[FFmpeg-user] converting to AAC audio duration changes

[Francois Visagie]

> -----Original Message-----
> From: ffmpeg-user-bounces at ffmpeg.org [mailto:ffmpeg-user-
> bounces at ffmpeg.org] On Behalf Of Jeanne Rich
> Sent: 17 September 2013 18:48
> To: FFmpeg user questions
> Subject: Re: [FFmpeg-user] converting to AAC audio duration changes
> 
> As for the -map_metadata -1:s basically prevents any metadata that's in
the
> input from being copied over to the output.  I use this to remove the
> timecode track out of the quicktime movie.  It's kind of hidden in the
docs,
> took awhile to find, but here is the excerpt from the ffmpeg doc about
this.
> 
> "A negative file index can be used to create a dummy mapping that just
> disables automatic copying"
> 
> so the -1 is the negative file index.

Thanks.