Wiki > Main > MasLimitations (compare)
Difference: MasLimitations (r2 vs. r1)
An extended test showed that the MAS MPEG audio decoders seems to not correctly decode all valid MPEG version/ layer/ bitrate combinations. This page is about the details. Problems do exist with MPEG2.5 layer 3 3. and MPEG1 layer 2.
These limitations usually don't affect music playback at all. Usually music does not use MPEG2.5, these low sample frequencies are aimed at speech compression. The MPEG1 layer 2 problems occur at such low bitrates that are practically unusable due to clearly noticeable compression artifacts. Fortunately, VBR compression is not an official part of the layer 2 standard as well.
However, there is one area where the MPEG2.5 limitations may hit - creation of voice files. The voice file size is limited to ~1.5 MB. As there are more and more entries added to voicing, there are 2 options to achieve higher compression:
As soon as the sample frequency is lowered to 12 kHz, the MPEG2.5 playback problems may hit. When frame sizes of >64 kbit/s are used, dropouts occur. To avoid this, use the lame option
* These bitrates are forbidden for layer 2 stereo.
r3 - 05 Oct 2005 - 06:10:00 - JensArnoldRevision r2 - 20 Sep 2005 - 16:31 - JonasHaeggqvist
Revision r1 - 08 Nov 2004 - 07:30 - JensArnold
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