![]() Simple filtergraphs are configured with the per-stream -filter option (with -vf and -af aliases for video and audio respectively).Ĭomplex filtergraphs are those which cannot be described as simply a linear processing chain applied to one stream. Simple filtergraphs are those that have exactly one input and output, both of the same type. filter scale, -vf scale, and -filter_complex scale through filter switch, or -s through option switch. The switches used for resizing an image are Resizing of an image includes The resizing of an image in FFmpeg can be done by specifying the corresponding switches accordingly. However, a higher image quality can still be obtained from computer graphics image than bitmap image during resizing.ĭuring scaling a digital graphic image, apart from the size of image, some other factors that affecting the image quality must also be considered. Since the media of output usually support rasterised bitmap image only, a computer graphic image is always rasterised into a grid of pixels before being outputted onto the media of output. The property of computer graphics used by vector graphics enables the computer graphic image to be scaled up or down without losing resolution, while this is impossible to be done on bitmap image. Example of vector graphic image format is SVG. A vector graphics is computer graphic image that is made up of polygons and other shapes constructed by connecting lines and curve on specified 2D coordinate points. Examples of bitmap image file formats are JPEG, GIF, and PNG. Raster graphics is a bitmap image that made out of a matrix of small dots, called pixels. ![]() In general, there are types of digital graphic pictures, namely raster graphics and vector graphics. ![]() However, the higher the image resolution, the bigger the image size required. For both the media of output and digital graphic image, the more pixels mean the higher resolution and the better image quality. Since the construction and size of the pixel block depends on the media of output used, the mapping process is usually done by ethe media of output. ![]() Digital graphic pictures on a media of output are presented by mapping the pixel elements of graphic image to the tiny pixel blocks of the media of output. ![]()
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