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RM_VIDEO10
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vbrBitrate
Variable bit rate stream based on the audience's avgBitrate and maxBitrate settings. The video stream quality value is ignored. This is the standard setting for most variable bit rate clips. RealProducer may encode certain sections at speeds up to the maxBitrate setting, but attempts to encode an overall bit rate consistent with the avgBitrate value. The resulting average rate may be somewhat higher than the avgBitrate value, however. The vbrUnconstrainedBitrate encoding type generally encodes very close to the specified average bit rate, but has an unconstrained maximum bit rate.
vbrQuality
Variable bit rate stream based on the audience's maxBitrate setting and the video stream's quality setting. The audience's avgBitrate setting is ignored. Use this value if you want to try to maintain the encoding quality at a certain level and it is not necessary to maintain a consistent, average bit rate. The quality level may be constrained by the maximum bit rate, however, particularly during fast-action scenes.
vbrUnconstrainedQuality
Variable bit rate stream based on the video stream's quality setting. The audience's avgBitrate and maxBitrate values are ignored. Use this value to maintain the encoding quality at a certain level when it is not necessary to maintain a consistent, average bit rate or adhere to a maximum bit rate. This is the only setting allowed for the RealAudio lossless codec.
vbrUnconstrainedBitrate
Variable bit rate stream based on the audience's avgBitrate setting. The audience maxBitrate property and video stream quality setting are ignored. The resulting file may therefore have large bandwidth spikes, but the average bit rate will be close to the avgBitrate value. This is a better choice than vbrBitrate for creating a download clip at a specific file size. The final size will be the avgBitrate setting multiplied by the clip timeline. For example, a 60-second clip with an average bit rate of 450 Kbps is approximately 27,000 Kbits, or 3.3 Megabytes.
