MP3 no longer playing in FCPX

I am editing my wedding video and have a mp3 for the music I am using. Took a break and came back to it and mp3 no longer playing; waveforms are still there in the timeline but the audio won't play. Even when I try to re-import the music, it doesn't play and the waveforms have disappeared, but it will play in quicktime. All other audio in the project will play. Any suggestions would be appreciated.

MacBook Pro 16″, macOS 13.2

Posted on Apr 7, 2023 6:13 PM

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Actually, MP3 files should automatically be "optimized" after import and converted into QuickTime .mov files containing 16-bit LPCM audio at the original sample rate. So, I wonder if the issue is related to the conversion, the converted/optimized file, or something else... ???


Tom's right about MP3 being a poor quality format, especially for use in editing. There are so many ways that MP3 files are encoded, it may be possible that FCP has a problem in some cases...


As Tom recommends, it's always good to convert "lower quality" audio (particularly MP3 files) used with FCP, or any NLE, into uncompressed/LPCM AIFF or WAVE 16- or 24-bit files with a sample rate of 48kHz.

Posted on Apr 8, 2023 6:48 PM

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12 replies
Question marked as Best answer

Apr 8, 2023 6:48 PM in response to Tom Wolsky

Actually, MP3 files should automatically be "optimized" after import and converted into QuickTime .mov files containing 16-bit LPCM audio at the original sample rate. So, I wonder if the issue is related to the conversion, the converted/optimized file, or something else... ???


Tom's right about MP3 being a poor quality format, especially for use in editing. There are so many ways that MP3 files are encoded, it may be possible that FCP has a problem in some cases...


As Tom recommends, it's always good to convert "lower quality" audio (particularly MP3 files) used with FCP, or any NLE, into uncompressed/LPCM AIFF or WAVE 16- or 24-bit files with a sample rate of 48kHz.

MP3 no longer playing in FCPX

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