Mp3 audio repeating at split

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  • Updated 4 years ago
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When working with a provided mp3 file, I am having an issue when adding a split to adjust timing. The audio "repeats" or glitches after the split.

It's not all mp3 files, just ones recently provided so I'm trying to troubleshoot the difference. The mp3 was recorded as an .aiff file and then converted to an mp3 after editing. Would that cause these issues? I'm including a link to a screen capture below to demonstrate what I'm talking about.

https://psu.app.box.com/files/0/f/3186728635/1/f_28854598478

Not shown in the video but related... when I play the video in Camtasia with the mp3 file, then try to go back on the timeline, the audio also goes out of sync. I am not experiencing any of these issues when I convert the same problematic .mp3 file to a .wav. Thoughts? I'm guessing it has to do with some export setting on the mp3.
 
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Courtney Wozetek

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Posted 4 years ago

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Timbre4, Champion

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Hi,

I'd look at the sample but its asking for a log in or join up as I'm not part of Penn State.

"Adding a split" does this mean you've extended a frame for time? Are you treating the mp3 audio as a separate track?  If you're cutting the mp3, you may have created a second instance of the sound in question. (need more details)

EDIT: If WAV works properly, just go with that. At the end of the production it's all going to be rendered to mp4 or whatever anyways.

(Edited)
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aureliaandrewsb

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If you have the need to split audio or video file, you may follow this guide at split MP3 into seveval tracks

This guide also can split AIFF, Apple Lossless ALAC, FLAC, APE, M4A, WAV, AAC, WMA, M4B etc.

It also can split video MP4, AVI, WMV, MKV, MOV, MPG etc

It even can merge audio files into one, increase audio volume, change audio channel etc

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Courtney Wozetek

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I literally click on the audio and clicked the "split" button, nothing more. When I do the same to the .wav file, the repeat does not happen. It is on a separate audio track.

I've adjusted the file privacy for the link and you should be able to see the video now. Sorry about that!
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Courtney Wozetek

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EDIT: If WAV works properly, just go with that. At the end of the production it's all going to be rendered to mp4 or whatever anyways.

This is my workaround. But I am paying someone to provide me narration, and it is supplied as an mp3. I don't want the extra steps of having to convert the file is there is a simpler solution within Camtasia.
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Timbre4, Champion

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Still asking for credentials. This appears to be a glitch with specific mp3 files and not a process to be addressed.

If your narration talent is working (MAC) AIFF, they should be able to convert them to WAV outputs and provide these better quality clips to you I'd think.  

(Edited)
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Robert R., Online Community Admin

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Hello, Courtney;

This is common with variable-bitrate MP3 files, would your MP3 file happen to be variable bitrate? We do recommend working with 16-bit WAV files as they are more stable in Camtasia. If possible, you may want to try requesting constant bitrate MP3 files (or, better yet, 16-bit, 44.1 kHz WAV files) from the content creator, as that may likely address your issue.
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Courtney Wozetek

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Still asking for credentials. This appears to be a glitch with specific mp3 files and not a process to be addressed.
Weird. One last attempt.
https://psu.box.com/shared/static/jd8nesurzvhuvn6dt1z3o4xbcb10wt0u.mp4

I guess a better question would be, are there specific mp3 export settings that are ideal for editing in Camtasia?
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Courtney Wozetek

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Thanks Robert. Those specs are exactly what I needed! I will ask about variable vs. constant bitrate. Sounds like that may be the underlying issue.

Appreciate the quick and helpful feedback!
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Timbre4, Champion

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Got it! Good job capturing the issue. Here's the deal...

MP3 #1 is a variable bit rate file; these are fine if used standalone and you don't monkey with them. All WAV files are constant bit rate and MP3 #2 is constant bitrate because it behaves properly.

If you REALLY need this clip you should be able to use an audio editor to convert it to constant bitrate or just do as you're doing with WAV.

Tell the source to NOT record variable bit rate in the future or resign yourself to converting any of those you need to edit.

EDIT: variable bitrate video is even worse. :)



(Edited)
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Courtney Wozetek

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EDIT: variable bitrate video is even worse. :)
Thanks for the heads up. I'm sure I'll run into that at some point too and get just as frustrated! Appreciate the help!
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Timbre4, Champion

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As a rule, I convert my iPhone videos to constant bitrate before bringing them into an editing project and then it's smooth sailing.

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