What is the meaning of frame rate in AudioFormat?
For PCM, A-law and μ-law data, a frame is all data that belongs to one sampling intervall. This means that the frame rate is the same as the sample rate. For compressed formats like Ogg Vorbis, mp3 and GSM 06.10, the situation is different. A frame is a block of data as it is output by the encoder. Often, these blocks contain the information for several sampling intervalls. For instance, a mp3 frame represents about 24 ms. So the frame rate is about 40 Hz. However, the sample rate of the original is preserved even inside the frames and is correctly restored after decoding.
