[FFmpeg-user] Error after conversion back to WebM ( under IE 11 )

[RDP]

Greetngs!

Example of what I am experiencing is linked to here:

    http://musicbitz.org/WebMTest/

A sample .webm file is converted to .mp4, then back to .webm, using ffmpeg.
Basic syntax is used with no added flags or other options.

Viewing with Internet Explorer 11, under WInodws 8.1, the first two files play
back tickety-boo, but the conversion back to .webm fails to be
recognised successfully.

Converting most media files to WebM with ffmpeg, seems to produce the
same result.

All ideas and suggestion gratefully received!

Many thanks.

Regards,


Chris.
.