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Old 11-23-2016, 03:56 PM   #1
vavan1
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Default Audio playback of imported video files distorted

Hi,

Wondering if anyone has come across the following problem:

When importing a video files m4v, mov, mp4 (it doesn't matter which) the playback of the resulting audio is distorted - slight clackling and voices sound slowed down (like a deep slow darth vader). The files size created is the right time length and the video plays fine. I've checked file size and potential performance issues with small files.

I went back and checked older projects with video files which used to work fine. Now when imported they sound the same slowed down distorted way.

Was thinking it must have been a frequency/bitrate problem but I've tried everything I can think of and the problem persists.

(and I checked playback rate was set it 1!).

Is there something obvious I could be missing?

I should add standard audio files run fine in the same session.

running mac book pro with Yosemite 10.10.5 with latest version of Reaper.
8G RAM

Any clues much appreciated
Cheers!
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Old 11-23-2016, 10:49 PM   #2
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Are you sure there is no re-sampling going on in Reaper ?
So for instance , source audio of the video is 48 khz and audio device used in Reaper is set at 44.1 khz in prefs ?
Re-sampling in Reaper can lead to "tearing" audio, as you describe.
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Old 11-24-2016, 08:22 AM   #3
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Thanks Vanhaze...I've tried importing at various sample and bitrate combinations but that doesn't make any difference. Begining to think its a codec problem.

I did try some m4v's taken on my iphone and they are fine.

I'm going to try older versions of Reaper and other DAW's unless there is anything else you can think of?

Cheers
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Old 11-24-2016, 08:57 AM   #4
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I think I've eventually worked it out:

I reinstalled Reaper 4 and the import worked so I looked at the default video preferences of each and noticed the following (refer to the images below).

Deleting everything apart from 'qt' in version 5 solved the problem.

hope this helps someone.

Cheers.
Vavan
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Old 11-24-2016, 09:02 AM   #5
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screenshots:
Attached Images
File Type: png Screen Shot 2016-11-24 at 16.00.09.png (38.5 KB, 374 views)
File Type: png Screen Shot 2016-11-24 at 16.00.49.png (49.3 KB, 337 views)
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Old 11-24-2016, 10:36 AM   #6
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thanks for making the problem very clear... and good to know
QT = no VLC = yes
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Old 11-24-2016, 10:49 AM   #7
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It's worth trying VLC instead of Quicktime and also moving the audio from that video clip to it's own track as a Wav, with the original audio disabled.
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Old 11-24-2016, 03:05 PM   #8
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Nice one, Cheers...I'll try VLC instead.
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Old 11-25-2016, 07:51 AM   #9
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Quote:
Originally Posted by EpicSounds View Post
It's worth trying VLC instead of Quicktime and also moving the audio from that video clip to it's own track as a Wav, with the original audio disabled.
Can you please explain how to do that exactly ?

Thx !
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Old 11-25-2016, 08:37 AM   #10
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Quote:
Originally Posted by vanhaze View Post
Can you please explain how to do that exactly ?

Thx !
I duplicate the video item on a new track
select copy and glue (this makes an audio file in the project format)

RT-Click the video item>Source properties
click ignore audio

group the two items.
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Old 11-25-2016, 04:12 PM   #11
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Quote:
Originally Posted by EpicSounds View Post
I duplicate the video item on a new track
select copy and glue (this makes an audio file in the project format)

RT-Click the video item>Source properties
click ignore audio

group the two items.
Hi Jon,

I guess i was not aware of the "glue" action for the audio on the new track, which makes the item only audio and not 'audio plus video'. (if i understand you correctly).

Many thanks for the tip !
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Old 11-25-2016, 05:23 PM   #12
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feature or limitation depending on how you look at it.

We can't glue videos as video, can't freeze tracks as video, or use subprojects with video.
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Old 11-26-2016, 03:57 AM   #13
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I've always exported and imported the audio again but this looks handy.Cheers!
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