theora - Jun 2009 - Further bug discovered with the Directshow decoder

Hi good people,
Just to inform:
I finally fed FFMpeg2Theora with a .VOB input, and the .OGV output produced
played back beautifully in VLC, both audio and video.  However, the same output
.OGV file gave clicks and pops in the audio when fed through Directshow
programs.  I played it through Windows Mediaplayer as well as through Winamp,
with the same crackles in the audio, and this leads me to assume the problem
might be directshow-dependent, especially since VLC plays the audio crisp and
clean.  Through Directshow both in Winamp and Windows MediaPlayer, , It sounds
like an old CD that has developed that "static" sound throughout the
audio.

Winamp still produces the upsidedown video as we've already identified.

Seems like Directshow has a bit of way to go before we can safely call for
public release, but I must say, it's marvelous thus far for a team of people
who do this as a charity project!

Also, I've figured that when using the --Optimize switch in FFMpeg2Theora,
it does correctly assume the correct output filename.ogv  from input
filename.vob.  It is probably only a problem using -Speedlevel 0.  Sorry for
miss-reporting earlier.  Also, my experience with that result was when feeding a
.avi file so not sure with other formats.

Also still not sure why videos from my digital camera whose audio is 11025
sampling speed,, outputs to a distorted scrambled sound result in the ogv
output.  Video is just fine.

On my server, you can find the Animals.vob file from which I replicate the
problem with the "static" sound in the audio, as well as the .ogv
output.
You can also find the "Lion.avi" file from my digital camera along
with the .ogv output whose audio is highly distorted and scrambled beyond
recognition.
ftp://temp:temp at gaurarecords.homeftp.org

Please forgive the fact that once I reach my bandwidth limit on the server, you
will get very very slow downloads.  Note that I will remove the server from 1
July as I will not want to lose all my limited bandwidth for another month. 
I'm doing just that this month for the sake of helping development. 
It's the least I can offer for the efforts of this great team.

And finally: Does anyone know where to find accessibility tips using VLC player
for visually impaired users?  I am one such user, really struggling to access
the interface with Jaws for Windows, especially the menu bar which only speaks
the first pull-down item once you pull down any menu item from the main
horizontal pull-down.  Also, Jaws cursor only sees the title bar and some
graphics.

If not done so already, I would like to get something going on accessibility
tips and tricks for VLC Player, as it is such a great program which can read so
many Video formats.

Kindest regards to all, from here in South Africa.

Yogan

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On 6/16/09, Yamuna Jivana dasa <ykhandoo at webmail.co.za>
wrote:
> Also still not sure why videos from my digital camera whose audio is 11025
> sampling speed,, outputs to a distorted scrambled sound result in the ogv
> output.  Video is just fine.
Hi,

If your disability does not impair you from using the mediafire.com
web site, could you upload there an original sample from your digital
camera.  I would like to check for the audio problem.  Hopefully
someone else will be able to find out what is wrong in the Directshow
filters.

-Ivo

Actually - if there are any issues with a11y for VLC, you might want
to talk to the VLC guys about it. They are in another open source
project and I am not sure anyone has reported about a11y to them yet.

Good luck!

Cheers,
Silvia.

On Wed, Jun 17, 2009 at 4:10 AM, Yamuna Jivana
dasa<ykhandoo at webmail.co.za> wrote:
> Hi good people,
> Just to inform:
> I finally fed FFMpeg2Theora with a .VOB input, and the .OGV output produced
> played back beautifully in VLC, both audio and video.? However, the same
> output .OGV file gave clicks and pops in the audio when fed through
> Directshow programs.? I played it through Windows Mediaplayer as well as
> through Winamp, with the same crackles in the audio, and this leads me to
> assume the problem might be directshow-dependent, especially since VLC
plays
> the audio crisp and clean.? Through Directshow both in Winamp and Windows
> MediaPlayer, , It sounds like an old CD that has developed that
"static"
> sound throughout the audio.
>
> Winamp still produces the upsidedown video as we've already identified.
>
> Seems?like Directshow has a bit of way to go before we can safely call for
> public release, but I must say, it's marvelous thus far for a team of
people
> who do this as a charity project!
>
> Also, I've figured that when using the --Optimize switch in
FFMpeg2Theora,
> it does correctly assume the correct output filename.ogv ?from input
> filename.vob.? It is probably only?a problem using -Speedlevel 0.? Sorry
for
> miss-reporting earlier.? Also, my experience with that result was when
> feeding a .avi file so not sure with other formats.
>
> Also still not sure why videos from my digital camera whose audio is 11025
> sampling speed,, outputs to a distorted scrambled sound result in the ogv
> output.? Video is just fine.
>
> On my server, you can find the Animals.vob file from which I replicate the
> problem with the "static" sound in the audio, as well as the .ogv
output.
> You can also find the "Lion.avi" file from my digital camera
along with the
> .ogv output whose audio is highly distorted and scrambled beyond
> recognition.
> ftp://temp:temp at gaurarecords.homeftp.org
>
> Please forgive the fact that once I reach my bandwidth limit on the server,
> you will get very very slow downloads.? Note that I will remove the server
> from 1 July as I will not want to lose all my limited bandwidth for another
> month.? I'm doing just that this month for the sake of helping
development.
> It's the least I can offer for the efforts of this great team.
>
> And finally: Does anyone know where to find accessibility tips using VLC
> player for visually impaired users?? I am one such user, really struggling
> to access the interface with Jaws for Windows, especially the menu bar
which
> only speaks the first pull-down item once you pull down any menu item from
> the main horizontal pull-down.? Also, Jaws cursor only sees the title bar
> and some graphics.
>
> If not done so already, I would like to get something going on
accessibility
> tips and tricks for VLC Player, as it is such a great program which can
read
> so many Video formats.
>
> Kindest regards to all, from here in South Africa.
>
> Yogan
>
>
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> theora at xiph.org
> http://lists.xiph.org/mailman/listinfo/theora
>
>