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Market Research Group

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Matthew Rodriguez
Matthew Rodriguez

48kbps Mp3(-1 B)

Its a little confusing, and frankly a little odd that amazon requires this. mp3 files can be mpeg1 or mpeg2 or mpeg-2.5 (non standard, but widely supported). For this purpose, the main differences between the versions are bitrate and sample rate. Amazon requires 48kbps (which is supported in all mpeg versions). Next, mpeg-2 only supports sample rates of 22050 Hz, 24000 Hz, and 16000 Hz. So resampling to one of those frequencies should force ffmpeg to MPEG-2 layer 3.

48kbps mp3(-1 B)

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