theora - Mar 2010 - ffmpeg2theora bug: generation of a video from a series of images

Hi J.,

We are using ffmpeg2theora to produce an introduction video from a
series of images:

ffmpeg2theora-0.26.linux32.bin images/img-%03d.png -o intro.ogv

The video that we get is huge and horrible, with lots of blinking colors:
http://free-electrons.com/issues/ffmpeg2theora-mar5-2010/intro.ogv

Here's what we had in the past:
http://free-electrons.com/issues/ffmpeg2theora-mar5-2010/intro-correct.ogv

This issue was introduced in ffmpeg2theora-0.25, and a work-around is to
revert to ffmpeg2theora-0.24
(http://v2v.cc/~j/ffmpeg2theora/ffmpeg2theora-0.24.linux32.bin.bz2). I
also checked that this problem still happens with the latest snapshot
release.

All you need to reproduce this bug is in
http://free-electrons.com/issues/ffmpeg2theora-mar5-2010/

Even though the bug may not be in ffmpeg2theora, it would be great if
you could fix it. Don't hesitate to ask me to make further tests if this
can help.

Thanks for this very useful utility,

Cheers,

Michael.

-- 
Michael Opdenacker, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
+ 33 621 604 642

On 5 March 2010 15:26, Michael Opdenacker <michael at free-electrons.com>
wrote:
> Hi J.,
>
> We are using ffmpeg2theora to produce an introduction video from a
> series of images:
>
> ffmpeg2theora-0.26.linux32.bin images/img-%03d.png -o intro.ogv
>
> The video that we get is huge and horrible, with lots of blinking colors:
> http://free-electrons.com/issues/ffmpeg2theora-mar5-2010/intro.ogv
>
> Here's what we had in the past:
> http://free-electrons.com/issues/ffmpeg2theora-mar5-2010/intro-correct.ogv
>
> This issue was introduced in ffmpeg2theora-0.25, and a work-around is to
> revert to ffmpeg2theora-0.24
> (http://v2v.cc/~j/ffmpeg2theora/ffmpeg2theora-0.24.linux32.bin.bz2). I
> also checked that this problem still happens with the latest snapshot
> release.
>
> All you need to reproduce this bug is in
> http://free-electrons.com/issues/ffmpeg2theora-mar5-2010/
>
> Even though the bug may not be in ffmpeg2theora, it would be great if
> you could fix it. Don't hesitate to ask me to make further tests if
this
> can help.
perhaps you can track down the commit that introduced the different
behavior (eg. with git-svn and git bisect :)

Conrad.
(@CELF Jamboree atm :)

On 03/05/2010 01:26 AM, Michael Opdenacker wrote:
> Hi J.,
>
> We are using ffmpeg2theora to produce an introduction video from a
> series of images:
>
> ffmpeg2theora-0.26.linux32.bin images/img-%03d.png -o intro.ogv
>
> The video that we get is huge and horrible, with lots of blinking colors:
> http://free-electrons.com/issues/ffmpeg2theora-mar5-2010/intro.ogv
>
> Here's what we had in the past:
> http://free-electrons.com/issues/ffmpeg2theora-mar5-2010/intro-correct.ogv
>
> This issue was introduced in ffmpeg2theora-0.25, and a work-around is to
> revert to ffmpeg2theora-0.24
> (http://v2v.cc/~j/ffmpeg2theora/ffmpeg2theora-0.24.linux32.bin.bz2). I
> also checked that this problem still happens with the latest snapshot
> release.
>
> All you need to reproduce this bug is in
> http://free-electrons.com/issues/ffmpeg2theora-mar5-2010/
>
> Even though the bug may not be in ffmpeg2theora, it would be great if
> you could fix it. Don't hesitate to ask me to make further tests if
this
> can help.
>
> Thanks for this very useful utility,
>
> Cheers,
>
> Michael.
>
>   
I just tested this image sequence using png2theora from ptalarabvorm,
and I also got some weird outlining of the text as well as some
flashing.  This image sequence looks like a great test for Theora!

It is a high-contrast text + graphics image that is not overly complex. 
It fades-in from black and then fades-out to black again.

I'm sorry this doesn't actually address your concern, though.  But
I'm
sure we'll find a solution.