How to choose video transition effects for your movies
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AVI is a multimedia container format developed by Microsoft. AVI files can store both audio and video and support multiple streaming audio and video tracks. The filename extension is .avi.
MP4 or MPEG-4 is a multimedia container format used to store video and audio. It can also store subtitles and images and can be streamed over the Internet. The official extension for MPEG-4 is .mp4.
MP4 and AVI are both container formats – wrappers for video, audio, and other streams. The quality of a file depends on the codec that the video stream was compressed with. Both containers can hold video compressed with older codecs like MPEG-4 as well as newer ones like H.264. More recent codecs provide better video quality with the same file size, so it is better to pay attention to the codec than the format.