theora - Aug 2010 - Bad results, encoding keynote presentation videos

Hello,

hope you can help me. I want to encode a video, which I have exported
from Keynote (a program for presentation like MS Power Point) using
ffmpeg2theora for html5 web delivery.

The result only plays very buggy - frames are dropped, the video hangs
and vlc can not output the correct length of the ogv video.

Here is the source and the result for download, if you want to reproduce it:

the source, which plays smooth:
http://dl.dropbox.com/u/1477005/test_vid01.mp4

my result:
http://dl.dropbox.com/u/1477005/test_vid01.ogv

I am using:
ffmpeg2theora 0.27 - Xiph.Org libtheora 1.1 20090822 (Thusnelda)

Here is the output of ffmpeg2theora:

$ ffmpeg2theora /Users/michi/Desktop/test_vid01.mp4
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
'/Users/michael/Desktop/test_vid01.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf52.78.1
  Duration: 00:00:23.96, start: 0.000000, bitrate: 245 kb/s
    Stream #0.0(eng): Video: h264, yuv420p, 640x360, 241 kb/s, 25.04
fps, 25 tbr, 600 tbn, 1200 tbc

  0:00:24.00 audio: 0kbps video: 151kbps, time elapsed: 00:00:19
  0:00:23.96 audio: 0kbps video: 151kbps, time elapsed: 00:00:19


Perhaps you have an ideam what's going on here..

Thanks in advance, Michael.

On 11/08/2010 16:54, Michael wrote:
> Hello,
>
> hope you can help me. I want to encode a video, which I have exported
> from Keynote (a program for presentation like MS Power Point) using
> ffmpeg2theora for html5 web delivery.
>
> The result only plays very buggy - frames are dropped, the video hangs
> and vlc can not output the correct length of the ogv video.
>
> Here is the source and the result for download, if you want to reproduce
it:
>
> the source, which plays smooth:
> http://dl.dropbox.com/u/1477005/test_vid01.mp4
>
> my result:
> http://dl.dropbox.com/u/1477005/test_vid01.ogv
>
> I am using:
> ffmpeg2theora 0.27 - Xiph.Org libtheora 1.1 20090822 (Thusnelda)
>
> Here is the output of ffmpeg2theora:
>
> $ ffmpeg2theora /Users/michi/Desktop/test_vid01.mp4
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
'/Users/michael/Desktop/test_vid01.mp4':
>    Metadata:
>      major_brand     : isom
>      minor_version   : 512
>      compatible_brands: isomiso2avc1mp41
>      encoder         : Lavf52.78.1
>    Duration: 00:00:23.96, start: 0.000000, bitrate: 245 kb/s
>      Stream #0.0(eng): Video: h264, yuv420p, 640x360, 241 kb/s, 25.04
> fps, 25 tbr, 600 tbn, 1200 tbc
>
>    0:00:24.00 audio: 0kbps video: 151kbps, time elapsed: 00:00:19
>    0:00:23.96 audio: 0kbps video: 151kbps, time elapsed: 00:00:19
>
>
> Perhaps you have an ideam what's going on here..
>
> Thanks in advance, Michael.
> _______________________________________________
> theora mailing list
> theora at xiph.org
> http://lists.xiph.org/mailman/listinfo/theora
>
>
>    
This video plays nice for me on Mozilla Firefox 3.6.8 and on Totem 
2.30.2 on Ubuntu Linux 10.04 x64 although VLC 1.0.6 has difficulties to 
control the time of play. I think the problem is in the VLC which 
sometimes doesn't play my ogg videos correctly. Try other player and 
tell the results.

Best Regards
Gabriel Teixeira

On 11 August 2010 07:54, Michael <racingralph2009+theora at gmail.com>
wrote:
> The result only plays very buggy - frames are dropped, the video hangs
> and vlc can not output the correct length of the ogv video.
I'm not sure what the source of your problem is, but if it helps, you
video plays fine for me in firefox and totem (gstreamer player on
linux). oggz-validate doesn't see anything wrong with it.

 -r

i had the same issue for my theora videos encoded with ffmpeg2theora using 
libtheora 1.1 20090822 with still frames when playing with vlc... still frames 
play only for one frame, no matter how long they are... but i do not think that 
this is the problem with ffmpeg2theora or libtheora it uses... even though i 
didn't check it with latest builds of libtheora, i think  this is the
problem
with vlc, not with thora. my videos do play well with firefox... however, when 
people download the video and try to play it with vlc, the problem occurs... 



i tested your videos and they play fine with both firefox and vlc when 
downloaded...


by the way, you can always get ffmpeg2theora builds using latest libtheora from 
the link below... 

http://www.firefogg.org/nightly/

firefogg always uses the latest builds... 

current one uses libtheora 1.1+ 20100314





 .-_-.


http://httpdot.net/.-_-./

-----------------------------------


From: Michael <racingralph2009+theora at gmail.com>
Subject: [theora] Bad results, encoding keynote presentation videos


The result only plays very buggy - frames are dropped, the video hangs
and vlc can not output the correct length of the ogv video.


      
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
http://lists.xiph.org/pipermail/theora/attachments/20100812/cd6bfe3c/attachment.htm