Downmix input from stereo to mono (has no effect on non-stereo streams). Useful for lower-bitrate encoding.

Set bitrate management mode. This turns off the normal VBR encoding, but allows hard or soft bitrate constraints to be enforced by the encoder. This mode can be slower, and may also be lower quality. It is primarily useful for streaming.

Audio band width (in Hz) to which an encoder should limit the audio signal. Use 0 to let encoder decide

Bit rate of the encoded data data. Use 0 for variable rate or unknown bit rates. Encoding is set to the bitrate closest to specified value (in bps)

Number of channels

Sets maximum bitrate (in bps).

Sets minimum bitrate (in bps).

port that this structure applies to

Sets encoding quality to n, between -1 (low) and 10 (high). In the default mode of operation, teh quality level is 3. Normal quality range is 0 - 10.

Sampling rate of the source data. Use 0 for variable or unknown sampling rate.

size of the structure in bytes

OMX specification version information