HOW ? Avi file sound out of sync ! HOW!

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garjobo123
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HOW ? Avi file sound out of sync ! HOW!

Post by garjobo123 »

Im regretting already asking as - if anyone does bother to reply -the reply no doubt will be long-winded- and impossible to followed coupled with just not being able to be done.

HOWEVER,

I have a couple of short clips taken by a muppet no doubt in portrait mode on a ailing phone. They are avi files. The sound is out of sync. How in Gods name can I use these clips in the wonderful programme that is VS!

Thoughts, answers on a postcard, more than welcome.

( I can obviously split the sound...BUT....the clips ( I assume partly because AVI..as my oher mp4 clips etc are ok ) means the clips are jumpy / fine when rendered..but to edit a nightmare - YES! I'll answer the obvious first..i have smartrender on and as per the norm think it does nothing! ) ..SO..I cannot align the split sound with the clips because the clips are jumpy as I say / frames missing as I playback or whilst I try to edit..impossible to match up the sound.

...Convert the clips to MP4 and then bring them back in..you say? you think? wouldn't that alter the quality?

My PC...shouldn't be doing that you say? up the RAM? Well it handles other larger clips etc

AGAIN, thanks for passing by. I too will pass by this thread from time to time to see if a response has been written - a useful one which magically works!
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Davidk
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Re: HOW ? Avi file sound out of sync ! HOW!

Post by Davidk »

Various comments in your plea suggest that the original clip is HD and you are trying to edit it without a proxy file: which gives a very jumpy video and altho the audio seems unaffected by the jumps it is out of sync with the image. Smart proxy is an alias name for a lower resolution file of an HD clip that enables editing easily: any edits applied to the proxy file are applied to the original when it gets rendered.
So,
I suggest 2 things:
1. turn smart proxy on (settings/preferences/performance tab), and adjust the resolution you want it to begin with (the default is mpg normal/DVD quality; smart proxy any clip with a resolution above that) and make sure you have enough storage space wherever you choose to store the proxy files.
2. load the clip in the timeline. The first time you do this, the proxy file auto create and will usually take a minute or 2 to create (large clips -->> long creation time) but when it's done a small keyboard-like icon will appear in the timeline thumbnail of the clip. The second time, however, if the proxy folder is not on your internal PC store, you may have to re-create the proxy file manually (rt-click the clip, choose create proxy file from the context list). Once the proxy file is available you will find that the normal editing processes are no longer jumpy and the audio should be in sync with the image.

Why is it like this??
a. the existence of a proxy file for a clip is marked in the project file (vsp) by filename folder etc. Opening a vsp will find it. If however the proxy file does not exist or VS cannot find it - you don't get a message but playing the timeline clip gets you jerky performance again, and you will notice that the icon is missing from the thumbnail.
b. the proxy file is specific to the PC configuration and vsp you created it for: copying to another PC simply doesn't work. Trying to use the same proxy file for the same clip used in a separate vsp doesn't work either (complained about, not fixed).

Cautions
c. If you use an external device (usb stick, SD card) as the location of the proxy folder, make sure that the device is plugged in BEFORE to the same connector - a different one changes the drive descriptor - you start VS. Part of the start process is a check of the proxy folder - is there are proxy file there but the source vsp cannot found (does not have to be loaded in a timeline, just not existent where the proxy identity says it should be), if so the proxy file is deleted (vsp not there, proxy file taking up space when not wanted, ergo erase it). In this case, re-creating proxy files for a well-developed vsp that you moved as part of a smart package can be time consuming and irritating.
d. proxy files are not included in a smart package of a project file (complained about, not fixed).

Lastly, converting an avi file to mpg or mp4 does not impact on the sound quality you hear - there is inevitably some degradation, but inaudible to the normal ear. Doing this however will save you bundles of disk storage space.
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