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How to record video and playing and backing track?
How to record video and playing and backing track?
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HarpNinja
2893 posts
Nov 12, 2012
5:42 PM
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How do I use an external mic to play to a backing track while making sure it is mixed ok and works with my webcam? I have a HP Pavilion dm4 with Windows.
I have an external recording interface and a webcam on my computer.
Thanks!
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Mike
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Komuso
102 posts
Nov 12, 2012
6:53 PM
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Are you streaming live or editing in post?
ustream etc let you select the audio input independent of the webcam, so you can mix in a DAW and use the master out as the audio input for the webcam.
Reaper is a great free/cheap DAW.
Reaper Video Support
Set up a reaper project with one track as the backing, one track as mic input, mix/master to output.
If post you can just record the webcam video with some obvious cue to match up the master track to the visual as per the links in the above reaper video page.
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Paul Cohen aka Komuso Tokugawa
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Last Edited by on Nov 12, 2012 6:53 PM
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HarpNinja
2894 posts
Nov 12, 2012
7:44 PM
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I'd be fine doing it live after checking levels. Will using ustream let me save it for Youtube? I know nothing about this stuff.
I can use Reaper and Audacity ok, though.
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Mike
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nacoran
6191 posts
Nov 13, 2012
1:09 AM
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There are a few possible ways to do that. In Audacity there is a checkbox that lets you toggle whether you want a track to play audibly while you record or not. (It's 4 am, which is late even for me, and for the life of me I can't find that button right now, but it's there).
Once you have that you have a couple options. You can play it out through headphones and, as long as you have your latency set right, record everything else using a regular USB microphone or whatever into Audacity. As long as you've adjusted your latency they'll line up okay. Alternately, you could run it out through the speakers and use a room mic to record everything. You'd probably end up muting the 'backing track' since it would now be recorded on the main track.
Using Windows Movie Maker you can then synchronize the audio you've recorded with any video you recorded. As long as you recorded both at the same time you can, in theory, synch them up with a little tweaking. I haven't tried synching to something that has to match perfectly like lips moving on a vocal, and I've seen some people on YouTube screw it up so it all looks like a redubbed martial arts movie, and for some reason people on YouTube will suddenly start accusing you of faking it, so make sure you get it lined up perfectly!
I assume the reason you don't just record with the camera and the backing track playing over speakers is sound quality.
Wow. How did it get to be 4 am, and where is that silly toggle?
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Nate
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HarpNinja
2895 posts
Nov 13, 2012
7:01 AM
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I get what you're saying about Audacity, and I get how to do that. I also know how to set-up an external mic for use with a webcam.
I can upload a backing track into Audacity and record a separate track/overdub without a problem (usually, lol).
What I don't know how to do is do them simultaneously. I think that is what most people are doing on YT, right? I definitely don't want to mic a speaker. I want to record the audio - a mic and backing track - direct while the camera is on.
Thanks!
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Mike
OOTB Harmonica Price List
VHT Special 6 Mods
Note Layout Comparisons
Quicksilver Custom Harmonicas (Updated 10/25/12)
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nacoran
6194 posts
Nov 13, 2012
1:25 PM
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I misread that and had it just about backwards. I haven't done this myself, but here is how I'd try it. What I'd do is to mix them together afterwards. It gives you full control over the audio.
Start your external recording first (and end it last), then start your webcam. Make sure your webcam setup is recording audio too. It doesn't have to be great quality, but you'll need it for reference. Make a reference sound, a clap or something.
Save your audio/visual on your computer, then import your external audio into the computer. Import both tracks into the same Audacity file, labeling them, and compare them. Look for the spike of the hand clap (or whatever sound you made for a reference). Figure out how much offset there is between the two recordings and trim the external audio (which you started first and ended last), using the clap to line them up. First delete enough of the external track to make the claps line up, then trim any excess off the end of the external track. Don't trim any of the internal audio. You are using it as a reference. Your external track should be exactly the same length now as your internal audio track started out, and should therefore be exactly the same length as your video.
You can now export the external track only. Mute the original audio in the video in Windows Movie Maker (or whatever video software you are using, but Windows Movie Maker is free!) Import the new audio. Theoretically, the new, higher quality audio should line up exactly. Theoretically.
I've never actually done this with video. I've synced video and music, but never where it had to be exact, and I've synced audio exactly using this technique. Extrapolating though, the technique should work, and should only take a few minutes beyond the recording time, but then again, I'm an optimist.
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Nate
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eebadeeb
46 posts
Nov 13, 2012
4:02 PM
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One thing to be aware of is that backing track playback isn't always the same speed as Audacity (or whatever software you use) so that when you try to sync tracks on separate sources or source types you need to stretch or shrink to make sure you align with your starting clap and also at the end
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