Encoding with ffmpeg2theora results in invalid frame duration with mplayer

[Fabio Varesano]

I'm trying to encode to Ogg/Theora this screencast:
http://www.sensible.com/rocketsurgery/Steve%20Krug%20Demo%20Usability%20Test.mov

Result of ffmpeg -i:
Duration: 00:24:26.40, start: 0.000000, bitrate: 358 kb/s
     Stream #0.0(eng): Audio: aac, 44100 Hz, mono, s16, 63 kb/s
     Stream #0.1(eng): Video: h264, yuv420p, 1024x768, 290 kb/s, 600 fps, 15 tbr, 600 tbn, 1200 tbc

My command line is (I'm using ffmpeg2theora 0.25):
ffmpeg2theora -A 64 -c 1 --inputfps 15 -x 1024 -y 768 -F 15 --optimize -v 8 Steve\ Krug\ Demo\ Usability\ Test.mov -o prova1.ogv

Unfortunately, once I play the resulting file with mplayer
(MPlayer SVN-r30325-4.4.2) I get various errors:

Invalid frame duration value (0.067/0.000 => -0.067). Defaulting to 0.067 sec.
A: 6.2 V: 6.2 A-V: 0.001 ct: 0.089 93/ 93 0% 0% 0.2% 0 0
Invalid frame duration value (6.267/0.000 => -6.267). Defaulting to 0.067 sec.
A: 14.8 V: 8.6 A-V: 6.218 ct: 0.202 129/129 0% 0% 0.3% 1 0
Invalid frame duration value (8.667/0.000 => -8.667). Defaulting to 0.067 sec.
A: 29.8 V: 15.3 A-V: 14.488 ct: 0.676 230/230 0% 0% 0.3% 7 0
Invalid frame duration value (15.400/0.000 => -15.400). Defaulting to 0.067 sec.

Additionally vlc isn't able to play the resulting video file. It gives back:
[fabio@gamma SteveKrug-RocketSurgeryMadeEasy]$ vlc prova1.ogv
VLC media player 1.0.4 Goldeneye
[0x7f09b8000f58] main input error: ES_OUT_RESET_PCR called

I also tested the same encoding with ffmpeg2theora from svn as of today (1 Feb 2010).. but the results are just the same.

Any suggestions? Ideas?

Thanks,

Fabio Varesano

[j^ (j)]

the file should play back fine in firefox 3.5 and later or totem(gstreamer). most likely your content is rather static for some frames so a feature of theora to indicate duplicate frames, is used.
mplayer had an issue with this due to a bug in ffmpeg, this should have been fixed in svn.