|
|
| y0shi |
| Posted: Aug 29 2014, 04:21 PM |
 |
|
Newbie
Group: Members
Posts: 1
Member No.: 38239
Joined: 29-August 14
|
Hi,
Im currently trying to record a guitar video for youtube and read about Virtualdub somewhere, and so far I really like it. Let me explain my setup first:
I use a Guitar Interface (Line6 UX2) to get my guitar into the computer. Then I record the video/audio with VD. Unfortunatly It seems to be impossible to record the guitar and the backing track running on my pc, so what Im trying to do is this: Run the backing track in audacity and record my guitar there AND in VD. Once Im done I rip the audio from the video and open it in audacity and replace it with the higher quality recording that was done IN audacity. But whenever I try to do this the result looks like this:
http://imgur.com/ud8wPkd
The bottom track is the one created in VD. Although the tracks seem to be the same, the one from VD seems to be faster and since audio and video are still synced I assume the entire video isnt recorded in real time? How do I fix this? Or is there anything else I dont get? I dont know too much about video/audio capturing so maybe Im making some fundamental error? 
Thanks for any advice |
|
| raffriff42 |
| Posted: Aug 29 2014, 05:36 PM |
|
|
Advanced Member
Group: Members
Posts: 384
Member No.: 35081
Joined: 25-June 12
|
I don't know a lot about capturing with VirtualDub specifically, but is looks like VD is dropping frames during capture. This is typically due to:
* attempting to capture at too large resolution or too high frame rate.
* not compressing video (= huge files) or using a slow compression codec
* compression codec does not support null frames? (hint: use Lagarith)
* slow disk drive or lack of free space
* generally underpowered computer
There may be other VD-specific tricks for better capture, I don't know.
If you are still dropping frames after trying everything else, you will have to time-stretch the video to match the audio duration (or shorten the audio, but IMHO this is a bad idea for high fidelity audio). I would point you to an Avisynth solution here, but others may have better ideas. |
|
