Audio has changed when imported.

Roger-Hall wrote on 2/10/2020, 12:52 AM

OK... I import an ordinary audio track -16bit 44.1kz.... no problem. But it doesn't sound the same as the original audio trk. It sounds compressed and as if the left and right channels have been 'truncated'. The only thing I've been able to spot is on object properties where it states.....'Import Module: Internal RIFF Import' Is that the cause of the compression and if so, can it be bypassed?

Comments

me_again wrote on 2/10/2020, 2:54 AM

Aah. You've fallen at the first hurdle with this one. As far as I know there is no such thing as " an ordinary audio track".

Is it a WAV, AIFF, AU (audacity), PCM, FLAC, APE, M4A, WMA, MP3, OGG, AAC, ATRAC (Sony?) to mention a few propriety types off the top of my head.

Of those I've just listed MEP only really likes a few, the rest it will either convert to WAV then import or give up completley saying it can't be imported.

AndyW

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emmrecs wrote on 2/10/2020, 3:55 AM

@Roger-Hall

In addition to what @me_again has written, it is very useful to we fellow-users, when attempting to offer advice, if you supply the full details about your computer, version and variant of MEP, etc., as detailed in this pinned post.

As to your question: 44.1kHz sampling frequency may be, at least partially, the cause of problems; MEP will normally expect 48kHz. The use of the particular import module should have no effect on the file, in normal circumstances, but we would need to know the answer to the question @me_again posed, along with some indication of exactly where this audio track came from.

It might also be helpful if you were able to describe in more detail what you mean when you say that playback sounds "compressed" and "truncated"

Jeff

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Roger-Hall wrote on 2/11/2020, 2:27 PM

OK.... the imported audio file is 32bit, 44.1khz WAV. I am a recording studio engineer. I have also rendered files @ 48kHz - same result. Magix seems to compress and change (somewhat significantly) the audio files I put into it. Computer = Dell, Intel i5 CPU@ 3GHz *GM RAM 64 bit - all good. Here's the thing, I have MEP installed here in the office and in the studio, my playback systems are in the state of the art realm. ($25K +). It seems MEP takes the audio file and somehow compresses it. Which is OK, - I believe it's doing it as a memory compensation deal? But it's when it render's is back - that's the problem.... it's almost like it's re-compensating for what it did in it's program. The rendered audio file is not the same as the original. It's pretty close, but not the same. On one of the experiments the audio file was changed with left and right channels 5 to10% increase in volume with the center down by the same amount. Compressed and truncated. Almost like it's encoding for a surround sound or something. I've checked everything. Vegas and other programs don't exhibit this change in audio quality. Have I initiated an algorithm on mixdown (rendering)?. Also, 10 to 20% of bass is lost whilst editing but then when rendered back, the missing volume is restored but with 10 to 20% less fidelity.

My next step is to go ahead and actually publish the video but in a private domain then listen to it played back on various systems. I love MEP but this audio 'algorithm or compression' problem is very disappointing.

I have been mixing and making music videos for over 20 years.

johnebaker wrote on 2/11/2020, 3:01 PM

@Roger-Hall

Hi

. . . . the imported audio file is 32bit, 44.1khz WAV . . . . I have also rendered files @ 48kHz - same result. . . .

IMHO the bit depth is the problem - Movie Edit Pro is reducing the bit depth to that which is compatible with the video exports formats capabilities, in most cases this will be 16 or 24 bit, depending on the export audio encoding format, and 48/96/192 (max) kHz sample rate depending on the video export format and/or internal audio codecs used, thus altering the audio characteristics cf the 32 bit source files.

For video, the standards specify the following audio encoding bit depths:

PCM - 16 or 24 bit

DTS - 24 bit only

AC3 - 16 bit only

HTH

John EB

 

 

 

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Roger-Hall wrote on 2/11/2020, 8:43 PM

Many thanks to John.... I'm going to master the audio file again... in 16 bit (PCM) 44.1Khz and match the video to time... and then render and see what happens. Many thanks to all... Roger.