atrocity wrote: 
> It seems likely that all I need to do is find the right set of options
> on the ffmpeg command line, but looking at the extensive documentation
> last night made my tiny little brain hurt. I'm pretty sure that a big
> part of the problem is that what ffmpeg calls "metadata" and you refer
> to more correctly as the file structure is being carried over from the
> video file. I theoretically know how to override that, I just don't know
> what values I need to use, if that makes any sense.

Got the file.  The mdat audio is at the end which make it playable and
as you say there is metadata present.  I need to look some more but
there are some video specific data  - I wonder whether the metadata is
tied to the video channel and not the audio channel.

The command line you used is simple  but good enough for most
applications.  It did not remove the video channel completely and if
original metadata is on the video channel, then it will not have been
mapped into the audio channel.

Regarding ffmpeg - it is a swiss army knife and very useful but can
often injure the user.  A lot of options are very poorly documented for
example look at "ffmpeg -help muxer=f4v" which relate to MPEG4 but could
be used to override "brand" if that is the issue.


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