No audio streams exported when using Export2

[smartflutist661]

On Ubuntu 18.04, I've compiled the current alpha version (2.3.1, evening of 1/10/19) with mod-script-pipe enabled. I'm able to use almost all of the commands (that I've tried so far) successfully. However, I can't get Export2 to export with sound. I get a file output with the correct name, but a size of only a few hundred bytes (which appears to be the [correct] metadata, as it shows up with mediainfo), and no audio streams. No window appears to show export progress in the program. Using the Export dialog I can successfully export with the same track, name, etc.

Here's the command I'm using:

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Export2: Filename=test.m4a NumChannels=2

[steve]

On Ubuntu 18.04, I've compiled the current alpha version (2.3.1, evening of 1/10/19) with mod-script-pipe enabled.

Congratulations.

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Export2: Filename=test.m4a NumChannels=2

That "should" fail. The filename needs to include the full path, so something like:

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Export2: Filename=/home/smartflutist/Music/test.m4a NumChannels=2

Also, there could be a problem with m4a export, depending on the build of FFmpeg. I'd suggest testing it first with a format that is natively supported by Audacity (such as WAV).

[smartflutist661]

Thanks, it helps actually... you know... following the instructions.

A bit more testing showed me the issue.

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Export2: Filename=test.m4a NumChannels=2

doesn't fail, it just saves the file wherever you are running Audacity from (of course, I expect there would be potential permissions issues, but not likely to be a problem for self-compiled). However, a previous command de-selected all of the tracks in my project, so the export was doing exactly as I asked and exporting exactly nothing. Adding

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SelAllTracks

or whatever is appropriate before every export is the safe way to do it.

[steve]

I expect there would be potential permissions issues

Yes, I expect so, though I've not actually tested that on a fully installed version on Linux.
(my test version of 2.3.1 is within my "home" user space.)

so the export was doing exactly as I asked and exporting exactly nothing

Glad you found it - that could have kept us going for a while.