Since every clip will get an effect – the source codec no longer matters, as long as the Preview files and output codecs match. But today that almost never happens: at the very least, every clips gets a little color correction. An example would be XDCam originals, edited (no effects) and then output to XDCam. Technically, Premiere has the capability of doing this type of file copy when sources are untouched and merely edited (shortened) and output to the same codec. When you create high-quality Previews with the same codec as your output codec, Adobe Premiere Pro intelligently speeds up your workflow: instead of recompressing your media, Premiere Pro copies the already computed Previews into the output file. This is key in fast turnaround workflows. Using high-quality Previews for export, removes the need to recalculate the encoding, at a negligible impact on quality. By default, the source footage and effects are compressed to the final output codec, transforming media as little as possible. Premiere Pro and Adobe Media Encoder do a great job of preserving image quality. Generally, whether or not there are previews, when media is exported, it gets re-compressing. If your Preview codec matches your output codec, your export time can shrink from minutes to seconds.
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