Why do stereo and mono mp3 exports have the same file size?

Forum|Forum|4 years ago
November 1, 2021
1 reply
3058 views

My podcast is in video format, that's why I edit it in Premiere Pro. But I also want to export the audio-only version in mp3 format. The easiest way for me to go about this is to do it right from Premiere Pro. I want to use mono sound because of the smaller file size. But for some reason, mono and stereo exports both have the exact same file size. Why is that?

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Correct answer Averdahl

But for some reason, mono and stereo exports both have the exact same file size. Why is that?

By @Florian Walther

The bitrate specified is per file and not per audio channel.

Averdahl

Correct answer

Community Expert

But for some reason, mono and stereo exports both have the exact same file size. Why is that?

By @Florian Walther

The bitrate specified is per file and not per audio channel.

F

Florian WaltherAuthor

Known Participant

I'm sorry but I don't know what to do with that information. How does this relate to the mono/audio file size?

Averdahl

Community Expert

I'm sorry but I don't know what to do with that information. How does this relate to the mono/audio file size?

By @Florian Walther

When you export a stereo files, two channels, and set the bitrate to 128 the file will be let´s say 50 MB. If you now export a mono file, one channel, and use the same bitrate, iow 128, the file will still be 50 MB.

The resulting file size is not tied to either mono or stereo. The resulting file size is tied to the bitrate used upon export. If you want a smaller file, lower the bitrate.

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