[Bug 748259] [PATCH] New audio/video level element

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=748259

Heinrich Fink <hfink at toolsonair.com> changed:

           What    |Removed                     |Added
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                 CC|                            |hfink at toolsonair.com

--- Comment #4 from Heinrich Fink <hfink at toolsonair.com> ---
We use it for displaying audio levels in our broadcast video application for
incoming streams / observing mixer outputs. Our customers would expect that
audio level is displayed on a per-video-frame basis. Imagine a test signal that
has a single white frame, and exactly in the duration of the frame a test sine
(silence otherwise). The user would expect to see an up-rise of the audio
levels exactly for the white frame.

This couldn't be done with the normal level element, so Vivia wrote the alevel
element.

Also: While you can set a fixed window with "level", hoping to be close to the
frame boundaries, you would have problems with NTSC-like frame rates (e.g.
30000/1001): Here, audio samples per video frame are a repeated pattern of
1602/1601/1602/1601/1602. That's properly handled by alevel.

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