[FFmpeg-user] Offlist, Is mixing of audio channels happening by defaultin ffmpeg?
bouke at videotoolshed.com
Fri Jul 19 02:30:51 CEST 2013
hmm, all offlist messages are equal, but some...
(And for Carl, you'll pick it up anyways...)
van Oldenbarneveltstraat 33
6512 AS NIJMEGEN, the Netherlands
+31 24 3553311
----- Original Message -----
From: "Bouke (VideoToolShed)" <bouke at videotoolshed.com>
To: "FFmpeg user questions" <ffmpeg-user at ffmpeg.org>
Sent: Friday, July 19, 2013 2:27 AM
Subject: [FFmpeg-user] Offlist,Is mixing of audio channels happening by
> Since i'm working on audio mapping anyways, i can help testing if you
> 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
>> 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
>> ffmpeg-user mailing list
>> ffmpeg-user at ffmpeg.org
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