[theora] Bad results, encoding keynote presentation videos

Michael racingralph2009+theora at gmail.com
Wed Aug 11 07:54:17 PDT 2010


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:

my result:

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':
    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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