[theora] Bad results, encoding keynote presentation videos

[Gabriel TEIXEIRA]

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.
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>
>
>    
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