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Reply
Hiker
Posts: 6
Accepted Solution

Hero 7 raw audio

Hello everyone,
i just got my hero 7 black and I’m having some difficulties to understand the differences between the raw audio settings. I carefully read the gopro manual but I still can’t get there.

I did some test but the only thing I understood is that the “low mode” records a very very low audio track (maybe a bug?) compared to medium and high setting.

I can’t really hear a noticeable difference to each setting (off, low, medium or high), so my question are:

- Is there any quality difference between “off” and “high”? Or the only difference are the information the track get and how much you can push the audio track during post production?

- Can someone please explain (better than the gopro manual) what actually are the differenxe between low, medium and high and the pro and cons of each one?

- What are the pro and cons of “wind mode” and “stereo mode”? Besides of course the obvious wind noise reduction. What technically happens to the mica when the wind mode is on? Has the wind mode any cons compared to stereo mode?

Thank you,
Davide

Accepted Solutions
Explorer
Posts: 11,998

Re: Hero 7 raw audio

The difference begins with .wav vs in video audio. There audio recorded in the video is lossy (compressed) while the .wav audio are in a format that can cover full frequency and are uncompressed (when Low is selected). Additionally, the video audio will have a good amount of processing done to it – auto gain control (AGC), wind reduction (if manual audio control is turned off), and more. In the Protune (Raw) audio you are selecting how much you want applied.

Next comes processing. Audio files require boosting in an editor (raising db) as no audio gain is applied automatically.

Low: Applies minimal processing to the audio file. Saves a .wav file with 3 separate audio tracks – one for each mic on the camera.

Medium: Applies some processing, including your manual audio choice if enabled (stereo or wind).

High: Fully processed audio (matches the audio that you’ll find attached with your video – but higher quality).

Third, yes, when Auto is selected (vs wind reduction or stereo only) the camera will try to adjust during the recording. Sometimes it gets this wrong and you can get silent moments or drops in audio. If you use this option, selecting to have a Low audio backup.wav backup file is desirable (although you will need to be able to edit the audio to increase the audio gain).

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All Replies
Hiker
Posts: 6

Re: Hero 7 raw audio

 
Adventurer
Posts: 9,692

Re: Hero 7 raw audio

[ Edited ]

Do my best for a Kuddle (High five) here:

 

Hero 7 black Protune must be "On" and a  audio  raw file chosen.  GoPro  now will  make an original video with sound, and a.WAV file.  In an Editor if Sound, video or other, you minipulate your .Wav file and completed, mute the video and add in  to your project.  Done.

 

Differences:

 

Not a Single thing at all but High being the Norm, medium just backing down a few Db, and Low the same. off Simply no .Wav file made. 

The Pro of it better sound.  The con of it using your sdxc  storage space up. Another Pro of it with the promic adapter the best sound you can get from any type of mic, 

 

Manual or auto  mic settings like Wind, Sterio, Ext mic standard and powered mic,    says all that. in wind you either use Auto, if you feel  ifto windy set to wind only.  but the real question is how many  tracks are there , three  left and right and wind track  so does wind now become a single track or two track mono and mono???

 

 a lot can be said that gopro does not want to share  or can overfill us with the info we need.  that is my take on this

 

 

BUMP answer please, we are not instant robots here , so if gopro can not chime in or another member they will, if it relates to them or not    

 

 SMILES

 

FISH

Hiker
Posts: 6

Re: Hero 7 raw audio

I see, thanks!

 

After some tests I figured out that "low" compression makes 3 audio tracks, while "med" and "high" compression makes only 2 audio tracks.

 

Low compression definitely needs to be gained a lot during audio post production (about 40db or more) but, in my opinion, it has a much better audio compared to "med" and "high".

 

I actually can't hear any noticable difference between "med" and "high" compression, at least not after the tests I did.

 

I would like to understand what actually are the technical difference between the 3 modes.

 

And another question I have is: when the GoPro is set to auto mic (stereo/wind), is it changing that option during recording or it records the whole clip with the starting option it choose?

 

Does someone has the answer to that?

Adventurer
Posts: 9,692

Re: Hero 7 raw audio

Fast answer is use a fan on it.

Explorer
Posts: 11,998

Re: Hero 7 raw audio

The difference begins with .wav vs in video audio. There audio recorded in the video is lossy (compressed) while the .wav audio are in a format that can cover full frequency and are uncompressed (when Low is selected). Additionally, the video audio will have a good amount of processing done to it – auto gain control (AGC), wind reduction (if manual audio control is turned off), and more. In the Protune (Raw) audio you are selecting how much you want applied.

Next comes processing. Audio files require boosting in an editor (raising db) as no audio gain is applied automatically.

Low: Applies minimal processing to the audio file. Saves a .wav file with 3 separate audio tracks – one for each mic on the camera.

Medium: Applies some processing, including your manual audio choice if enabled (stereo or wind).

High: Fully processed audio (matches the audio that you’ll find attached with your video – but higher quality).

Third, yes, when Auto is selected (vs wind reduction or stereo only) the camera will try to adjust during the recording. Sometimes it gets this wrong and you can get silent moments or drops in audio. If you use this option, selecting to have a Low audio backup.wav backup file is desirable (although you will need to be able to edit the audio to increase the audio gain).
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Explorer
Posts: 11,998

Re: Hero 7 raw audio

Oh, and another benefit of the Low backup audio is combining the three files and having the ability to give priority of one (or two) mic(s) over the other(s).
Hiker
Posts: 6

Re: Hero 7 raw audio

Well, thanks a lot Danielr for all those infos, that really helps!

 

The very last question is:

 

- the wind/stereo option won't work on the Low Compression Wav Track because is already recording the best audio possible?