Directshow MP3 File Writer filter?

[bgowland]

I'm trying to put something together to record audio to MP3 files I'm using the default DirectShow File Writer which connects OK to the LAME Encoder output (viewing the Remote Graph with GraphEdit during a debug session) but I get 0KB files when I run it.

If I save the graph from the application and open it later in GraphEdit, the file writer is always disconnected and I can't manually reconnect (the filters couldn't agree on a connection type error) - not sure how I get it to connect programmatically. If I alter my code to use IPin.QueryAccept I get an HRESULT of 1 which I believe is S_FALSE (all definitions of S_OK I can find are for 0).

So what I'm asking (in my usual concise way ) is - what sort of file sink can I use to record the MP3 output of the LAME encoder?

Cheers,
Brian

[sub]

The default File Writer filter should work fine as an output for the LAME encoder. You could always try connecting the "GB-PVR Writer" filter to check.

The problem is probably occuring somewhere further upstream.

[bgowland]

The default File Writer filter should work fine as an output for the LAME encoder. You could always try connecting the "GB-PVR Writer" filter to check.

The problem is probably occuring somewhere further upstream.

Thanks. I'm seeing two things - if I take the saved graph and try to connect the GB-PVR Writer, I get the same error which suggests you are right about an upstream problem.

If I build the same graph by hand in graphedit, the GB-PVR Writer connects and records to file. If I try the default writer though, it still won't connect to the LAME Encoder.

I took the LAME encoder out and I can connect a GB-PVR Writer directly to the audio decoder PCM output but can't do the same with the default writer.

Something broke the default writer??? GraphEdit shows it as qcap.dll - not sure if that's right.

I did try the GB-PVR Writer programatically but couldn't figure out how to set the filename. With the default writer I cast to an IFileSinkFilter to use its SetFilename method but that didn't seem to work for the GB-PVR Writer - is this a 'trade secret'?

Cheers,
Brian

[sub]

I did try the GB-PVR Writer programatically but couldn't figure out how to set the filename. With the default writer I cast to an IFileSinkFilter to use its SetFilename method but that didn't seem to work for the GB-PVR Writer - is this a 'trade secret'?

That should work. Thats what I do.

[bgowland]

That should work. Thats what I do.

OK sorry. You're right. I was recounting what I'd seen at about 5am this morning when I was probabaly changing about 4 different things at the same time.

I remember now that it DID set the filename but something I did later during connection reset it to have no filename. I couldn't work out what.

Anyway - having just tried again with a drastically reworked bit of code...the GB-PVR Writer connects, retains its filename and...records. Whayha!

Many thanks - sometimes it's just a case of bouncing ideas around which helps you take a fresh look at your code. Still don't understand why the default writer isn't working though.

Cheers,
Brian