AAC with bit rate above 192K has no advantage over MP3, especially MP3 compressed by LAME in VBR mode, just like RMVB format used for film compression, with almost invincible image quality at bit rate of 500-600Kbps (compared with formats such as DIVX/MPG compressed at the same bit rate), which is called the king of low bit rate. However, when the bit rate is above 1000Kbps, the quality of RMVB is not as good as that of movies encoded by Divx/Xvid. No one will use RMVB to encode movies with a bit rate above 1000Kbps, because you will find that RMVB movies with a bit rate of 1000K have no obvious improvement compared with 500K, which is not suitable for high bit rate. ......
So the fact is that AAC is the strongest under 128K, WMA is invincible under 128- 192wma, and MP3 above 192 is the first choice.
Ipod used by the landlord, the sound source is lossless from ape to aac, and the recommended code rate is 128K. If the sound quality is considered, it is recommended to use 320K-MP3 and fixed bit rate CBR. If the CBR file is too large, VBR transcoding will become smaller.
In addition, the conversion is only applicable to the conversion from high bit rate to low bit rate, and this process is irreversible.
Due to the hardware factors of the player, the difference between 192 and 320 may not be reflected on MP3, but the difference between 128 and 192 is still obvious. The landlord can download a hivi audition CD without losing ape, convert it according to different formats and different bit rates, listen to it by himself, and then decide which format and bit rate is the most suitable after considering the file size.