Chain help - bit rate change

[edmund10]

Another quick question

Id like to have a chain in which I use Amplify (-2.0db), then Export to Mp3.

When I export I get the error in the attached screenshot.

How can I prevent this?

Can I add a command to the chain that would automatically resample the project at an appropriate level prior to exporting to MP3?

Thank you

[steve]

Do you really want to export at 24 kbps? That is an extremely low quality format.
Audacity does not have "resample" as a Chain command, so probably the easiest way (if you really do want 24 kbps MP3) would be to export from Audacity in WAV format, then use a third party batch converter to encode the files as MP3.

[edmund10]

Thank you -- do you all recommend any third party ogg--> mp3 converters for Mac?

[Gale Andrews]

Go to the Import / Export Preferences and enable "When importing... normalize all tracks." Import or generate some audio (anything will do) then open Effect > Normalize, set Normalize to - 2 dB (other boxes unchecked), then run the effect. You may want to turn off "Show Metadata Editor" further down the Preferences.

Now you can import as many files into the project as disk space allows using Import > Audio, change the project rate bottom left of the window to 24000 Hz, then File > Export Multiple.

I'll add your vote for chains allowing choice of export sample rate.

Thank you -- do you all recommend any third party ogg--> mp3 converters for Mac?

The problem is that most batch encoders require you to use the command line which you may or may not be comfortable with - for a command line application you could try http://sox.sourceforge.net/ (you have to add the libmp3lame library).


Gale

[steve]

If you're comfortable using the command line you could use SoX.
I don't use Macs, so I'm not the best person to ask, but I think iTunes can encode MP3s. I don't know if it supports OGG, but you could use Audacity to decode the OGG files to WAV or AIFF, then iTunes to encode them as MP3.
If your original files are low sample rate OGG files, then you will probably be able to do the whole thing in Audacity, but you've not really said what it is that you're trying to do.

[Gale Andrews]

Yes you could batch-convert OGG files to MP3 in iTunes. You will have to add OGG support for Quick Time:
http://wiki.audacityteam.org/wiki/Expor ... l_files.29 .

Then drag the files into the Music window and set the "Import Settings" at iTunes > Preferences to MP3. Then select all the files, right-click and convert to MP3.

You can batch convert WAV to MP3 in iTunes too but you can't normalise/amplify hence I didn't mention it.



Gale