CODEWITHSUNDEEP
audioffmpeg
Peter Kronenberg
Peter Kronenberg

Reputation: 1306

Understanding the ffmpeg decoder format

Using ffmpeg, I get this output (2 different examples)

Input #0, au, from 'c:\TestFiles\sample.au':
  Duration: 00:02:02.09, start: 0.000000, bitrate: 1411 kb/s
    Stream #0:0: Audio: pcm_s16be ([3][0][0][0] / 0x0003), 44100 Hz, stereo, s16, 1411 kb/s
---
Input #0, wav, from 'c:\TestFiles\sample.wav':
  Metadata:
    encoder         : Lavf57.83.100
  Duration: 00:02:02.09, bitrate: 1411 kb/s
    Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s16, 1411 kb/s

I understand what the pcm_s16be part means, but what is the information that follows that in parenthesis, e.g., ([3][0][0][0] / 0x0003)? I can't find any documentation that explains it

Upvotes: 0

Views: 803

Answers (1)

Gyan
Gyan

Reputation: 93339

[3][0][0][0] / 0x0003 <-- these are codec tags.

The hex value on the right is the raw value as stored (usually little-endian); the format on the left is the literary representation. Usually if it's printable characters, that will be shown e.g. mp4a else the decimal number in square brackets.

Upvotes: 1

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