Re: [Emc-users] Learning LinuxCNC Installation Video

[Chris Albertson]

About audio recording.  As you've figured out audio quality is more
important than video quality.  Viewers will put up with some noise in
the video but  any audio defect really stand out.  The way to do this
is

1) Get a decent external, separate audio recording device.  The
cheapest is the "Zoom H1" recorder.   These actually have decent
built-in microphones but you might want a better model, see below.

2) If recording live sound, at the same time you take the video also
use the camcorder's built-in mic.  This camera audio is used ONLY to
sync the external audio. (It beats trying to use a clap board)

3) try NOT to record live sound.  Record a voice over AFTER you edit
the video.  The voice over cane be done using several "takes" and the
best of it splice together.  No one will see your mistakes.  Start
with your face on-camera to introduce the subject that cut to the
subject and do the voice later so most of your speaking is off camera.

4) I like to apply some EQ and quite a lot of compression to the voice
over track.  Makes you sound like a professional announcer who has
good control over his voice level.  You can use software EQ and
compression.  (real hardware is just to expensive and over kill)

5) place the microphone as close as you can.  For recording voice
overs in post production I use a dynamic microphone about 8 inches in
front of my mouth and a POP FILTER.  It's a simple/cheap screen that
keeps plosive air bursts off the microphone.   I like the Rode N1a for
this but a cheap Chinese mic like that s good now days   For on-camera
recording get a Lavalier microphone.and clip it to your shirt.   No
need to spend a lot of money.  Used AKG brand microphones are
available on eBay.   If shopping don't go to consumer electronics
store.  They sell expensive low quality.  Go to a place that sells to
musicians (Guitar Center or Sam Ash or Sweetwater)  Look for good used
stuff

6) pretty much the way to tell a decent mic from low-end mic is by
looking at the end of the cable.  Any quality microphone will have an
XLR connector.  They is a balanced differential signal

7) the lowest cost Zoom H1 recorder does not have XLR inputs, you have
to move up a little to get that.  But you need it or you will be
dealing with 60Hz hum

8) buy a pair of Sony MDR7506 headphones.  These are the industry
standard for monitoring field recordings.  If the sound seems OK with
these, its good.

9) If you need to get audio into your computer  you need an audio
interface.  of course you can use the Zoom recorder then simply move
the memory card to transfer the sound but if you want to record
directly to the computer you need an interface that (a) accepts XLR
connectors (b) provide "phantom power and (c) does not make much self
noise (hiss)  One good one is the Focusrite 2i2.  Another is Presonus
Audiobox.

OK if you want to go low budget. Just get the entry level "Zoom" and
always keep it as close as possible, just off frame if yu are speaking
on camera and 12" in front of your face if doing voice over in post
production. and do as much of the voice recording after you cut the
video as you can.  Next step up is the lavaliere mic and XLR based
recorder then add a studio condenser mic.   Some times you can hide an
H1 on the set (behind a coffee cup?) to get it even closer

That on-camera mic is for a sync track only, you can trash it later.
on the camera is always the WORST location for a microphone because it
is as far away as possible.

Next is to find a place where you can record that has decent
acoustics.  The no-cost solution might be a walk-in closet in an
upstairs bedroom.  Those studio mics pick up not only your voice but
your voice after it bounces off the walls.   That is one reason you
place it so close (maybe 8" in front of you)   With a dynamic stage
microphone you see the performers always holding it 1 to 3 inches
away, they want their voice to be much louder then all the noise going
on around them.  But a studio mic can be farther back (6 to 12 ")
because studios are quiet places.

As for buying stuff.  Make a plan for an upgrade path so you don't
replace stuff three times.You will find that with videos, the
video camera is the least important and lowest cost item.  It is
LIGHTS and SOUND that is that hard and expensive part.

Next you need software to put it all together.

On Mon, Apr 25, 2016 at 6:14 AM, Jim Craig  wrote:
> All,
>
> I have posted a new video showing the installation process. This video
> goes over downloading the ISO, Making the bootable flash drive, and
> installing the software.
>
> The video is located here: https://www.youtube.com/watch?v=NavAW5-Xx-Y
>
> I know the audio is less than perfect. I am working on a new audio
> recording setup to improve the quality of the recording.
>
> Part of this video was recorded using Simple Screen Recorder. While the
> picture recording worked fine there was some strange audio artifacts in
> the recording. I think I am 

[Emc-users] Learning LinuxCNC Installation Video

[Jim Craig]

All,

I have posted a new video showing the installation process. This video 
goes over downloading the ISO, Making the bootable flash drive, and 
installing the software.

The video is located here: https://www.youtube.com/watch?v=NavAW5-Xx-Y

I know the audio is less than perfect. I am working on a new audio 
recording setup to improve the quality of the recording.

Part of this video was recorded using Simple Screen Recorder. While the 
picture recording worked fine there was some strange audio artifacts in 
the recording. I think I am going to record the audio stream completely 
separate from the video as I have no way to put an external mic on my 
current camcorder.

I have a USB studio condenser mic but I don't think it will record well 
into a linux pc from what I have read. I am contemplating capturing the 
audio into my winders machine.

Let me know what suggestions you have about the audio.

Thanks,

Jim
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