MX Player Codec 1.7.20: How to Play All Media Formats on Android
Not all video is made alike. Different formats are encoded in different ways, sometimes even video files of the same format can be encoded using different methods. A video player is simply an engine to decode that video and display it for you, but it needs to know how to decode it, and that's where codecs come in. MX Player Codec for ARMv5 is a codec specifically designed for ARM architecture, meaning you can play your video files without issue on your ARM-based Android device.
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Progressive MP4 is easy to implement but doesn't perform as well in terms of Quality of Experience (as measured by a QoE tool like Mux Data. Just create an MP4 file and let the player download it progressively via range requests. The upside here is simplicity; the downside is that players can't adapt automatically to network conditions. This means viewers with high bandwidth will get lower quality video than they should, while viewers with low (or variable) bandwidth will see rebuffering.