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Forum: VirtualDJ Technical Support

Sujet Video files without Audio slow to scan

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Hi,

when I load a video track without audio the background scan of the file is incredibly slow as opposed to one that has audio.

I know the chance of doing this is rare but I thought VDJ would be smart enough to work out there is no audio track and process a whole lot quicker.

It's really slow!!!


 

Posté Tue 31 Jan 17 @ 11:56 pm
AdionPRO InfinityCTOMember since 2006
How do you know it is scanning, and why does it matter how slow it is, since there's nothing to be gained from the scan anyway
 

Posté Wed 01 Feb 17 @ 1:30 am
Adion wrote :
How do you know it is scanning, and why does it matter how slow it is, since there's nothing to be gained from the scan anyway


I know it is scanning as you see the solid waveform make it's way across the display.

It's probably nothing but it does worry you when you see it slowly crawling across the screen

If there is nothing to be gained from scanning the file why does VDJ even do it?
 

Posté Wed 01 Feb 17 @ 8:55 am
PachNPRO InfinityMember since 2009
I don't think it has something to do with if there is audio in the video file or not.
I get that sometimes too but I have not the slightest idea why it happens, when it happens and how to solve it.

It suddently can happen and a track that normaly loads within 2 or 3 seconds takes up to ~1 minute until the complete waveform is loaded.
It is completely random.

But I have the feeling it is more likely to happen if you switch between different songs on a deck while the wave of the tracks are still loading.
I think the loading time adds up somehow and at one point it is just too much.

 

Posté Wed 01 Feb 17 @ 9:47 am
PachN wrote :
I don't think it has something to do with if there is audio in the video file or not.
I get that sometimes too but I have not the slightest idea why it happens, when it happens and how to solve it.

It suddently can happen and a track that normaly loads within 2 or 3 seconds takes up to ~1 minute until the complete waveform is loaded.
It is completely random.

But I have the feeling it is more likely to happen if you switch between different songs on a deck while the wave of the tracks are still loading.
I think the loading time adds up somehow and at one point it is just too much.



This is how it behaves :


 

Posté Wed 01 Feb 17 @ 2:06 pm
PachNPRO InfinityMember since 2009
Oh okay... that is completely different from my issue.

Because yours in none.

You won't see the wave, because there is no wave.
The wave represents the frequencies and their amplitude in an audio track and since there is no audio in your video file there is no wave.
Does this make sense to you?
 

Posté Wed 01 Feb 17 @ 2:28 pm
PachN wrote :
Oh okay... that is completely different from my issue.

Because yours in none.

You won't see the wave, because there is no wave.
The wave represents the frequencies and their amplitude in an audio track and since there is no audio in your video file there is no wave.
Does this make sense to you?


Yes you are correct a "non-issue" - but odd all the same.

EDIT: I have just noticed that the waveform does not scan along until you press play
 

Posté Wed 01 Feb 17 @ 3:46 pm
AdionPRO InfinityCTOMember since 2006
It is not 'scanning', it is playing. The red shade simply indicates the position in the file.
So obviously it will move at the speed of playback :p
It's the same with files with audio, the red shade will also move at the speed of playback, since that's what it indicates.
 

Posté Wed 01 Feb 17 @ 5:39 pm
Adion wrote :
It is not 'scanning', it is playing. The red shade simply indicates the position in the file.
So obviously it will move at the speed of playback :p
It's the same with files with audio, the red shade will also move at the speed of playback, since that's what it indicates.


ahhh gotcha - that explains everything - my misunderstanding - thank you.
 

Posté Fri 03 Feb 17 @ 2:00 pm


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