Below is a table that shows the possible resolutions and framerates for the webcams. On the left, all physical resolutions generated by the webcams are listed; at the top, the various framerates.
If a cell is blank, it means the combination of resolution and framerate is not supported. A green cell means the combination is supported uncompressed; a red cell indicates that combination is only available in compressed mode.
Size | PCA 645/646 & VC010 | PCVC 675/680/690 | PCVC 730/740 | |||||||||||||||||||
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3.75 | 5 | 7.5 | 10 | 12 | 15 | 20 | 24 | 5 | 10 | 15 | 20 | 25 | 30 | 5 | 10 | 15 | 20 | 25 | 30 | |||
sQCIF 128x96 |
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QSIF 160x120 |
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QCIF 176x144 |
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SIF 320x240 |
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CIF 352x288 | ||||||||||||||||||||||
VGA 640x480 |
VGA resolutions are indeed limited to 15 fps: there isn't enough bandwidth available on the USB bus to squeeze through more, even with compression.