What do you know about MP3 format?

If you have experience playing MP3 Walkman, you will occasionally encounter this situation, that is, some MP3 files with high sampling frequencies cannot be played, in addition, not all MP3 players support the sampling frequency of kbps. Generally, 224kbps is the limit. The reason is that the performance limit of the decoder chip is due to the VCD specification, the 224kbps audio stream is the standard of VCD, and many MP3 decoding chips are simplified from the VCD decoding chip, which is naturally bound by it.

You may ask if VBR is a variable bit rate? Yes, VBR is a coding method used in popular CD ripper application software. Different from CBR encoding, VBR provides better, more harmonious, and unified audio quality. However, VBR-encoded files are generally larger than CBR-encoded files, and only a few machines can perfectly support VBR files. Poor performance is not in terms of playback quality, but in terms of time computing. Because the VBR determines the length of time based on the MP3 file size, and the VBR can be changed, this algorithm will no longer be able to obtain the correct length of music. What will happen if the length is not calculated? Fast forward and fast return cannot find the correct position. Although some machines can better support VBR, they cannot support data bit rates larger than 224kbps. When the bit rate exceeds 224kbps in an instant, it will produce a noise.

In this case, we only have to choose a suitable data rate. There are two types of media carriers for the MP3 player: Disc and flash. Because the disk capacity is large and easy to replace, the file size does not matter. As long as there is no data rate problem, you can use a data rate above kbps. If you use an MP3 player with flash memory as the carrier, you do not need to consider the capacity. Generally, the flash-inch MP3 memory is 64 MB or 128 MB. You can use the formula to calculate the playback time, take MP3 with 64 MB Storage of 1024 kbps as an example: 64 × 256 Gb/s (2048 kb8) = 2048, that is, 64 MB can only store 192 seconds of music, instead of kbps, you can store 2730 seconds of music. Neither of these two times has exceeded the playing time of a CD. If you change to 128 Kbps, you can store less than one CD music, however, it has poor listening experience. Therefore, we recommend that you use 192 kbps.

In addition, encoder cannot be ignored. Lame is a common encoder, and 3.90 and 3.92 are said to be the best encoding quality.

Finally, I would like to introduce the software used to convert MP3 files in various formats:

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

MP2--MP3: audioconvert.

VCD--MP3: vcdcutter.

DVD--MP3: dvd2avi

SWF--MP3: swift extractor, swift axe MX, shuosi flash client genie 2002 MX, swf2snd.

APE--MP3: Monkey's audio