[FFmpeg-devel] [PATCH 1/2] lavfi/ebur128: add support for smaller video sizes

[Clément Bœsch]

(sorry for the delay)

On Sun, Nov 16, 2014 at 10:53:15PM +0100, Marton Balint wrote:
> Signed-off-by: Marton Balint <cus at passwd.hu>
> ---
>  doc/filters.texi        |  4 ++--
>  libavfilter/f_ebur128.c | 11 ++++++++---
>  2 files changed, 10 insertions(+), 5 deletions(-)
> 
> diff --git a/doc/filters.texi b/doc/filters.texi
> index 53f4cb2..713989c 100644
> --- a/doc/filters.texi
> +++ b/doc/filters.texi
> @@ -10146,8 +10146,8 @@ activated. Default is @code{0}.
>  
>  @item size
>  Set the video size. This option is for video only. For the syntax of this
> -option, check the "Video size" section in the ffmpeg-utils manual. Default
> -and minimum resolution is @code{640x480}.
> +option, check the "Video size" section in the ffmpeg-utils manual. The default
> +resolution is @code{640x480}, the minimum is @code{480x102}.
>  

Quoting the EBU 3341:
  An ‘EBU Mode’ meter shall offer two scales, for when a scale is shown,
  selectable by the user:
  1. range -18.0 LU to +9.0 LU (-41.0 LUFS to -14.0 LUFS), named ‘EBU +9
  scale’
  2. range -36.0 LU to +18.0 LU (-59.0 LUFS to -5.0 LUFS), named ‘EBU +18
  scale’

When you go down to 480x102, the printed range becomes [-16;+8] LU for +9
scale and [-32;+16] LU for +18 scale (see meter option). I think these
range boundaries should be preserved in the output.

[...]

-- 
Clément B.
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