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CFA files are always invalidated and generated again when audio preview is rendered

Explorer ,
May 23, 2024 May 23, 2024

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I have 3 CFA files totaling 400GB that are constantly regenerated without the original audio file being modified. I need to render audio to show the waveform of my sequence. Regenerating these files takes a lot of time without any obvious reason. Is this normal, or am I missing something?

 

Thanks

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correct answers 1 Pinned Reply

Adobe Employee , May 23, 2024 May 23, 2024

Thanks Falk, and thanks Vitoldk!

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Adobe Employee ,
May 23, 2024 May 23, 2024

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Hi,

cfa files are generated in various workflows. Is my guess correct that this is conforming audio when importing files?

- Which format is your media you are seeing the problem with?

- Which version of PPro are you running?

- Do you use a regular PPro project or Team Project?

 

Thanks

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Explorer ,
May 23, 2024 May 23, 2024

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Hi,

the cfa are generated once at importation time yes.

but, i have a 3 levels nested sequences. the sequence structure is like that "yt short" > "10 traks" > "rush".

for some reasons the waveform is not shown on the "yt stort" sequence, so I render the audio with the menu "Sequence -> Render Audio". Some times it's super quick taking only a few seconds with the progress bar showing me the progress, and some times the dialog box don't show any progress and the cfa file get regenerated. The original audio mov files are never modified or worked on.

 

- the audio files are mov files with 10 autio tracks compressed with AAC codec.

- version is Premiere Pro beta 24.6.0.001

- it's a regular project and all files are stored localy.

 

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Explorer ,
May 23, 2024 May 23, 2024

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The wavesforms were showing correctly, then I closed Premiere to do a windows update

 

Capture d’écran 2024-05-23 183533.png

 

when I opened the project again, the wavesforms were gone:

Capture d’écran 2024-05-23 183616.png

 

Capture d’écran 2024-05-23 183652.png

 

the menu "Clip -> Generate Audio Waveform" is doing nothing, so I choose "Sequence -> Render Audio" and the CFA is generated again.

Capture d’écran 2024-05-23 183741.png

Capture d’écran 2024-05-23 183805.png

the source files are unmodified since 2023

Capture d’écran 2024-05-23 184753.png

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Explorer ,
May 23, 2024 May 23, 2024

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it took about half an hour to generate the file again, same size as the previous one

Capture d’écran 2024-05-23 191217.png

 

and the waveforms are back

Capture d’écran 2024-05-23 191252.png

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Adobe Employee ,
May 23, 2024 May 23, 2024

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Thank you for the details!

Premiere Pro has limited support for rendering waveforms of nested sequences. E.g. as soon as the nested sequences contains a clip with an audio effect or has any keyframes applied, the waveforms of the nested sequence is not displayed anymore.

 

The workaround you are applying though should be working across restarts of Premiere Pro. We will write a bug on this.

 

Thank you for reporting!

-Falk

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Adobe Employee ,
May 23, 2024 May 23, 2024

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Thanks Falk, and thanks Vitoldk!

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