Re: [Audacity-devel] Bug 311 - slow export from ogg to all formats

[Christoph <cr...@u-...>]

On 19.03.2011 03:06, Erik de Castro Lopo wrote:
> Benjamin Drung wrote:
> 
>> An explanation would be a problem with seeking. If sndfile decodes the
>> file from the beginning till the seeking point, the speed will decrease
>> the higher the seeking point is.
> 
> What version of libsndfile? 
> 
> libsndfile has been able to seek (without decoding from the
> start) in Ogg/Vorbis files since 2007. If this is not working
> its a bug. If you can provide me with a reproducable test case
> I will fix it.
> 
> Erik

Well, after reading and reproducing bug #311 I just felt that ppl are
missing something:

"Bug 311 - slow export from ogg to all formats"
Wrong. - It's not the ogg export that is broken, it's the ogg import. And
an ogg track is slow not just on export.

I used oggenc to encode a 13min file (30s) where audacity took minutes.
Both resulting ogg files are the same (checked md5sum)

Now import both, the flac and the ogg into the same project,
now try any filter (eg. normalize) on the tracks. U will see, that
filtering the ogg track is much slower then filtering the flac track!

chris