[Vorbis] Vorbis encoding at half speed

[IHARA Hiroka]

Hello Ross,

The attachment appears at least to me as a valid monaural Vorbis audio.

It says in its header that there is only one audio channel, no stereo 
mapping is in use, and there is only one audio vector per frame.

Actually it does not sound well, in a way that makes me wonder if two 
channels are unexpectedly merged into one... (thus it might sound like 
half-speed)

I guess there is something wrong with the encoder setting you are using, 
or with the original stream to be transcoded.

You might want to supply more pieces of information which you think are 
relevant to the transcoding process (original stream, encoder settings 
and so on).

Regards,

Hiroka

--

Hiroka IHARA

Department of Information and Communication Engineering, The University 
of Tokyo

ihara_h at live.jp

On 2017年01月04日 07:31, Ross Levis wrote:
> I’m using a Windows development component which uses vorbis.dll, ogg.dll, vorbisenc.dll for encoding an Ogg Vorbis file.  It's all working well except for one user occasionally has a 1 hour file appear as 2 hours and it plays at half speed.  It is being converted from stereo to mono before feeding the encoder with a channels=1 configuration.
>
> Here is an example file which will be available for a few weeks.
> http://stationplaylist.com/temp2398/Hour2.ogg
>
> Any ideas why this should occur sometimes but works fine other times?
>
> Ross.
>
>
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