![]() The reason many video cameras use MJPEG is that while it uses more space than AVCHD or H264, it does not use temporal compression, so you can delete a series of frames without affecting the frames you keep. Such codecs tend to be best used for final delivery, since they do not allow lossless editing. they store frames as deltas relative to a past or future keyframe. Many codecs use inter-frame ("temporal") compression, i.e.JPEG (a still picture codec) and H264 (a video codec) are both lossy. This includes pretty much any codec associated with MPEG (which, confusingly, is used to refer to both file formats and codecs), Sorenson, H264 (which is an MPEG4 codec), and Cinepak. You should only use them for final delivery, not for creating files for use in a production pipeline (e.g. These codecs tend to be significantly lossy, especially in terms of dynamic range, introduce artifacts into the image, and are difficult to "scrub" (they're designed to be viewed forwards at normal speed). Some codecs are designed for delivery to end-users and not for editing or compositing.Neither can read FLVs, and Flash can't read MOVs or WMVs. In general, Windows Media Player can read MOVs and QuickTime can read WMVs, but they have a different set of codecs. QuickTime allows you to use some file formats as codecs for videos (e.g. ![]() A file format is a separate thing (just like you can insert a JPEG into different word processor files). ![]() A codec (compressor/decompressor) determines how a sequence is compressed.Oh, and looks like there are NINE things. Eight Things You Need to Know About Video CompressionĬorrections: edits, updates, and corrections May 2012. ![]()
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