PlayAudioFile() throws exception

[bgowland]

One user of the DVB-T Radio plugin is having trouble getting it to work - the original problem (there have been others since ) is that PlayAudioFile() throws an exception when trying to play the buffer mp3 file. From the user's DvbtrServiceMessenger.log...

Code:

06/10/2008 23:32:09.050 Invoking PlayAudioFile() for I:\Videos\Recordings\gbnetradio-0.mp3
06/10/2008 23:32:09.191 Play2() threw exception: Object reference not set to an instance of an object.   at DirectShowPlayerBase.playMusicFile(DirectShowPlayerBase* , Char* filename, HWND__* ownerHwnd)
   at NativeUtilities.MediaHelper.playMusicFile(String filename, Form form)
   at GBPVRX2.Players.x6a72974b4271f25b.x40e14381fcc044ba(String x2083fea7eed1486c)
   at GBPVRX2.Players.xa5ae5b3a73744aae.x826e5d374a1e5ab9(String x8b1d9e3189e6e73d)
   at GBPVRX2.xdd215986d9a64c86.PlayAudioFile(String filename)
   at BGowland.DvbtrLib.DvbtrClient.Play2(String LCN, Boolean UseLivePlayback) in C:\Documents and Settings\gbpvr\My Documents\Visual Studio 2005\Projects\DVB-T Radio\DvbtrLib\DvbtrClient.cs:line 206

The relevant code...

Code:

if (!UseLivePlayback)
{
    Log.WriteLine("Invoking PlayAudioFile() for " + gbRecordingsDir + BufferFile);
    PluginHelperFactory.getPluginHelper().PlayAudioFile(gbRecordingsDir + BufferFile);
    Log.WriteLine("PlayAudioFile() invoked.");
}

The playback graph is built and runs correctly and the gbnetradio-X.mp3 file is created and can be played using an external media player.

Drive I: is a local NTFS drive and the folder is the user's normal GB-PVR recordings folder. The OS is Vista but I know of at least two Vista users who don't have problems. What could be the reason for an 'Object reference not set...' exception with PlayAudioFile()?

Cheers,
Brian

[sub]

First thing I'd get them to try is taking a copy of the .mp3 file (so its not "in use"), then run graphedit and try using the "Render media file" option to see if they end up with a graph that can play.

Other than that, can you get them to post a set of lots?

[bgowland]

Thanks - hadn't thought of rendering the mp3 to what the graph looks like.

I'll ask him to do some more tests and get another set of logs.