pre-configurated of output dimensions on ffmpeg

Some pre-configurations of output dimensions on ffmpeg.

ffmpeg -i source.ext -r 1 -s 4cif -f image2 img%5d.jpg

This will produce you pictures with 704 width * 576 height

sqcif 128×96 qcif 176×144 cif 352×288
4cif 704×576 qqvga 160×120 qvga 320×240
vga 640×480 svga 800×600 xga 1024×768
uxga 1600×1200 qxga 2048×1536 sxga 1280×1024
qsxga 2560×2048 hsxga 5120×4096 wvga 852×480
wxga 1366×768 wsxga 1600×1024 wuxga 1920×1200
woxga 2560×1600 wqsxga 3200×2048 wquxga 3840×2400
whsxga 6400×4096 whuxga 7680×4800 cga 320×200
hd480 852×480 hd720 1280×720 hd1080 1920×1080

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