[FFmpeg-user] Offlist, Is mixing of audio channels happening by defaultin ffmpeg?

Bouke (VideoToolShed) bouke at videotoolshed.com
Fri Jul 19 02:27:26 CEST 2013

Since i'm working on audio mapping anyways, i can help testing if you like.
Since you're not a native english speaker (I'm neither), where are you from 
/ what's your native language?
(Concidering your name i would think Spanish, but one never knows...)


van Oldenbarneveltstraat 33
6512 AS  NIJMEGEN, the Netherlands
+31 24 3553311
----- Original Message ----- 
From: "Carl Eugen Hoyos" <cehoyos at ag.or.at>
To: <ffmpeg-user at ffmpeg.org>
Sent: Thursday, July 18, 2013 3:47 PM
Subject: Re: [FFmpeg-user] Is mixing of audio channels happening by 
defaultin ffmpeg?

> Sam Marrocco <smarrocco <at> ringsidecreative.com> writes:
>> On 7/18/2013 9:30 AM, Carl Eugen Hoyos wrote:
>> Sam Marrocco <smarrocco <at> ringsidecreative.com> writes:
>> > Is it possible to manually (through commandline args)
>> > tell it to copy all streams across without the
>> > (apparently bugged) -map 0 option?
>> How is this option bugged?
>> Perhaps I am reading what you wrote incorrectly:
>> "Note that if you specify -map 0 (to copy all streams), all
>> output audio tracks except the first one will be silent....
>> This is probably trivial to fix "
>> If when asked to copy all the streams with -map 0
>> (implying they will be copied as is) they are copied
>> silent (without sound?) doesn't that imply that it does
>> not work correctly?
> Sorry I am not a native speaker and probably did not
> explain well.
> In the past, when a mov file was written with more than
> one audio stream, all audio streams were marked as
> "default" streams, meaning if you prepared a mov file
> for an iDevice containing a movie with several language
> tracks, all tracks were played simultaneously on playback.
> (Making the feature of muxing several audio tracks into
> mov useless to some degree.)
> A change was committed that marked the first of several
> audio tracks as "default" and all other tracks as "non-
> default" (or as I badly named it: "silent").
> This allows to select the language you like at playback
> and at the same time default playing (without selecting
> a language) works fine.
> There is apparently a usecase (that I still don't
> understand completely) where you want all audio tracks to
> be marked as "default" (or non-silent).
> I am searching for a volunteer to help me testing this
> use-case.
> Note that even for the mentioned use-case that currently
> does not work out-of-the-box, it is still possible to
> activate the silent tracks in your application (iiuc).
> Carl Eugen
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