKV2MP4 can convert files so fast because it doesn't re-encode the video data but just copies it into the more compatible MP4 container format. MKV2MP4 is a free app to convert video files in the MKV container format to more compatible MP4 video files.
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