8tracks website pop-ups an annoying dialog "Required plugin not found - Nuvola Player requires to install plugins to support the following multimedia feature: ABOUT protocol source"

Thanks for taking time to report this issue. Unfortunately, I'm not able to reproduce it on my development machines. However, I'll try to find a workaround for the issue anyway. Could you attach a screenshot of the Nuvola Player window with the annoying message?

Hi Jiri, many thanks for the response.

Attached is a screenshot of the popup message. It seems a plugin is briefly searched for every time a track plays / a new playlist is selected - then this message is displayed.

Could you perform the WebKit compatibility test? See http://nuvolaplayer.fenryxo.cz/help/troubleshooting/8tracks.html

Hi Jiri,

I have followed the steps for the Webkit compatibility test.

I was unable to complete step 3 as it could not find the webkitgtkframe directory within /usr/libexec/nuvolaplayer

(bash: /usr/libexec/nuvolaplayer/webkitgtkframe: No such file or directory)

Running Nuvola in debug mode (step 4), I attempted to successfully replicated the issue and received the following terminal output:

CRITICAL:Could not find any packages to operate on
    Nuvola Debug notifications.vala:216: Show notification
    Nuvola Debug mpris.vala:315: MPRIS: song changed
    Nuvola Debug mpris.vala:296: MPRIS Player: Metadata changed
    Nuvola Debug player.vala:375: Playback state changed: paused → playing
    Nuvola Debug mpris.vala:296: MPRIS Player: can-play changed
    Nuvola Debug mpris.vala:296: MPRIS Player: can-pause changed
    Nuvola Debug notifications.vala:216: Show notification
    Nuvola Debug mpris.vala:296: MPRIS Player: playback-status changed
    Nuvola Debug player.vala:411: Artist changed: Katrina and the Waves → MOTIVATION
    Nuvola Debug player.vala:418: Song changed: Walking On Sunshine → PAIN IS TEMPORARY
    Nuvola Debug player.vala:425: Album changed: Uploaded by musicfromthebook → Uploaded by valderino
    Nuvola Debug notifications.vala:216: Show notification
    Nuvola Debug mpris.vala:315: MPRIS: song changed
    Nuvola Debug mpris.vala:296: MPRIS Player: Metadata changed
    Nuvola Debug lyrics.vala:255: Fetch error: Song PAIN IS TEMPORARY was not found in cache
    Nuvola Debug lyrics.vala:396: AZLyrics: http://www.azlyrics.com/lyrics/motivation/painistemporary.html
    Nuvola Debug notifications.vala:228: Show notification callback
    Nuvola Debug lyrics.vala:255: Fetch error: Song PAIN IS TEMPORARY was not found on AZ Lyrics

The issue does not occur within the WebKit2GTK mini browser.

It appears to be an issue with the Unity integration for displaying song information for the current playing track, but I'm not sure.

> I was unable to complete step 3 as it could not find the webkitgtkframe
> directory within /usr/libexec/nuvolaplayer
>
> (bash: /usr/libexec/nuvolaplayer/webkitgtkframe: No such file or
> directory)

Are you sure you have installled Nuvola Player 2.4 from Unstable
builds PPA as requested in step 1? What does `nuvolaplayer --version`
show?

> Running Nuvola in debug mode (step 4), I attempted to successfully replicated the issue and received the following terminal output:

The debug output is incomplete. Please post full debug output from
line with "$ nuvolaplayer --debug" to the end.

> It appears to be an issue with the Unity integration for displaying song
> information for the current playing track, but I'm not sure.

Why do you think so?

Although I didn't complete the webkit thing, I will say I have 2.4~r817.unstable and this issue. I have the flash plugin disabled and the following extensions:
Dock manager
Last.fm and libre.fm
lyrics fetching
media keys
remote player interface
notifications
tray icon
unity quicklist (I'm running gnome)

Things that can make it go away:
Enable the flash plugin

Things that did not work:
Disabling the notification extension

I'll try other extensions later

I also found this problem: when a song ends playing and the next one starts, a system dialog pops up with the metioned message. It doesn't happen the first time the 8tracks Play is clicked on the website, though.

Console output for each requested command can be found in the attached file.

System info:
* Linux Mint 17 Cinnamon (clean install, all upgraded) 64 bit
* Nuvola Player package: nuvolaplayer; version: 2.4~r817.unstable-0.1~trusty
* NOT installed package: nuvolaplayer-flashplugin (reason: it's totally insane, it requests installing 123 new packages in their 32 bit versions, ranging from gcc to x11 andcryptography stuff; no way I'm installing this)

3. WebKitGtk test
The issue is reproducible:
"webkitgtkframe requires to install plugins to support the following multimedia feature: ABOUT protocol source"

4. Nuvola Player test
The issue is reproducible:
"Nuvola Player requires to install plugins to support the following multimedia feature: ABOUT protocol source"

6. Ubuntu 14.04: WebKit2Gtk test
Run WebKit2Gtk MiniBrowser in terminal:

First command:
$ /usr/lib/x86_64-linux-gnu/webkit2gtk-3.0/libexec/MiniBrowser \
http://8tracks.com
The issue is NOT reproducible

Second command:
$ MOZ_PLUGIN_PATH=/opt/nuvolaplayer/flash/wrapped \
/usr/lib/i386-linux-gnu/webkit2gtk-3.0/libexec/MiniBrowser \
http://8tracks.com
No such file or directory

Second command (fixed for 64 bit):
$ MOZ_PLUGIN_PATH=/opt/nuvolaplayer/flash/wrapped \
/usr/lib/x86_64-linux-gnu/webkit2gtk-3.0/libexec/MiniBrowser \
http://8tracks.com
The issue is NOT reproducible

Attached you can find the screenshot corresponding to the popup dialog which appeared during the debug run of the application

Thanks for your responses. I've updated description of this bug, see it for details.

May you please indicate which is the third-party library causing the issue, and a link to the upstream issue report? That way we can follow up on their decisions.
Thank you for your efforts,
Juan

Reported upstream: https://bugs.webkit.org/show_bug.cgi?id=133605

Note to self: It might be possible to fool GStreamer by specifying custom GST_INSTALL_PLUGINS_HELPER that does nothing. Yet another ugly hack :-(

https://developer.gnome.org/gst-plugins-libs/1.0/gst-plugins-base-libs-gstpbutilsinstallplugins.html

Does the issue disappear if you launch Nuvola Player with the following command?

GST_INSTALL_PLUGINS_HELPER=/usr/bin/true nuvolaplayer -D

I have the same problem in my new Jango service integration:
https://bugs.launchpad.net/nuvola-player/+bug/1009931/comments/5

And after launching Nuvola Player with the proposed command:
GST_INSTALL_PLUGINS_HELPER=/usr/bin/true nuvolaplayer -D

The ABOUT message does not appears any more, the problem seems solved: it seems a good workaround.

#13 I can also confirm that the issue doesn't happen when launching with the specified command line; it's effective working around the issue.
Now I'd suggest updating nuvola with this, and also keep this issue open while the real problem gets fixed upstream and this workaround can get removed.