touch-packages team mailing list archive

[Andrew Hayzen <1531650@xxxxxxxxxxxxxxxxxx>]

Yup, while mediascanner2 is scanning the app is unusable :-/

This bug is probably a duplicate of bug 1529991 (qmlscene crashes if
music app is started while mediascanner is extracting) and linked to
others about high CPU (bug 1442035, bug 1237065).

It took 1 hour and 40 minutes for mediascanner2 to complete its scan on
my laptop [0], rendering the laptop useless due to the disk activity.
Upon analysis I could see the sqlite lock file appearing as it adds
every individual file to the store, which suggests it might be doing a
commit as each track/video/picture is added, if this is the case could
it not batch these into groups?

However, while scanning it would be better not to crash/be in a bad
state. So could the mediascanner always give a valid model to the music-
app, and if it doesn't exist already, is there a property to tell us
when mediascanner is scanning? As we could show up a notification while
this is occurring, to at least alert the user of what is happening?

This tends not to happen too often on the device, as by the time you
have transferred files to it via MTP mediascanner has scanned. But in
the case of the desktop where you can already have the media there or
when a SD card is plugged into the device, this appears to occur quite
often.


For reference Rhythmbox took around 2-3 minutes to scan the same data and didn't cause high disk usage, still allowing me to use the laptop.

0 - I have ~3600 audio files (~60GB), 10,600 photos (~7GB),  ~180 videos
(~30GB).

** Changed in: music-app
       Status: New => Confirmed

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to mediascanner2 in Ubuntu.
https://bugs.launchpad.net/bugs/1531650

Title:
  Crashes and other bad behavior while mediascanner is indexing

Status in Ubuntu Music App:
  Confirmed
Status in mediascanner2 package in Ubuntu:
  New

Bug description:
  The attached archive contains 7000 "songs: of 1-second silence. Untar
  the archive into the music folder. The mediscanner will take several
  minutes to index the collection.

  Start the music app while the mediascanner is running. I'm seeing
  different kinds of errors every time I kill the music app and start it
  again while the mediscanner is indexing.

  Sometimes, it's an instant crash.

  Sometimes, I get the "No music found" page.

  Sometimes, I get the song list, but the song list is empty and will
  not fill.

  Sometimes, I get this in the application log:

  Error finalising statement: Could not finalize statement: database is locked
  Failed to retrieve rows: database is locked

  And this:

  Failed to start a new media-hub player session:  org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
  Failed to create a new media player backend. Video playback will not function. 

  Could not finish contructing new AalMediaPlayerService instance since
  m_hubPlayerSession is NULL.

  Basically, the application is completely unusable and broken while
  indexing is in progress. Once mediascanner finishes indexing, things
  behave normally again.

  This makes for a seriously bad user experience when someone inserts a
  flash card with their music collection and, almost certainly, will
  immediately go to the music app to start playing things.

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