Added support for more mp3 files.

References

http://www.mp3-tech.org/programmer/frame_header.html

0xFFFA = MPEG-1 Audio Layer-3 CRC Protected
0xFFFB = MPEG-1 Audio Layer-3 Not protected
0xFFF3 = MPEG-2 Audio Layer-3 CRC Protected
0xFFF2 = MPEG-2 Audio Layer-3 Not protected
0xFFE3 = MPEG-2.5 Audio Layer-3 CRC Protected
0xFFE2 = MPEG-2.5 Audio Layer-3 Not protected

Difference

MPEG-1 Audio Layer-3

Sample rate support

• 32kHz
• 44.1kHz
• 48kHz

How to make

ffmpeg -i <input> -c:a mp3 -ar 44100 -id3v2_version 0 -f mp3 <output>

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MPEG-2 Audio Layer-3

Sample rate support

• 16kHz
• 22.5kHz
• 24kHz

How to make

ffmpeg -i <input> -c:a mp3 -ar 24000 -id3v2_version 0 -f mp3 <output>

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MPEG-2.5 Audio Layer-3

Sample rate support

• 8kHz
• 11.025kHz
• 12kHz

How to make

ffmpeg -i <input> -c:a mp3 -ar 8000 -id3v2_version 0 -f mp3 <output>

Releted issues

#46 (closed)