[libav-tools] Interpreting avprobe output

Mathieu Malaterre mathieu.malaterre at gmail.com
Fri Mar 27 09:41:52 CET 2015


Hi,

I am trying to make sense of `avprobe -show_streams` output. For an
MPEG4 file, here is what I have:

$ avprobe -show_streams out.mp4
avprobe version 11.3-6:11.3-1, Copyright (c) 2007-2014 the Libav developers
  built on Mar 13 2015 23:08:20 with gcc 4.9.2 (Debian 4.9.2-10)
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'out.mp4':
[...]
    Stream #0.1(und): Audio: aac, 44100 Hz, stereo, fltp, 192 kb/s (default)
[...]
[streams.stream.1]
index=1
codec_name=aac
codec_long_name=AAC (Advanced Audio Coding)
codec_type=audio
codec_time_base=1/44100
codec_tag_string=mp4a
codec_tag=0x6134706d
sample_rate=44100.000000
channels=2
bits_per_sample=0
avg_frame_rate=0/0
bit_rate=192041.000000
time_base=1/44100
start_time=0.000000
duration=36.037370
nb_frames=1552
[...]


Could someone please let me know why `bits_per_sample` is set to 0 ?
As per documentation (https://libav.org/avprobe.html) `fltp` means
`32bits float`, right ?

Thanks,
-- 
Mathieu


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