bitrate kbyte VBR quantizer AAL2 TwinVQQ GQp722Qp1 kbit MySpell codec 48kHz kilobits GQp729Qp1 bitstreams VideoCD VQp32bis DQQPSK QQQundf WAV ADPCM downsampled rate 19200 Succisa 292M HQp263 STBC 1920x1080 GQp711 olma Podpe 44Qc100 DS0 lsb mantissa bitstream 44100 lossy