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Implementing a CBR or VBR encoding mode

The following table summarizes the command-line options that are required to implement a CBR or VBR encoding mode for video content.

Mode Command
One-pass CBR -v_mode 0, -v_bitrate, -v_buffer, –v_quality
Two-pass CBR -v_mode 1, -v_bitrate, -v_buffer, –v_quality
Quality-based VBR
(one-pass)
-v_mode 2, -v_quality
Bit rate-based VBR
(two-pass)
-v_mode 3, -v_bitrate
Peak bit rate-based
VBR (two-pass)
-v_mode 4, -v_bitrate, (-v_peakbitrate and -v_peakbuffer are optional; if you do not specify values, default values are used)

The following table summarizes the command-line options that are required to implement each CBR and VBR mode for audio content.

Mode Command
One-pass CBR -a_mode 0, -a_setting
Two-pass CBR -a_mode 1, -a_setting
Quality-based VBR
(one-pass)
-a_mode 2, -a_setting (the first number represents the target quality; use the format Qvalue)
Bit rate-based VBR
(two-pass)
-a_mode 3, -a_setting
Peak bit rate-based
VBR (two-pass)
-a_mode 4, -a_setting, (-a_peakbitrate and -a_peakbuffer are optional; if you do not specify values, default values are used)

You can mix encoding modes in a session. For example, you can use two-pass CBR encoding for your audio and quality-based VBR encoding for your video.

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