[FFmpeg-user] FFmpeg, webm and Firefox

[Hartmut]

I have an unusual and new problem with webm-files made by ffmpeg and 
Firefox as player. I have made several webm's from DV-material for my 
website and they were all played ad hoc and fine. 4 weeks ago I 
converted another video in the same way to webm. But this one is not 
played by FF except I forward the video by 3 seconds and click play 
then. Confusion!

So I tried some of my old videos and all was fine. I tried the new video 
with Chrome and Opera and they played this video. But Firefox not. Why? 
The only things that are changed in the time between the last - playing 
- video and this new ist the version of Firefox and the version of 
ffmpeg. So I tried an older version of FF to no avail. So it must be a 
problem caused by ffmpeg ...

This is the command-line for converting (DV is 720x576, 16:9):
ffmpeg -i Rohfilme/infile.dv -c:v libvpx -b:v 1000k -c:a libvorbis -b:a 
128k -ar 44100 -ac 2 Rohfilme/outfile.webm
or
ffmpeg -i Rohfilme/infile.dv -c:v libvpx -s 1024x576 -b:v 1000k -c:a 
libvorbis -b:a 128k -ar 44100 -ac 2 Rohfilme/outfile.webm

You can try an old video at: 
http://hartmut.homelinux.org/Oldtimer/Bella/Videos/Bellatreffen-2009.html
and the new one at: http://hartmut.homelinux.org/Downloads/Hochzeit.webm

Regards,

Spielmops

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