transcoding stereo to mono

[miskol]

I want to transcode some of my video files(WMV +VMA stereo) to xvid + vorbis ogg mono.

I used channels=1 parameter, but it don't work.

[00000361] stream_out_transcode private debug: creating audio transcoding from fcc=`wma2' to fcc=`vorb'
[00000401] main decoder debug: looking for decoder module: 23 candidates
[00000401] ffmpeg decoder debug: libavcodec initialized (interface 3347968 )
[00000401] ffmpeg decoder debug: ffmpeg codec (Windows Media Audio 2) started
[00000401] main decoder debug: using decoder module "ffmpeg"
[00000402] main encoder debug: looking for encoder module: 6 candidates
[00000402] main encoder debug: using encoder module "vorbis"
[00000418] main private debug: looking for audio filter2 module: 4 candidates
[00000418] audio_format private debug: s16l->fl32, bits per sample: 16
[00000418] main private debug: using audio filter2 module "audio_format"
[00000426] main private debug: looking for audio filter2 module: 4 candidates
[00000402] main encoder debug: removing module "vorbis"
[00000361] stream_out_transcode private debug: number of audio channels for mixing changed, trying to reopen the encoder for mixing 2 to 2 channels
[00000402] main encoder debug: looking for encoder module: 6 candidates
[00000402] main encoder debug: using encoder module "vorbis"
[00000366] main private debug: adding a new input
[00000366] mux_ts private debug: adding input codec=vorb pid=68
[00000366] main private error: cannot add this stream


VLC 0.8.6
Can anybody confirm same problem?