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Author Topic: Mastering audio for Youtube  (Read 3180 times)

Mark Lemaire

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Mastering audio for Youtube
« on: June 20, 2010, 12:58:28 pm »

Folks-

Not sure if this is the right forum for this subject, but here goes:

I am an audio engineer with the job of mixing some material that will be joined with a video and posted on Youtube. The material has many long, sustained notes that YT's compression seems to be mangling badly. The result sounds like old fashioned cassette tape flutter! I am wondering if any of you ME's can advise on a way to avoid this issue? Is there an audio format (or vid format) that Youtube will treat better than the others on it's approved list? Thoughts:

YT now has HD as well as SD playback. We will be finding out whether HD playback improves sound as well as picture. BUT: I am trying to see if this bad audio can be avoided even in SD, which is how many folks will hear it. HD is a format that many viewers are still unaware of, and download time of HD is still an issue for many. How to make it sound right to most folks?

I know that 48k is standard sampling for video since days of old. However, audio for this project was captured at 44.1. The vid editor tells me that it does not matter, and that the 44.1 files I have sent him sound fine- and I'm sure he's right. Still, I wonder what Youtube does with the audio later and whether the 48k standard, in this case, might assist.

I am sure that many of you have had this issue before. Looking forward to your thoughts!
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Mark Lemaire

http://www.myspace.com/MarkLemaire

http://www.rubatorecording.com/
Audiophile recording of your music. Anywhere. Anytime.

ggidluck

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Re: Mastering audio for Youtube
« Reply #1 on: June 22, 2010, 03:50:05 pm »

I was waiting so see if anyone else knew anything about this.

Wikipedia has a table that indicates that the audio encoding for all of the YouTube video resolutions are the same. 44.1kHz, AAC, stereo.

http://en.wikipedia.org/wiki/Youtube (scroll down to the table)

Things you might try...
-dropping the level to -1 or -3 dbfs before encoding.
-experiment with high-pass filtering.
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Gordon Gidluck
http://live2496.com

Mark Lemaire

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Re: Mastering audio for Youtube
« Reply #2 on: June 23, 2010, 02:12:08 am »

Hmmm.

Thanks, but I've already tried those ideas.

Today, I uploaded some vids to YouTube. The sound was FINE. Until 30 minutes later when it did it's usual wiggly thing. What's the story? I wonder if anyone here can assist. Many reads, only one response. Anyone?
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Mark Lemaire

http://www.myspace.com/MarkLemaire

http://www.rubatorecording.com/
Audiophile recording of your music. Anywhere. Anytime.

pmx

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Re: Mastering audio for Youtube
« Reply #3 on: June 23, 2010, 07:05:32 am »

sounds like a playback issue to me, not an encoding one.

if you download the youtube audio with a tool like http://www.listentoyoutube.com/, how does it come out of that?
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Paul Matthijs Lombert | The Mastering Factory

Mark Lemaire

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Re: Mastering audio for Youtube
« Reply #4 on: June 24, 2010, 12:38:50 pm »

Paul-

Thanks for the tip! It is in the playback from YT, as the dowload through the website you mentioned came out without the 'wiggling' problem. Makes me wonder WTF, as other YT playbacks are OK, as far as I can tell.
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Mark Lemaire

http://www.myspace.com/MarkLemaire

http://www.rubatorecording.com/
Audiophile recording of your music. Anywhere. Anytime.
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