27 Feb
2010
27 Feb
'10
2:55 a.m.
bitrate, this may be inaccurate
Input #0, aac, from 'sample.aac': Duration: 00:01:12.37, bitrate: 0 kb/s Stream #0.0: Audio: aac, 8000 Hz, 1 channels, s16, 0 kb/s [vorbis @ 0xf84250]Current FFmpeg Vorbis encoder only supports 2 channels.
That's your problem. FFmpeg's native Vorbis encoder doesn't support mono. It's not the AAC sample. I would recommend using -acodec libvorbis instead. If you really want to use the native encoder, maybe adding -ac 2 would work to convert it to stereo.
-Justin
Yes you are right. I used another codec to compress to and it worked Thanks