Capabilities
As it is built from the same code as MPlayer, it can read from every source which MPlayer can read, decode all media which MPlayer can decode and it supports all filters which MPlayer can use. MPlayer can also be used to view the output of most of the filters (or of a whole pipeline of filters) before running MEncoder. If the system is not able to process this in realtime, audio can be disabled using -nosound to allow a smooth review of the video filtering results.
It is possible to copy audio and/or video unmodified into the output file to avoid quality loss because of re-encoding. For example, to modify only the audio or only the video, or to put the audio/video data unmodified into a different container format.
Since it uses the same code as MPlayer, it features the same huge number of highly-configurable video and audio filters to transform the video and audio stream. Filters include Cropping, Scaling, Vertical Flipping, horizontal mirroring, expanding to create letterboxes, rotating, brightness/contrast, changing the aspect ratio, colorspace conversion, hue/saturation, color-specific Gamma correction, filters for reducting the visibility of compression artifacts caused by MPEG compression (deblocking, deringing), automatic brightness/contrast enhancement (autolevel), sharpness/blur, denoising filters, several ways of deinterlacing, and reversing telecine.
Read more about this topic: MEncoder
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