[MEncoder-users] -oac copy and -of lavf shows audio data info wrong for flv videos.

[Bill Crockett]

When stream copying avc and aac with an flv container, the clip info of 
the audio data rate is showing completely wrong in Mplayer and 
MediaInfo.  The command line:

mencoder -ovc copy -oac copy -of lavf -lavfopts format=flv -fafmttag 
0x706d infile.flv -o outfile.flv

MEncoder Sherpya-SVN-r33883-4.2.5 (C) 2000-2011 MPlayer Team
163 audio & 369 video codecs
success: format: 0  data: 0x0 - 0x5a2303
libavformat file format detected.
[lavf] stream 0: video (h264), -vid 0
[lavf] stream 1: audio (aac), -aid 0, -alang und
VIDEO:  [H264]  640x360  24bpp  29.970 fps  685.6 kbps (83.7 kbyte/s)
[V] filefmt:44  fourcc:0x34363248  size:640x360  fps:29.970  ftime:=0.0334
** MUXER_LAVF 
*****************************************************************
REMEMBER: MEncoder's libavformat muxing is presently broken and can generate
INCORRECT files in the presence of B-frames. Moreover, due to bugs MPlayer
will play these INCORRECT files as if nothing were wrong!
*******************************************************************************
OK, exit.
videocodec: framecopy (640x360 24bpp fourcc=34363248)
Forcing output audio format tag to 0x706d.
audiocodec: framecopy (format=706d chans=2 rate=44100 bits=16 B/s=11999 
sample-0)
VIDEO CODEC ID: 28
AUDIO CODEC ID: 15002, TAG: 0
Writing header...
[flv @ 0212b280] Codec for stream 0 does not use global headers but 
container format requires global headers
[flv @ 0212b280] Codec for stream 1 does not use global headers but 
container format requires global headers
Pos:  60.0s   1799f (99%)  0.00fps Trem:   0min   5mb  A-V:0.001 [685:95]]
Writing index...

Video stream:  685.595 kbit/s  (85699 B/s)  size: 5144242 bytes  60.027 
secs  1799 frames

Audio stream:   95.995 kbit/s  (11999 B/s)  size: 726375 bytes  60.534 secs
------------------------------------------------------------------------

As you can see, the audio stream is 95 kbit/s.  This is correct and is 
exactly the same as the original.  However, playing with Mplayer - look 
at the audiodatarate - shows this:

Clip info:
  duration: 61
  width: 640
  height: 360
  videodatarate: 781
  framerate: 30
  videocodecid: 7
  audiodatarate: 3
  audiosamplerate: 44100
  audiosamplesize: 16
  stereo: true
  audiocodecid: 10
  encoder: Lavf53.6.0
  filesize: 5951333
Load subtitles in ./

==========================================================================
Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
AUDIO: 44100 Hz, 2 ch, s16le, 3.4 kbit/0.24% (ratio: 421->176400)
Selected audio codec: [ffaac] afm: ffmpeg (FFmpeg AAC (MPEG-2/MPEG-4 Audio))
==========================================================================

The audiodatarate is only showing 3 and 3.4 kbit as shown above.  The 
program MediaInfo confirms this.

Any ideas to correct this really appreciated.