[FFmpeg-user] FFmpeg, webm and Firefox

[Christian Ebert]

* Hartmut on Thursday, April 25, 2013 at 13:39:57 +0200
> 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

I can confirm the problem in FF.

The sample aspect ratio is still PAL: 64:45. Try:
-filters:v scale=1024:576,setsar=1/1

In combination with filters I prefer to use the scale filter
instead of the -s option.

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