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letterbox - bitrate
Does letterboxing add to bitrate requirements assuming a constant visual quality?
For example, let's assume that we have a 512x288 source.
Using common codecs such as xvid, x264, wmv3:
1) Encode to 512x288 output at 1000 kbps.
2) Letterbox (not resize, just add black borders) the source to 1024x576. Encode at 1000 kbps.
I suppose the second one will have exactly the same visual quality, since the black borders are constant throughout the video. The information in the first frame (for black borders) will be replicated for the remaining frames without extra bitrate requirement.
Is this correct?
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