[Mp4-tech] (no subject)

[zhou huan]

Hi, all:
I have downloaded MPEG 4 reference software and successfully compiled it.
But I could not set the parameter correctly for plain MPEG2 AAC
encoding/decoding mode.
My test audio signal is a mono signal with 16bits, and 44.1kHz sampleing
rate. Following the information on README_usage, my options are:
ENCODE at 64kbit/s:
mp4auenc -m tf -c "-aac_raw -aac_tns" -r 64000  harp.wav -o test.aac
DECODE:
mp4audec -c "-aac_raw" -aaceof  test.aac -o harp64.wav -s 44100 -n <num
channels>
Encoding process looks fine. My problem is whatever <num channels> I set,
the decoding process doesn't work. The reported errors are:
1) for <num channels>=0, 1, and 2: Error: Unanticipated channel;
2) for <num channels>=3, 4, ... 10: Error: DecTfInit: audio data has more
than one channel;
3) for <num channels>=11,12...: Error: Decode: max bit stream frame size too
long.
Could anyone give me an explanation about it? Or pass me the correct command
options? Your help is greatly appreciated.
Regards,
Jove
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