Gnash

Gnash is a GNU Flash movie player and as a plugin to Browse is the default Flash player on the XO. It is the free software counterpart to the Adobe Flash player.

About Flash

Wikipedia has a good overview of the various Flash technologies. Flash animations and games typically have the .swf extension, while Flash videos typically use the .flv extension. Flash technologies include the ActionScript virtual machine, as well as many proprietary codecs that are covered by patents.

intalation flash player

No sound in Gnash

Gnash requires additional software libraries for GStreamer to play sounds in .swf files (<trac>8504</trac>). The relevant software has patent encumbrances, see Restricted formats. The issue persists in release 10.1.2.

It is possible to install packages containing the needed software using yum or rpm; the Talk:Gnash page has steps that have worked for users. In release 8.2.0 the task is made more complicated because it uses an earlier version of GStreamer.

Gnash bugs

Gnash 0.8.3 (ships with release 8.2.0)

[[Click to play]] is invisible

Unlike the Adobe Flash Player, Gnash doesn't immediately play Flash content (this is a feature). You need to click its "[[Click to play]]" text. But this text is often invisible when the mouse cursor is inside the Flash movie.

Other issues

• If sound is enabled, there are some sound incompatibility bugs when playing Flash 7 or 8 content
• Looping background sound in Flash Lite 2.0 (which is based on Flash 7) content plays back incorrectly. It breaks up with a lot of noise & hissing, and the volume levels change throughout sound playback.
• The onSoundComplete event does not seem to fire properly - thus sound that is looped using onSoundComplete as a trigger to start looping again will only play once and will not loop.

Gnash 0.8.2 (ships with release 8.1.2 (build 711))

• _x, _y & _rotation problems when rendering fonts
• If sound is enabled, there are some sound incompatibility bugs when compared to Flash 7 & 8.

Shipping Adobe Flash controversy

Adobe provides Flash under a free, but somewhat restrictive license. Adobe's license clearly restricts any party besides Adobe from making Flash libraries available on the Internet, and may make it possible to distribute within an Intranet. Some, such as Bryan Berry, have speculated that providing Flash plug-ins as downloads in certain deployments would further the educational goals of the overall project.

Other voices suggest that providing more incentives, better tools, and more complete implementations for Flash developers may help them to embrace open formats. There is some undesirability of a long term dependence on a commercial entity for core functionality or core file formats.

Example videos

Playable in Gnash on the XO

• YouTube, part of the Not-Evil Empire

Playable on the XO using neither Gnash nor Flash

• Dailymotion demos of new site

Not playable in Gnash on the XO

• Sesame Street Workshop (including Elmo's World, etc)
• OLPC.TV
• Mary Lou Jepsen keynote at Greener Gadgets Conference
• Blip.TV
• Revver.com

Upgrading Gnash

Enabling and disabling Gnash

You can uninstall or reinstall Gnash as you would any package: from the Terminal Activity, sudo yum remove gnash -y or sudo yum install gnash -y After which you will want to reboot.

Development builds

There are rpms of later Gnash versions at http://www.getgnash.org. Version 8.5 adds XVideo support, just add et XVideo true to your $HOME/.gnashrc file. Some of these builds dynamically link ffmpeg to avoid problems with the non-standard GStreamer in 8.2.x releases. See mailing list message.

Links

• Gnash homepage
• Gnash mailing list : gnash-dev /at/ gnu.org