[FFmpeg-devel] [PATCH] Clearer wording of audio channel maping limitations

Clément Bœsch ubitux at gmail.com
Wed Dec 21 18:27:16 CET 2011

On Wed, Dec 21, 2011 at 05:18:32PM +0000, Tim Nicholson wrote:
> From 5b2af49325fc21163054acc4d3be1270a90ddc12 Mon Sep 17 00:00:00 2001
> From: Tim Nicholson <Tim.Nicholson at bbc.co.uk>
> Date: Wed, 21 Dec 2011 17:12:05 +0000
> Subject: [PATCH] Clearer explanation of audio channel mapping restrictions
> ---
>  doc/ffmpeg.texi |   10 +++++++---
>  1 files changed, 7 insertions(+), 3 deletions(-)
> diff --git a/doc/ffmpeg.texi b/doc/ffmpeg.texi
> index 553d759..83a45a8 100644
> --- a/doc/ffmpeg.texi
> +++ b/doc/ffmpeg.texi
> @@ -825,9 +825,13 @@ The following example split the channels of a stereo input into streams:
>  ffmpeg -i stereo.wav -map 0:0 -map 0:0 -map_channel 0.0.0:0.0 -map_channel 0.0.1:0.1 -y out.ogg
>  @end example
> -Note that "-map_channel" is currently limited to the scope of one input for
> -each output; you can't for example use it to pick multiple input audio files
> -and mix them into one single output.
> +Note that currently each output stream can only contain channels from a single
> +input stream; you can't for example use "-map_channel" to pick multiple input
> +audio channels contained in different streams (from the same or different files)
> +and merge them into a single output stream. It is therefore not currently
> +possible, for example, to turn two separate mono streams into a single stereo
> +stream. However spliting a stereo stream into two single channel mono streams
> +is possible.

LGTM, I'll push it soon if no one spot a typo or want to bikeshed about
it. Thank you :)

But even if it's much better than the current version, I hope we will be
able to drop that paragraph in a while ;)

Clément B.
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