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Importing WAV results in incorrect timecode and "media start" offset

New Here ,
Jan 17, 2020

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Hi,

 

I'm a developer for a company that built an Adobe extension for audio files. We have noticed a problem recently when we attempt to import WAV files into Premiere Pro. 

 

When we import a WAV file, the metadata for "Media Start" is incorrectly set. The audio file should simply start at 0:00:00, but there is an offset, in this case of 12 seconds as you can see from the photo:

Media Start set to 12 seconds on import of WAVMedia Start set to 12 seconds on import of WAV

 

The audiofile plays just fine, there is no 12 second delay, but the incorrect metadata is causing problems when we try and swap between MP3 and WAV versions (which our extension does frequently).

 

When importing the same song that has been converted to MP3, there is no incorrect offset as you can see here:

 

MP3 version with NO offsetMP3 version with NO offset

 

Here is the problem: when our extension swaps the MP3 version for the lossless WAV (essentially using the "replace footage" functionality), the metadata offset messes things up as you can see here:

 

Danger Lines from Media Start Time differentialDanger Lines from Media Start Time differential

 

So my question is: why would Premiere set "Media Start" to 12 seconds instead of 0:00:00 for the WAV file?

 

We have tried other WAVs from our library and there continues to be a weird offset, thought the actual size of the offset varies. These are simple WAV bounces from Pro Tools, so I cannot imagine we are editing the metadata in any way.

 

Any help is greatly appreciated, thanks!

The WAV file is actually a Broadcast Wave file, with start offset information in the metadata.  Premiere reads the B-Wav metadata and is doing exactly what is designed to do.  You need to either stop writing B-Wave metadata into the audio file on creation or adjust the timecode via right click,  “Modify>Timecode>Timecode…”.  Look for a setting in what ever application or device you are using to create the wave file.


When converting the file to MP3, the offset metadata is stripped out and Premiere reads it as starting at zero.  That is why you don’t see it in the MP3.

 

This can be seen in the Metadata display under “Metadata Panel>BWF Broadcast Audio Extension>Time Reference…”

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Importing WAV results in incorrect timecode and "media start" offset

New Here ,
Jan 17, 2020

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Hi,

 

I'm a developer for a company that built an Adobe extension for audio files. We have noticed a problem recently when we attempt to import WAV files into Premiere Pro. 

 

When we import a WAV file, the metadata for "Media Start" is incorrectly set. The audio file should simply start at 0:00:00, but there is an offset, in this case of 12 seconds as you can see from the photo:

Media Start set to 12 seconds on import of WAVMedia Start set to 12 seconds on import of WAV

 

The audiofile plays just fine, there is no 12 second delay, but the incorrect metadata is causing problems when we try and swap between MP3 and WAV versions (which our extension does frequently).

 

When importing the same song that has been converted to MP3, there is no incorrect offset as you can see here:

 

MP3 version with NO offsetMP3 version with NO offset

 

Here is the problem: when our extension swaps the MP3 version for the lossless WAV (essentially using the "replace footage" functionality), the metadata offset messes things up as you can see here:

 

Danger Lines from Media Start Time differentialDanger Lines from Media Start Time differential

 

So my question is: why would Premiere set "Media Start" to 12 seconds instead of 0:00:00 for the WAV file?

 

We have tried other WAVs from our library and there continues to be a weird offset, thought the actual size of the offset varies. These are simple WAV bounces from Pro Tools, so I cannot imagine we are editing the metadata in any way.

 

Any help is greatly appreciated, thanks!

The WAV file is actually a Broadcast Wave file, with start offset information in the metadata.  Premiere reads the B-Wav metadata and is doing exactly what is designed to do.  You need to either stop writing B-Wave metadata into the audio file on creation or adjust the timecode via right click,  “Modify>Timecode>Timecode…”.  Look for a setting in what ever application or device you are using to create the wave file.


When converting the file to MP3, the offset metadata is stripped out and Premiere reads it as starting at zero.  That is why you don’t see it in the MP3.

 

This can be seen in the Metadata display under “Metadata Panel>BWF Broadcast Audio Extension>Time Reference…”

Topics

Audio, Error or problem, Import

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Adobe Employee ,
Jan 22, 2020

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Not sure, but I suspect there's additional start time metadata in the file. I know Media Composer sees different start times in some .wav files than PPro does; not sure about ProTools' usage.

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New Here ,
Aug 13, 2020

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I have the same problem. Did you find a solution to this? 

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Adobe Employee ,
Aug 14, 2020

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The WAV file is actually a Broadcast Wave file, with start offset information in the metadata.  Premiere reads the B-Wav metadata and is doing exactly what is designed to do.  You need to either stop writing B-Wave metadata into the audio file on creation or adjust the timecode via right click,  “Modify>Timecode>Timecode…”.  Look for a setting in what ever application or device you are using to create the wave file.


When converting the file to MP3, the offset metadata is stripped out and Premiere reads it as starting at zero.  That is why you don’t see it in the MP3.

 

This can be seen in the Metadata display under “Metadata Panel>BWF Broadcast Audio Extension>Time Reference…”

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Adobe Employee ,
Aug 14, 2020

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If you need to change a lot of files that already have B-Wav metadata in it, you can probably use Audition to batch save the files, and uncheck the box for "Include markers and other metadata". 

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