Friends who have a certain experience in playing MP3 portable will occasionally encounter such a situation, which is some MP3 files with higher sampling frequencies that cannot be played, and not all MP3 players support 320kbps sampling frequencies, general 224kbps is a limit. The reason for this is the reason for the decoding chip performance limit. When the VCD specification is established, the 224 kbps audio stream has become the standard of VCD, and many MP3 decoding chips are simplified from the VCD decoding chip, nature is naturally affected. Chain.
Everyone may ask that since VBR is a variable bit rate, is it suitable? Nice, VBR is a coding method used in popular CD Ripper applications. VBR and constant bit rate (CBR) encoding are different, which can provide better, harmonious uniform audio quality. However, the file with VBR encoding is generally larger than the CBR encoded file, and only a few machines can perfectly support VBR, which is not good to play the sound quality, but time calculation. Because VBR determines the length of time according to the MP3 file size, VBR can change, this algorithm can no longer get the correct song, what is the time calculation? Quickly refuse to find the correct position. Although there are some machines that can better support VBR, but it is not possible to support the data code rate of 224kbps or more. When you encounter the pattern rate of more than 224kbps, there will be noise.
Under this circumstance, we only choose a suitable data rate, the media carrier of the MP3 player has two: discs and flash. Because the disc capacity is large, it is convenient to replace, there is no need for a file size, and the data rate of 256 kbps or more can be used as long as there is no data rate problem. The MP3 player using flash is carrier, otherwise, it needs to consider the problem, the general flicker MP3 memory is 64M or 128M, we can use the formula to calculate the play time, with a 64M store 256kbps MP3 as an example: 64 × 1024 ÷ (256 ÷ 8) = 2048, that is, 64M can only store 2048 seconds of music, replace it with 192kbps, you can store 2730 second music, there is no more than one CD disc. Time, if you change to 128kbps, although you can store more than one CD music, it is poor, so we still recommend using 192kbps.
In addition, the encoder cannot be ignored, and Lame is a relatively common encoder, and the two versions of 3.90 and 3.92 are said to be the best coding quality.
Finally, I will introduce you to the software used by various format files to MP3:
WMA - MP3: Advanced WMA Workshop, Power MP3 WMA Convertor, Audio Convertion
RM - MP3: Streambox Ripper V2.009, EO Video
ASF - MP3: EO VIDEO
WAV - MP3: LAME is more common
MP2 - MP3: AUDIOCONVERT
VCD - MP3: VCDCutter
DVD - MP3: DVD2AVI
SWF - MP3: SWIFT EXTRACTOR, SWIFT AXE MX, STW Flash Elf 2002 MX, SWF2SND.
APE - MP3: MONKEY's Audio
