[MEncoder-users] Bug: Mono show 2 channels????

[GeBu]

Thank you very much - it is big help for me. First I encoded video by 
Avidemux (Windows) and I had the same problem, but with every player. So 
I thought that it is problem of Avidemux and tried mencoder (Linux). And 
I got the same by mplayer. I thought that our script is bad. I was 
confused :(. Later I saw that it is ok in VLC and other player. So I did 
not know if the sound is mono or stereo.
My idea was: maybe it is not right to have samplerate 48000 kHz for mono 
and bitrate 64 kbit/s.
BTW: What is optimal parametres (bitrate, samplerate is there any 
relationship between them?) for mono audio (mainly speech) typically 
home video from DV cammera microfon?
Jirka (GeBu)
> The developers may have to correct me on this, but my hunch is that
> mplayer always initializes both right and left channels of output so
> as to support weird codecs such as eAAC+ (AAC + Spectral Band
> Replication (making the high frequencies) and Parametric Stereo
> (making stereo based on the pitch of the sound).  I say this, because
> eAAC+ encoding cannot be found out without decoding at the very least
> 1 frame of audio; thats why if you have ever tuned into a 24k AAC+
> shoutcast with mplayer, it sounds mono / crappy for about half a
> second, then bursts into stereo with higher frequency sound.  The
> player has no idea until that 1 frame is decoded whether or not the
> signal is stereo or mono, so mplayer by default prepares for stereo.
>
> Mike