PHP Manual
oggvorbis
Context options

Context options

**OGG/Vorbis tuning options**
Option	Definition	Relevance	Default
pcm_mode	PCM byte encoding used. See constants below.	Read / Write	`OGGVORBIS_PCM_S16_LE`
rate	PCM Sampling rate. Measured in Hz.	Write only	`44100`
bitrate	Vorbis Average Bitrate Encoding / Variable Bitrate Encoding. Measured in bps (ABR) or Quality level (VBR: 0.0 to 1.0). 128000 ABR is rough equal to 0.4 VBR.	Write only	`128000`
channels	Number of PCM channels. 1 == Mono, 2 == Stereo.	Write only	`2`
serialno	Serial Number of stream within file. Must be unique within file. Because of the potential to select a duplicate serial number within a chained file, make efforts to manually assign unique numbers when encoding.	Write only	Random
comments	Associative array of file comments. Will be translated to strtoupper($name) . "=$value". Note: This context option is not available in oggvorbis-0.1	Write only	array('ENCODER' => 'PHP/OggVorbis, http://pear.php.net/oggvorbis')

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