Ovideon AVIAh - Manual (Page 58)

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Other Functions If the transcoded moving picture quality is not
acceptable, click the "Configure" command
button after video codec selectionand set the
bitrate(kbps) higher than normal and start
encoding. This will allow for better quality
moving pictures.
If the transcoded moving picture quality is not
acceptable, set the resolution higher than normal,
which will allow for better quality moving pictures.
Note: Resolution may differ according to Codec, so
if you encode higher than the compatible resolution,
it will not run in AVIAh (e.g., in the case of Xvid,
resolution should not be higher than 720x480.)