user22216: I have a video file with audio. ffprobe reports two different numbers: Sampling rate and Frame rate. I understand the 48kHz rate--there are 48,000 audio samples every second. What is the other number, and what is a "frame" in this context?
 Audio
 ID                                       : 2
 Format                                   : AAC
 ...
 Sampling rate                            : 48.0 kHz
 Frame rate                               : 46.875 FPS (1024 SPF)


user1871: Audio samples are encapsulated into frames as well. For PCM, the framing is notional, but for DCT-based codecs, it's a basic requirement.
AAC typically bundles 1024 samples per frame, so 1 second of 48000 samples represents 48000/1024 = 46.875 FPS

22216: <p>I have a video file with audio. <code>ffprobe</code> reports two different numbers: Sampling rate and Frame rate. I understand the 48kHz rate--there are 48,000 audio samples every second. What is the other number, and what is a "frame" in this context?</p>

<pre><code> Audio
 ID                                       : 2
 Format                                   : AAC
 ...
 Sampling rate                            : 48.0 kHz
 Frame rate                               : 46.875 FPS (1024 SPF)
</code></pre>
 1871: <p>Audio samples are encapsulated into frames as well. For PCM, the framing is notional, but for DCT-based codecs, it's a basic requirement.</p>

<p>AAC typically bundles 1024 <strong>s</strong>amples <strong>p</strong>er <strong>f</strong>rame, so 1 second of 48000 samples represents 48000/1024 = 46.875 FPS</p>
