theora - Oct 2005 - Snipping the beginning off Theora files

Hello all,

I'm sure that this must have been answered by someone in the past, but I
couldn't find it.

I have downloaded the Theora files of the 6uadec Gnome conference from:
http://stream.fluendo.com/archive/6uadec/

While it is great that they have them available, most of them seem to
have a lot of video of empty room before the speaker starts (sometimes
20 minutes or so). I am wanting to give these to a couple of people and
so would like to snip that 20 minutes off and end up with
smaller/shorter files which are minus the guff. Is there are simple tool
with which I can do this?

Secondly; if Vorbis is poor at low quality levels and Xiph develops
Speex specifically for speech, why aren't the audio tracks of conference
speeches done in speex instead of Vorbis?? Is this because people are
more likely to have Vorbis support than speex at this stage?

Thanks in advance,

Aaron

--
http://www.whitehouse.org.nz
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http://lists.xiph.org/pipermail/theora/2005-September/000983.html

On 10/30/05, Aaron Whitehouse <lists@whitehouse.org.nz>
wrote:
> Hello all,
>
> I'm sure that this must have been answered by someone in the past, but
I
> couldn't find it.
>
> I have downloaded the Theora files of the 6uadec Gnome conference from:
> http://stream.fluendo.com/archive/6uadec/
>
> While it is great that they have them available, most of them seem to
> have a lot of video of empty room before the speaker starts (sometimes
> 20 minutes or so). I am wanting to give these to a couple of people and
> so would like to snip that 20 minutes off and end up with
> smaller/shorter files which are minus the guff. Is there are simple tool
> with which I can do this?
>
> Secondly; if Vorbis is poor at low quality levels and Xiph develops
> Speex specifically for speech, why aren't the audio tracks of
conference
> speeches done in speex instead of Vorbis?? Is this because people are
> more likely to have Vorbis support than speex at this stage?
>
> Thanks in advance,
>
> Aaron
>
> --
> http://www.whitehouse.org.nz
>
>

pat cito wrote:
> http://lists.xiph.org/pipermail/theora/2005-September/000983.html
Thank you for this, Pat. The advice in that message is to use oggz-tools
which I have downloaded and read the manual of. I have come to the
conclusion that it was not designed to do what I am wanting to do with
it. It seems able to pull parts of a bitstream based on serial number or
the type of stream (Vorbis, Theora etc.) but it does not seem able to
output from a time to a time or anything. What I am hoping for is
something like:

cropogg --outputfile [path] --begintime 10:03 --endtime [end / 1:23:00]

But perhaps I am being overly optimistic. I suppose that I could try to
identify the serials of the first 20 minutes of pages and then use it,
but it seems a very difficult way to do something quite common and
simple. Theoretically all it needs to do is cut the first 20 mins of the
data stream while leaving the three(?) headers intact, or writing new
headers for the new stream (I believe that an ogg file missing the first
20 mins of the data stream would still be a valid file if the headers
were intact).

Thanks for your help and please let me know if I am just missing how to
use oggz-tools properly.

Aaron

--
http://www.whitehouse.org.nz
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I also know of 2 non-linear video editing tool:
 http://cinelerra.org/ that does import and export to theora
http://www.kinodv.org/ that does export only AFAIK

On 10/30/05, Aaron Whitehouse <lists@whitehouse.org.nz>
wrote:
> pat cito wrote:
> > http://lists.xiph.org/pipermail/theora/2005-September/000983.html
>
> Thank you for this, Pat. The advice in that message is to use oggz-tools
> which I have downloaded and read the manual of. I have come to the
> conclusion that it was not designed to do what I am wanting to do with
> it. It seems able to pull parts of a bitstream based on serial number or
> the type of stream (Vorbis, Theora etc.) but it does not seem able to
> output from a time to a time or anything. What I am hoping for is
> something like:
>
> cropogg --outputfile [path] --begintime 10:03 --endtime [end / 1:23:00]
>
> But perhaps I am being overly optimistic. I suppose that I could try to
> identify the serials of the first 20 minutes of pages and then use it,
> but it seems a very difficult way to do something quite common and
> simple. Theoretically all it needs to do is cut the first 20 mins of the
> data stream while leaving the three(?) headers intact, or writing new
> headers for the new stream (I believe that an ogg file missing the first
> 20 mins of the data stream would still be a valid file if the headers
> were intact).
>
> Thanks for your help and please let me know if I am just missing how to
> use oggz-tools properly.
>
> Aaron
>
> --
> http://www.whitehouse.org.nz
>
>