This is a video result of `soundvolume-1secplayed.swf` under Flash Player:
http://www.mediafire.com/?qck5cxf9h9npncm

You'd see that volume level was reduced around 2 sec after starting.

This is a video result of `soundvolume-1secplayed.swf` under Gnash:
http://www.mediafire.com/?lrqv575jotfv6c3

You'd see that the sound was played entirely in full volume.


Screecasts from both players and log files from Gnash (verbosity 2 with
action error log) are attached as `soundvolume-roundup.4c03566-fp9.0.45.0.zip`.

Gnash: 0.8.11dev (git 4c03566 19-Dec-2015)
System: Debian GNU/Linux 7.0 Wheezy i386

Flash Player: 9.0r45 (9.0.45.0) Standalone
System: Microsoft Windows XP Professional SP3

(file #35884)

This is still reproducible under current git version of Gnash, and is not
really specific to adjusting volume while the sound was playing.

I have created simple SWF files (Flash 7, using MTASC and SWFmill) that tries
to play embedded sound with adjusted volume from ActionScript in five style:

# No volume adjustment, as a reference: `soundvolume-ref.swf`
# Reduce volume right before running `Sound.attachSound()`: `soundvolume-preattach.swf`.
# Reduce volume right before playing sound: `soundvolume-preplay.swf`.
# Reduce volume right after started playing sound: `soundvolume-playing.swf`.
# Reduce volume 1 second after started playing sound: `soundvolume-1secplayed.swf`.

It turned out that changing embedded sound volume using all of the way
mentioned here have no effect under Gnash; they all played in full volume.
(All of them works in expected fashion when running under Adobe Flash Player)

Test SWF files, source code, and sound (PCM 44100 Hz 16-bit Mono, 5.0 sec)
are attached as `soundvolume.zip`. Comparison screencast and logs will follow.

Gnash: 0.8.11dev (git 4c03566 19-Dec-2015)
System: Debian GNU/Linux 7.0 Wheezy i386

Flash Player: 9.0r45 (9.0.45.0) Standalone
System: Microsoft Windows XP Professional SP3


(file #35849)

Here's the code:

var globalSound = new Sound(this);
var muted = false;

sign.popUpMenu.muteButton.onRelease = function () {
  muted = !muted;
  if( muted ) {
    globalSound.setVolume(0);
  } else {
    globalSound.setVolume(100);
  }
};