[theora] Further bug discovered with the Directshow decoder

Silvia Pfeiffer silviapfeiffer1 at gmail.com
Wed Jun 17 03:14:32 PDT 2009

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!


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@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
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