Hi,
I have encoded an audio file with neroAacEnc as follows:
+----
$ neroAacEnc -q 0.5 -if matrix.wav -of matrix.m4a
+----
and ffmpeg correctly reports the bitrate of the file as 174 kb/s :
+----
andrew at skamandros~/movies/matrix$ ffmpeg -i matrix.m4a
FFmpeg version SVN-r15563, Copyright (c) 2000-2008 Fabrice Bellard, et
al.
configuration: --prefix=/usr --mandir=/usr/man --disable-debug
--enable-shared --disable-static --enable-postproc --enable-avfilter
--enable-pthreads --enable-libtheora --enable-libvorbis
--enable-swscale --enable-x11grab --enable-libmp3lame --enable-libxvid
--enable-libx264 --enable-libschroedinger --enable-libamr-wb
--enable-libamr-nb --enable-nonfree --enable-gpl
libavutil 49.11. 0 / 49.11. 0
libavcodec 52. 0. 0 / 52. 0. 0
libavformat 52.22. 1 / 52.22. 1
libavdevice 52. 1. 0 / 52. 1. 0
libavfilter 0. 1. 0 / 0. 1. 0
libswscale 0. 6. 1 / 0. 6. 1
libpostproc 51. 2. 0 / 51. 2. 0
built on Oct 5 2008 22:21:48, gcc: 4.2.3
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'matrix.m4a':
Duration: 02:11:20.43, start: 0.000000, bitrate: 174 kb/s
Stream #0.0(und): Audio: aac, 48000 Hz, stereo, s16
Must supply at least one output file
+------
MPlayer however reports the bitrate as 'missing' and defaults to 128
kb/s:
+-------
andrew at skamandros~/movies/matrix$ mplayer matrix.m4a
MPlayer dev-SVN-r27647 (C) 2000-2008 MPlayer Team
CPU: Intel(R) Core(TM)2 CPU T5500 @ 1.66GHz (Family: 6,
Model: 15, Stepping: 2)
CPUflags: MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1
Compiled for x86 CPU with extensions: MMX MMX2 SSE SSE2
Playing matrix.m4a.
libavformat file format detected.
[lavf] Audio stream found, -aid 0
==========================================================================
Opening audio decoder: [faad] AAC (MPEG2/4 Advanced Audio Coding)
FAAD: compressed input bitrate missing, assuming 128kbit/s!
AUDIO: 48000 Hz, 2 ch, s16le, 128.0 kbit/8.33% (ratio: 16000->192000)
Selected audio codec: [faad] afm: faad (FAAD AAC (MPEG-2/MPEG-4 Audio)
decoder)
==========================================================================
AO: [oss] 48000Hz 2ch s16le (2 bytes per sample)
Video: no video
Starting playback...
A: 3.4 (03.3) of 7880.4 ( 2:11:20.4) 2.1%
+-------
I find this a little puzzling and I am curious to know if there is a
way around this?
Andrew
--
Do you think that's air you're breathing?
