What are the advantages of compressor and it it even necessary

what are the advantages of compressor and it it even necessary?

Necessary for some and not for others – probably a large majority – who can by with the presets avalaible in FCX.
The users who need Compressor are those who want to control the parameters of the encodes to get the best possible trade-off between file size and quality. Or those who want to do things like standards conversions, complex frame speed changes, better re-scaling capabilities, de-interlacing, re-interlacing, output formats beyond which are available in FCX, chapter markers for DVD and Blu-Ray authoring, batch conversions for multiple purposes through droplets, access to clusters for faster rendering.
Russ

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