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| 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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