Re: [Audacity-devel] FFmpeg export GSM, AMR and MP4 on Windows

[LRN <lr...@gm...>]

Gale Andrews wrote:
> OK, but I think this raises the question of whether we even include AMR
> as an option. As far as the general user goes, they won't be able to
> build FFmpeg, and even to the more savvy it presents big problems
> building it on Windows as there is no MSVC support.
>
>    
On Linux building FFmpeg with AMR support is trivial, so the option stays.
> If we do offer it as an option, the current error provided isn't really
> helpful. So I guess it would make more sense to point them to the
> FFmpeg FAQ I suggested (which will also have links to FFmpeg hosted
> outside Europe/USA). Whether on the FAQ we tell the general
> Windows user to go and make the AMR using SuperPlayer:	
> http://www.erightsoft.com/SUPER.html#Dnload
>
> would be a moot point?
>    
OK, i can add custom error message for AMR - that's no problem.
> I did some testing of all FFmpeg formats that native Audacity does not
> support:
>
> * MP4 (8 bit or 16 bit) gives this Quick Time for Windows error:
>    "Error -2041: an invalid sample description was found in the movie (ffmpeg.mp4)"
>
>     So of course iTunes for Windows does not play it either (no error,
>     nothing happens). MP4 will have to work in iTunes for it to be
>     useful, needless to say. Does iTunes for Windows use DirectShow?
>     The MP4s play fine in VLC.
>    
About DirectShow and iTunes - no idea. Since i don't have iTunes, i'll 
stick with DirectShow and foobar2000 - i'll stop digging this issue once 
they are playing mp4s produced by Audacity.
> * Real Audio: MPC can't play .ra v3 ("unspecified error"); it opens and
>     plays .ra v9 but there is no sound. I have Real Alternative installed.
>    
RA3 = AC3
RA9 = AAC
Or, at least, Wikipedia says so.