John Rofrano
3
COW Coins
Forum Replies Created
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[Paul Godard] “So what should I do in the future to avoid background noise and phase cancellation?”
I would get rid of the “home made XLR to stereo jack“. It seems like that’s what’s causing the problem. Do yourself a favor and pick up a proper Beachtek DXA-2T Universal Compact Camcorder Audio Adapter. This will give you the XLR capabilities you are looking for with none of the nasty phase issues.
As for background noise… mic placement is the most important thing. If you are doing interviews with the mic attached to your camera, get it off of there and on a boom closer to the subject. Nothing fixes background noise better than mic proximity to the source.
~jr
http://www.johnrofrano.com
http://www.vasstsoftware.com -
I’m not sure why you have a phase problem in the first place. This is just dialog. It should be a mono signal. Just change the audio from Stereo to Dual Mono and turn off the second mono channel. Phase problem solved without the need for plug-ins. When you render, FCP X will feed the mono signal into both stereo channels so the final render will be a copy of the mono signal in each stereo channel. I believe this what you are trying to achieve.
[Paul Godard] “I apply a gain of 6 and removed the background noise at 75% (part 3) but the sound quality is now degraded.”
The sound is degraded from too much noise reduction. Sometimes it’s better to use less reduction in multiple passes. I would remove the noise first and increase the gain later but FCP X doesn’t allow you to do this because it’s noise reduction is placed after other plug-ins. You would need to use a 3rd party noise reduction like CrumplePop AudioDenoise, SoundSoap, or iZotope RX DeNoise (all good btw).
[Paul Godard] “And later… but that is not so urgent… how can I avoid the phase issue at the recording with my equipment? What kind of cable or box would solve the problem?”
You’ll need to explain how you are recording to figure that one out. How was this recorded that it turned into a stereo file? One mic? Two mics? Stereo Mic?
~jr
http://www.johnrofrano.com
http://www.vasstsoftware.com -
That test file was a good example. Here is what I did:
I placed Gain before Span so that I can see the effect it will have. In this first shot, Gain is normal and you can see the phase problem:
By swapping the Left channel (or the right but not both) you can see the audio is now in phase again:
You can really head the difference between these two. Hopefully this helps.
~jr
http://www.johnrofrano.com
http://www.vasstsoftware.com -
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Yea, that’s easily overlooked. Thanks for letting us know.
~jr
http://www.johnrofrano.com
http://www.vasstsoftware.com -
[Paul Godard] “The new problem is that the sound is now by far too low to hear, although the meters seem unchanged. “
It sounds like you might be actually causing a phase problem instead of solving it. If I read what you are saying:
(1) The meters show perfect volume
(2) The sounds coming out of the speakers is lowVU meters don’t show phase. They show signal. So you have plenty of signal. But why are your ears not hearing it? (hint: phase cancellation)
What you are describing is the signal canceling itself as it leaves the speakers because it is out of phase which is why your ears perceive it as being low. So I believe you are actually causing phase cancellation while attempting to correct it.
I would use a Phase Meter plug-in to check what the phase of the audio actually is. Don’t guess! You can buy one or download the free Voxengo SPAN plug-in and check the Correlation meter. If the meter shows bars extending from the right the phase is fine. If the meter shows bars extending from the left the audio is out of phase (use the gain filter to correct it).
~jr
http://www.johnrofrano.com
http://www.vasstsoftware.com -
[Jonny Cates] “When you have a finished project and are ready to send it to compressor, can you just use the “I” key and the “O” key to set the range of the project, same as an in and out point? Or do you have to use the range selection tool?”
Yes, you can use the “I” and “O” key to set the range (no need to use the range selection tool) and it will send the entire project to Compressor with the In and Out point set the same way in Compressor. This allows you to actually re-adjust the in and out point after you have sent the project to Compressor.
~jr
http://www.johnrofrano.com
http://www.vasstsoftware.com -
I’ve seen the same with Vegas Pro 12.0 being faster than Vegas Pro 13.0. I don’t know what happened and was hoping Sony would eventually fix it but they never did. I’m also not surprised that Quick Sync was faster because one of the bottlenecks with GPU acceleration is getting the data to and from the CPU to GPU and back so having the GPU on the chip with the CPU is way more efficient. I also never had good results with Sony AVC. I’ve gotten much better results with MainConcept AVC and an equivalent AMD GPU.
~jr
http://www.johnrofrano.com
http://www.vasstsoftware.com -
I’ve never used ffdshow so I can’t help but sometimes with free software… you unfortunately get what you pay for.
You might want to download a trial of the excellent PicVideo MJPEG codec. It’s not free but I’m guessing it might give you consistent results every time.
~jr
http://www.johnrofrano.com
http://www.vasstsoftware.com -
Quad-channel RAM does benchmark faster. I had it in my Hex Core workstation. I have triple channel in my 2010 Mac Pro and when I dropped it to dual channel it did benchmark slower so I switched it back. Anything that uses a lot of memory like photo editing or for 4K video will probably benefit in real life. Whether you will notice or not I haven’t actually measured. In the grand scheme of things, the speed of your RAM is usually not the bottleneck when processing heavy video FX.
~jr
http://www.johnrofrano.com
http://www.vasstsoftware.com
