Minimize the effect if you do so by choosing a higher destination bit-rate than the source bit-rate Hence, it isn't recommended to do such conversions unless absolutely necessary.
When you encode (transcode) from one lossy format to another, most of those psychoacoustically redundant bits are already gone, so the transcoding quality will suffer and may even be "hearable" in the result. This means that they achieve their compression in great part by throwing away bits of audio information that are imperceptible to the human ear (called psychoacoustics ) Warning: Both MP3 and OGG are lossy formats, unlike say WAV or FLAC. to OGG because the result may sound poor!
Be careful with conversions from MP3, M4A, etc.
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