[FFmpeg-user] What does 'i[0][0][0] 0x0069' after mp3 codec mean?

[Zhang Weiwu]

Newbie. Using ffmpeg 1.2.4. Plenty of googling before asking in the list.

Sometimes the codec mp3 is followed by

U[0][0][0] 0x0055

And sometimes:

i[0][0][0] 0x0069

What does that mean? I am guessing the U/i is an indicator whether or not 
the mp3 stereo is joint-stereo, but 0055 and 0069 is beyond me.

Example command output (read its last line please)

$ ffmpeg -i *..avi -c copy /dev/null
ffmpeg version 1.2.4 Copyright (c) 2000-2013 the FFmpeg developers
   built on Nov 29 2013 21:37:41 with gcc 4.6 (Debian 4.6.3-14)
   configuration: --prefix=/usr --extra-cflags='-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -fPIC -DPIC' --extra-ldflags='-Wl,-z,relro' --cc='ccache distcc cc' --enable-shared --enable-libmp3lame --enable-gpl --enable-nonfree --enable-libvorbis --enable-pthreads --enable-libfaac --enable-libxvid --enable-postproc --enable-x11grab --enable-libgsm --enable-libtheora --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-libspeex --enable-nonfree --disable-stripping --enable-libvpx --enable-libschroedinger --disable-encoder=libschroedinger --enable-version3 --enable-libopenjpeg --enable-librtmp --enable-avfilter --enable-libfreetype --enable-libvo-aacenc --disable-decoder=amrnb --enable-libvo-amrwbenc --enable-libaacplus --libdir=/usr/lib/arm-linux-gnueabi --disable-vda --enable-libbluray --enable-libcdio --enable-gnutls --enable-frei0r --enable-openssl --enable-libass --enable-libopus --enable-fontconfig --enable-libpulse --disable-mips32r2 --disa  libavutil      52. 18.100 / 52. 18.100
   libavcodec     54. 92.100 / 54. 92.100
   libavformat    54. 63.104 / 54. 63.104
   libavdevice    54.  3.103 / 54.  3.103
   libavfilter     3. 42.103 /  3. 42.103
   libswscale      2.  2.100 /  2.  2.100
   libswresample   0. 17.102 /  0. 17.102
   libpostproc    52.  2.100 / 52.  2.100
[avi @ 0x14625d0] non-interleaved AVI
[mpeg4 @ 0x1462da0] Invalid and inefficient vfw-avi packed B frames detected
Input #0, avi, from '/var/local/Movies/cache/Cherubini MEDEA (Theodossiou,Dell'Oste,Palacios,Secco)-Dir. M. Latonja-Lisbona 25.1.2005-By Pato B..avi':
   Duration: 02:27:48.92, start: 0.000000, bitrate: 2428 kb/s
     Stream #0:0: Video: mpeg4 (DX50 / 0x30355844), yuv420p, 720x576 [SAR 1:1 DAR 5:4], 25 fps, 25 tbr, 25 tbn, 30k tbc
     Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16p, 128 kb/s