Re: VLC only sees a fraction of Speex wrapped in OGG

Just wanted to update the thread. The problem has been resolved. The
following tools mentioned here (
http://en.flossmanuals.net/ogg-theora/command-line-editing/analysing-ogg/)
were particularly helpful: oggz-validate and oggz-dump.



On Thu, Mar 5, 2015 at 1:35 PM, Tristan Matthews <[email protected]>
wrote:

> Hi,
>
> On Thu, Mar 5, 2015 at 2:18 PM, SellBuy Sammamish <[email protected]>
> wrote:
> > Friends,
> >
> > My name is Igor, I am new to this forum.
> >
> > I have a peculiar problem with my OGG/Speex implementation: I encode a
> short
> > PCM stream in OGG/Speex, but the result can not be read by VLC and
> MediaInfo
> > reports that the file is too short (240ms). In reality the file contains
> > about 2.7 sec worth of audio.
> >
> > Another interesting thing I noticed is that the file *can* be read
> > successfully in Audacity. Yes, that is right, Audacity reads the file
> > perfectly fine whereas all other tools only play a short swoosh.
> >
> > I am going to upload the files here: http://1drv.ms/1w7OPs6. The first
> one
> > (GoToServer-Igor.ogg) is the problematic one. The second one
> > (GoToServer_official.ogg) was generated using speexenc and plays just
> fine.
>
> You will want to step through your implementation and see how it
> behaves differently than speexenc, in this case.
>
> > The third one (GoToServer1.wav) is the original source.
> >
> > Questions:
> >
> > How do you guys typically go about debugging such issues?
>
> I usually do what you did, try different players until one works, and
> then look at what they're doing differently.
>
> > What OGG information is relevant to measuring the content length?
>
> You might want to check out https://github.com/moumar/ruby-ogginfo or
> other implementations that calculate the duration (I'm assuming that's
> what you mean by "length") of ogg files.
>
> > Any clues as to how come VLC can't read the file but Audacity can?
>
> VLC has a plugin that wraps libspeex (for decoding) and a plugin that
> wraps libogg (for demuxing). The issue might be in one or both of
> these plugins. You can also force VLC to demux with libavformat and
> decode with libavcodec (which I believe is what Audacity does in this
> case), by doing:
>
> vlc --demux avformat --codec avcodec GoToServer-Igor.ogg
>
> If this works (whereas the default didn't), consider filing a bug with VLC:
> https://wiki.videolan.org/Report_bugs
>
> Best,
> Tristan
>

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