Video bit rate is the number of data bits transmitted per unit time of data transfer, we use the general unit that is kbps kilobits per second. Popular understanding is that the sampling rate, the larger the sampling rate per unit time, the higher the accuracy, the more close to the original file handle out.
However, the file size is directly proportional to the sampling rate, so the emphasis on almost all of the encoding format is how to achieve a minimum of distortion with the lowest rate, derived from the around the core cbr (constant bit rate) and vbr (variable code rate), all articles in this respect, but things are not always absolute, for example look for an audio, the higher the rate, the smaller the compression ratio, the smaller the loss of sound quality, the sound quality of the sound source close.
The basic algorithm is: [] rate (kbps) = [] File Size (KB) * 8 / [time] (sec), for example, D5 dish, 4.3G capacity, taking into account the different audio formats, may count for the 600M,
(So that the remaining capacity of 4.3 * 1024-600 = 3803.2M), so the video file should be less than 3.7G, the present embodiment takes the video file capacity 3.446G, video length 100 minutes (6000 seconds)
Calculation Results: rate approximately equal to 4818kbps (3.446 * 1024 * 1024 * 8/6000 = 4817.857).